206 



ECHINODERMATA— PELMATOZOA 



PHYLÜM IV 



Taxocrinus interviedius 

 W. and Sp., showing 

 tegmen, Avith ambnlacra, 

 oraLs and open mouth be- 

 tween them (after Wachs- 

 muth and Springer). 



Taxocrinus Phillips {Isocrinus Phill., 7ion von Meyer; Cladocrinus Austin 7ion 

 Ang. ; Euryalecrinus Austin). (Figs. 306, 307.) Like Eutaxocrinus, but with 



primibrachs three. De- 



vonian to summit of 



Lower Carboniferous ; 



England, Belgium and 



North America. 



Parichthyocrinus 



Springer. No BA. iBr 



few. IBr three. Eays 



closely abutting above 



iBr; arms interlocking 



and infolding distally. 



Has the habitus of 



Ichthyocrinus, but with 

 the tube-like anal series of the Taxocrinidae 

 well developed. Lower Carboniferous ; 

 Upper Burlington and Keokuk ; (?) Goal 

 Measures ; Mississippian area. North Amer- 

 ica. Type, Ichthyocrinus nobilis (W. and Sp.). 

 Onychocrinus Lyon and Cass. {Oligocrinus 

 Springer). Arms heterotomous. Rays 

 widely divergent, produced into ten large, 

 rounded main trunks, bearing ramules. No 

 EA. iBr few or numerous. IBr three to 

 six, or more. Lower Carboniferous (Lower 

 Burlington to Kaskaskia) ; Mississippian 

 area, North America. 



This is the culmination and most ex- 

 travagant development of the Taxocrinoid 

 type. With the exception of an imperfectly known species, probably of 

 this family, from the Lower Coal Measures, this and a depauperate species 

 of Taxocrinus are the last survivors of the Flexibilia. 



Fig. 307. 



Taxocrinus colletti White. Perfect crown. 

 Lower Carboniferous ; Crawfordsville, Ind. 

 Usually known in collections as T. meeki, or 

 T. multibracMahis (F. Si)ringer, original). 



Incertae sedis. 



Edriocrinus Hall. Superficially resembles Holopus, and its position is 

 doubtful. Has broad branching arms, with shallow ventral groove, short 

 brachials, and no pinnules. No stem ; basals fused into a rounded conical 

 mass, attached by a flattened surface when young, free in the adult. Radiais 

 five, with anal plate in same ränge. Lower Devonian (Helderbergian, 

 Oriskany) ; New York, Maryland, Tennessee. 



Caleidocrinus Waagen and Jahn. Probably an Inadunate Crinoid, with 

 anal side not difFerentiated in dorsal cup. Silurian ; Bohemia. 



Bhopalocrinus W. and Sp. Founded on a unique specimen described as 

 Taxocrinus gracilis Schnitze, but does not belong to this group. It has a 

 strongly plated anal tube reaching to height of the arms, and might be 

 described as a dicyclic Synbathocrinoid, wdth some interbrachial plates. 

 Middle Devonian ; Eifel. 



