Report on the zoological collections made in the Indo-Pacific Ocean ...

66 COLLECTIONS FROM MELANESIA.68. Cerithium torresi. (Plate V. fig. 0.)Shell elongate-pyramidal, white, blackish towards the apex,ornamented with transverse series of dark-brown dots upon thelira) between the longitudinal granose costte. Whorls 11, veryslightly convex, separated by a deej^ish suture, costate and transverselylirate, the points of intersection of the ribs and ridges beingdeveloped into prominent white nodules. The spiral lirai whichbecome nodulous are three in number in the upper whorls, theuppermost being situated close to the suture, the next a little abovethe middle, and the lowermost below it, but more remote from thesuture than the uppermost. In addition, there are one or moresimple thread-like lines revolving between the granulous ridges,which arc also articulated with brown. The body-whorl has abouteight principal transverse ridges, of which the three uppermost arethe thickest, the two next rather finer and also granulous, thethree remaining ones being still more slender and more feeblynodulous. The longitudinal ribs are about twelve on a whorl, oneof them being swollen or varicose. The last varix on the bodywhorlis situated on the left of the aperture ; this is small, obliquelyoval, terminating anteriorly in a short, oblique, and ver)^ slightlyrecurved canal. The columella is considerably arched, white,covered with a thin callosity, developed at the upper part into anelongate ridge which runs within the aperture. Labrum varixedexternally, also thickened a little within and shallowly grooved,the grooves corresponding with the external ridges. Length l-ikmillim., diam. 5 ; aperture 4| long and 2| wide.Hab. Prince of Wales Channel, Torres Straits, 3-4 fms.69. Cerithium (Colina) macrostoma.Cerithium macrsotoma, Hinds, Voi/. 'Sulphur,' p. 27, pi. xvi. figs. 11,12 ; Stnoerhy, Thes. Conch, pi. 184. fig. 219 ; id. Conch. Icon, figs.U8a,b.Var. = Colina pupiformis, A. Ada7ns, Proc. Zool. Sac. 1853, p. 17G,pi. XX. tig. 14 (enlarged).= Cerithium pupEeforme (A. Adams), Sowerhy, Thes. Conch.vol. ii. pi. 184. fig. 221 ; id. Conch. Icon. figs. 122 a, h (bad !).Var. = Colina costata, A. Admns, P. Z. S. 1854, p. 86.= Cerithium costiferum, Sotcerby, Thes. Conch, vol. ii. pi. 184.figs. 222; id. Conch. Icon. figs. 117 «, b.Var. = Colina pygmaea, H, Adams, P)-oc. Zool. Soc. 1867, p. 308,pi. 19. fig. 19.Ilab. Thursday Island, Torres Straits, 5-7 fms. {Coppinrn'r) :Straits of Macassar, 11 fms, (Hinds); Damaguete, PhilippineIslands (Cuminf/ for C. pupifonnis) ; Philippine Islands {Cumingfor C. costata) ; Borneo (//. Adams for C. pygmcea).The above-named and so-called species I believe to be merevariations of one and the same shell. Compare the extreme forms(C. macrostoma and C. pygmcea), and one perceives a vast differencein outline and the number of whorls ; but even here several featuresin common will be fgund, namely the spotted expanded outer lip,