History of British animals - University of Guam Marine Laboratory

PoTEitiocRiNiTEs. RADIATA. CRINOIDiE. 4955. P. Briaereus.— Auxiliary side-arms angular,in a single series ; columnsmooth. Mill. Crin. 56—In Lias.Gen. POTERIQCRINITES.—Pelvis of five joints, with fivecostals ;fingers of a single series of joints ; column not enlarging,round ;central canal round ;articulating surfaceof the jointsradiated ;auxiliaryside-arms round.1. P. crassus—Joints of the fingers thick ; plates of the pelvis articulatingby transverse ridge-like processes.— Mill. Crin. 03.— Carboniferous Limestone.2. P. tenuis—Joints of the fingers slender ; plates articulating by minuteMill. Crin. 71.— Carboniferous Limestone.strioe.Gen. CYATHOCRINITES.—Pelvis of five plates, with fivecostals ; the fingersof a single series of joints ;column notenlarged ; articulating surface of the columnar joints radiated; auxiliary side-arms round, and placed irregularly.1. C. planus—Column and central canal round ; plates smooth Mill. Crin.85.—In Carboniferous Limestone.2. C. tuberculatus.—Column and central canal round ; costal plates tuberculatedMill. Crin. 88— Carboniferous Limestone.3. C. rugosus.—Column round ; central canal petal-shaped ; costal plateswith angular ruggedstriae.—Mill. Crin. 89.— Carboniferous Limestone.4. C. quinquangularis —Column and central canal pentangular ; costal platessmooth.—Mill. Crin. 92 Carboniferous Limestone.Gen. ACTINOCRINITES—Pelvis formed of three plates,with five costals and one intercostal ;fingers of two series ofjoints ; column and canal round, the articulating surfacesradiated ; auxiliary side-arms round and irregular.1. A. triacontadactylus.— Thirty fingers proceeding from five scapulae.— Mill.Crin. 95.— Carboniferous Limestone.2. Polydactylus.—More than thirty fingers proceeding from five scapulae.—Mill. Crin. 103.— Carboniferous Limestone.Gen. RHODOCRINITES—Pelvis of three plates, with fivecostals and five intercostals ; fingers of two series of joints ;column not enlarging, round, the canal petal-shaped.1. It. verus.— Auxiliary side-arms round and irregular*— Mill. Crin. IOC—Carboniferous Limestone.