CLASSjii CEINOIDEA 221 



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

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

 England. 



Streptocrinus W. and Sp. {Ophiocrinus Ang. uon 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. 



Lecythocrinus Joh. Müller {Taxocrinus briareus 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. 



Lophocrinus Meyer (Carduocrinus Koenen). Onlv 

 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. Radial 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 LecythocnZeman...Mnn. 

 cup, which has the same elements as the preceding. Devonian; Eifei. Restored 

 Arm facets directed upward, without dorsal canal. 



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

 America. • 



Family 10. Botryocrinidae Batlier. 



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

 crals, extended posteriorly into a ventral sac. Radianal oblique, not touching basals, 

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

 varying from ramuliferous to complete pinnulation. Articulation of first brachial an 

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

 and Devonian. 



Botryocrinus Angelin (Sicyocrinus Ang.). EA 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 irregulär dichotomy. 

 Stem with whorls of cirri. Lower Devonian ; Germany. 



Cosmocrinus Jaekel (Cyathocrinus ornatissimus Hall). EA 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 regulär piiuiules. Radial facets rather wide. 

 Devonian (Portage) ; New York. 



