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like base referred to Primocandelabrum hiemaloranumn. gen. and sp., bush-like fossils toParviscopa bonavistensis n. gen. and sp., ladderlikefossils to Hadryniscala avalonica n. gen.and sp., and string-like fossils with basal disc toHadrynichorde catalinensis n. gen. and sp. Theremains also include dubiofossils. The stratigraphicranges of some taxa on the BonavistaPeninsula are longer than previously reportedfrom the Avalon Peninsula, with Fractofususspindles present in the Trepassey Formation,Bradgatia, Charnia, Charniodiscus, andIvesheadia reaching as high as the FermeuseFormation, and Aspidella extending into themiddle of the Renews Head Formation. Thespindles in the Trepassey Formation are comparableto those found mainly in the stratigraphicallyolder Briscal Formation on the AvalonPeninsula.2008040406缨 鳃 虫 ( 环 节 动 物 , 多 毛 纲 ) 管 状 物 的 超 微结 构 及 钙 化 的 起 源 = On the tube ultrastructureand origin of calcification in Sabellids (Annelida,Polychaeta). ( 英 文 ). Vinn O; Hove T; Mutvei.Palaeontology, 2008, 51(2): 295-301Tube ultrastructure of Jurassic and CretaceousGlomerula is very similar to that of Recent Calcisabella,supporting the synonymy of these generaand the early Mesozoic origin of calcificationin sabellids. Tube structure of serpulids differsfrom that of Glomerula; calcareous tubes probablyevolved convergently within Sabellida. Thetube wall in Recent Glomerula piloseta is composedof subparallel lamellae of aragonitic, irregularspherulitic prisms in the inner layer, andspherulites in the outer layer. Calcified lamellaeare separated by organic films of different thickness.The structure of the internal tube layer inGlomerula piloseta, and the structure of entirewall in fossil Glomerula, are similar to the tubestructure of Dodecaceria (Polychaeta, Cirratulidae).The irregular spherulitic prisms of Glomerulaare similar to those found in the externallayer of Hydroides dianthus and the internallayer of Spiraserpula caribensis.2008040407华 北 早 新 元 古 代 蠕 虫 状 碳 质 压 型 化 石Protoarenicola, Pararenicola 和Sinosabellidites 的 重 新 研 究 = Restudy of theworm-like carbonaceous compression fossilsProtoarenicola, Pararenicola, and Sinosabelliditesfrom early Neoproterozoic successions inNorth China. ( 英 文 ). Dong Lin; Xiao Shuhai;Shen Bing; Yuan Xunlai; Yan Xianqin; PengYongbo. Palaeogeography PalaeoclimatologyPalaeoecology, 2008, 258(3): 138-161The carbonaceous compression fossils Protoarenicolabaiguashanensis Wang, 1982,Pararenicola huaiyuanensis Wang, 1982, andSinosabellidites huainanensis Zheng, 1980, fromthe early Neoproterozoic Liulaobei and Jiuliqiaoformations in northern Anhui, North China, werepreviously interpreted as worm-like metazoans,largely on the basis of transverse annulations andpurported proboscis structures. If correct, thesewould be some of the earliest known bilateriananimals and would provide a key paleontologicalcalibration to molecular clock analyses. In thisstudy, we examine a large population of thesecarbonaceous fossils, clarify their taxonomy, andprovide new insights into their morphological,paleoecological, and phylogenetic interpretations.Although all three species are characterizedby annulated tubes, P. baiguashanensis bears abulbous terminal structure at one end of its tube.P. huaiyuanensis is characterized by a constrictedopening at one end and a closed terminationat the other. The two ends of S. huainanensistubes are both closed and round. The bulbousterminal structure in P. baiguashanensis waspreviously interpreted as an animal proboscis,but new observations suggest that it was morelikely a holdfast structure analogous to discoidalholdfast structures of the MesoproterozoicTawuia-like fossil Radhakrishnania Kumar,2001, and the frondose Ediacara fossil CharniodiscusFord, 1958. Furthermore, it is possiblethat at least P. baiguashanensis and P. huaiyuanensismay represent reproductive or taphonomicfragments of the same organism. Thisreinterpretation weakens the previous interpretationthat P. baiguashanensis and P. huaiyuanensiswere worm-like bilaterian animals. Instead,they can be alternatively interpreted as erectepibenthic organisms, possibly coenocytic algaereaching a tiering height of 30 mm. The predominanceof discoidal holdfasts, as opposed torhizoidal holdfasts, in pre-Ediacaran epibenthicorganisms was probably related to more stablesubstrates in the presence of microbial mats andin the absence of bioturbating animals.2008040408云 南 早 寒 武 世 Palaeoscolecids 新 记 录 = NewRecord of Palaeoscolecids from the Early Cambrianof Yunnan,China. ( 英 文 ). Hu Shixue; LiYong; Luo Huilin; Fu Xiaoping; You Ting; PangJiyuan; Liu Qi; Stetner M. Acta GeologicaSinica, 2008, 82(2): 244-248A new palaeoscolecid,Guanduscolex minorHu,Luo et Fu gen.et sp.nov.,with preserved softparts of introvert and intestines comes from theLower Cambrian Guanshan fauna of Yunnan,South China.Microstructural details of the cuticlerevealed by scanning electron microscopy(SEM)show that each annulation bears126