6L Ef"HrN(JDERMA OF THE INDIAN MiTSBUM, PART VII. 



fourth brachiale are united by syzygy ; stem stout, pentagonal, or more 

 or less stellate ; the pinnules continue to the arm tips ; cirrus segments 

 smooth. 



ENDOXOCKINUS, p. 263. 



c' IBr series of two ossicles, but the further division as in the comasterid 

 genus Capillaster, more rarely as in Comatella; the first brachial of 

 the free undivided arm, unless springing from a IBr axillary, bears a 

 pinnule, and the second and third are united by syzygy; stem slender, 

 nearly circular in section ; the arm tips for a considerable distance bear 

 only rudimentary pinnules, as in Metacrinus; the distal cirrus segments 

 bear small dorsal spines. 



COMASTROCRINUS, p. 252. . 



■2i. — Key to the Genera of Apiocrinid^. 



a' Pentagonal columnars in proximal jjortion of stem without markings on the 



articular faces ; no nodals or cirri ; elements of the IBr series narrow and 



widely separated. 



carpenterocrinus, p. 272 



a^ pentagonal columnars in proximal poi'tion of stem with petaloid markings on 



the articular faces ; proximal portion of stem with regularly spaced nodals 



bearing short cirri ; elements of the IBr series very broad and in lateral 



apposition. 



PROISOCRINUS, p. 272. 



25. — Key to the Genera of Hyocrinid.^. 

 a' Five basals ; the arms branch several times. 



CALAMOCRINUS, ]). 272. 



a* three basals, sometimes completely fused; the arms do not branch. 



b' each brachial, except the most jiroximai, bears a pinnule; syzygies very 

 infrequent ; pinnules not especially long. 



PTILOCRINUS, p. 272. 



b^ one lialf or fewer of the bracliials bear pinnules ; brachials united in 

 syzygial groups of two or three; pinnules extremely long, reaching to the 

 arm tips. 



c' brachials united in syzygial groups of three. 



HY'OCRINUS, p. 273. 



c* brachials united in syzygial pairs. 



d' upper part of stem hexagonal ; first brachial occupying only aljout one 

 third of the distal border of the radial. 



THALASSOCRINUS, p. 273. 



