252 ECJIINODERMA OF THK INDIAN MuSEUM, TART VII. 



(Jenus ATELECRINUS. 



Atehcritms 1881. P. H. Carpenter, Bull. Mus. Comp. Zool., vol. 9, No. 4, 

 p. ICO (Atelecrinus balanoid.es, sp. nov.). 



ATELECRINUS CONIFER. 



Atelecrinus conifer 1908. A. H. Cl.^rk, Proc. U. 8. Nat. Mus., vol. 34, p. 214. 

 Habitat.— Hawaiian Islands. 

 Depth. — 552-809 fathoms. 



ATELECRINUS WYVILLII. 



Atelecrimis wyvUlii 1882. P. H. Carpenter, Joiun. Linn. Soc. (Zoiil.), vol. 16, 

 p. 492. 



Habitat. — Near Fiji. 

 Depth. — CIO fathoms. 



II.— THE STALKED CRINOIDS. 



Family PENTACRINITID^. 



Pentacrinitkhr 1842. J. E. Gray. Synopsis Brit. Mus., p. ny.— l,s48. List Brit. 

 Animals in Brit. Mus., Cent ronia' or Radiated Animals, p. 28. 



Genus COMASTROCRINUS, nov. 



Genotype. — Hypalocrinus sprinycri A. H. Clark, 1909. 



Diagnosis. — A genus of Pentacrinitid;ie in which the arms are more than ten 

 in number, the division being by defective interpolated division as in Capillaster, 

 by compound division as in Comatella, or by a combination of the two, but never 

 by simple extraneous division as in Metacrinus, simple interpolated division as in 

 Hypalocrinus, multiplex interpolated division as in Endoxocrinns, or interpolated- 

 extraneous division as in Isucrinus or Peniacriniles. Following division series of 

 two the first syzygy on the outer arms is between the second and third brachials, 

 on the inner arms between the third and fourth brachials (just the reverse of the 

 conditions found in Comatella) ; in the former ease the first pinnule is on the first 

 brachial, in the latter it is on the second ; following division series of more than 

 two ossicles the first syzygy is between the second and third brachials as in 

 Capillaster. The articulation between the ossicles of the IBr series is a pseudo- 

 syzygy, of the type common to all the genera of the Pentacrinitida?. All the 

 proximal ossicles beyond the radials hav<- the distal edges everted and strongly 

 produced, this giving the species of this genus a very striking and characteristic 

 appearance. The distal portion of the arms, as in Metacrinus and Hypalocrinus. 



