CLASS III 



CRINOIDEA 221 



but with longer arms and anal tube, which is more like that of the Poterio- 

 crinidae, probably with lateral opening. Stem quinquepartite. Silurian ; 

 England. 



Strepfocrinus W. and Sp. {Ophiocrinus Ang. non Salter). Calyx like that of 

 Cyathocrinus. Anal tube coiled, opening probably at the side. Arms branching, 

 coiled inward, with peculiar processes called " false pinnules." Not well 

 understood. Silurian ; Gotland. 



Leajthocrinus Joh. Midler {Taxocrimis hriareus Schultze) {Fig. 320). Arms 

 branching repeatedly. Anal tube long, with strong 

 plates in longitudinal columns. Stem subquadrangular, 

 with central and four peripheral canals. Infrabasals 

 small, unknown, may be undivided. Middle Devonian ; 

 Eifel. 



Lophocrimis Meyer {Carduocrinus Koenen). Only 

 one arm to the ray, with small ramuli alternating from 

 every second brachial. Anal tube of delicate plates. 

 Upper Carboniferous ; Germany. 



Codiacrinus Schultze. No anal plate in dorsal cup. 

 Infrabasals three. Eadial facets directed obliquely 

 outward, and with a separate dorsal canal. Arms 

 dichotomous, short and slightly developed. Calyx 

 obconical, expanding ,upward. Middle Devonian ; Eifel. ^^^, ^^^ 



Lecythiocrinus White. Known only from the dorsal i,,y,hncrivuseiMutnu.Mm. 

 CUD, which has the same elements as the preceding. Pfy'iiian ; Eifei. Restored 



1' i-i 11 1 (after hclmltze). 



Arm facets directed upward, Avithout dorsal canal. 



Calyx bursiform, contracting at the arm bases. Upper Carboniferous ; North 



America. 



Family 10. Botryocrinidae Bather. 



Dicydic. Tegmen composed of irregular plates without definite orals or amhula- 

 crals, extended posteriorly into a ventral sac. Badianal oblique, not touching h'asals, 

 variable in size. Anal x in line with radials. Arms usually heterotomous, hut 

 varying from ramuUferous to complete pinnulation. Articulation of first brae] da I on 

 radial imperfect, facets usually shallow, curved, not as wide as the radial. Silurian 

 and Devonian. 



Botryocrinus Angelin (Sicyocrinus Aug.). BA small, quadrangular. Ventral 

 sac large, sometimes coiled, with anus below the coil. Arms heterotomous, 

 with two main rami bearing ramules which in some species reach the state of 

 pinnulation. Silurian and Devonian ; Gotland, England and North America. 



Bhadinocrinus Jaekel. Calyx small, with very long ventral sac. Arms 

 relatively long and heavy, with ten main rami, bearing very small, branching 

 ramules at long intervals. Lower Devonian ; Germany. 



Gastrocrinus Jaekel. Similar small calyx, with shorter sac, having longi- 

 tudinal columns of projecting plates. Arms long, with irregular dichotomy. 

 Stem with whorls of cirri. Lower Devonian ; Germany. 



Cosmocrinus Jaekel (Cyathocrinus ornatissimus Hall). BA large. Ventral 

 sac very large, reaching as high as the arms. Arms heterotomous, with ten 

 main trunks having several branches nearly as large, toward the inside of the 

 dichotom, which in turn bear regular pinnules. Radial facets rather wide. 

 Devonian (Portage) ; New York. 



