NO. 15 RECENT CRINOIDS IN BRITISH MUSEUM — CLARK 6j 



It is easily distinguished from the allied forms by the small size of 

 the first and the large size of the second brachial, the latter being 

 nearly or quite twice as large as the former. In Th. naresi the first 

 three brachials are all of about the same size. Th. borealis is larger 

 and more rugged than Th. naresi. 



THAUMATOCRINUS RENOVATUS (P. H. Carpenter) 



Thaumatocrinus renovatus 1884. P. H. Carpenter, Phil. Trans. Roy. Soc, 



1883, p. 919. 

 Promachocrinus abyssorum 1888. P. H. Carpenter, " Challenger " Report, 



Comatulae, p. 351 (1, 2). 



1. " Challenger" Station No. 14/. — Two specimens. 



2. " Challenger " Station No. 158. — One specimen. 

 Remarks. — This is a small and delicate species. 



Genus PENTAMETROCRINUS A. H. Clark 

 PENTAMETROCRINUS JAPONICUS (P. H. Carpenter) 



Eudiocrinus japonicus 1882. P. H. Carpenter, Journ. Linn. Soc. (Zool.), 

 vol. 16, p. 499 ( 1 ) . — 1888. P. H. Carpenter, " Challenger " Report, Co- 

 matulae, p. 84 (1). 



I. "Challenger" Station No. 235. — Three specimens; these re- 

 semble the medium-sized specimens which I recorded from Japan. 



PENTAMETROCRINUS SEMPERI (P. H. Carpenter) 



Eudiocrinus semperi 1882. P. H. Carpenter, Journ. Linn. Soc. (Zool.), vol. 

 16, p. 497 (1). — 1888. P. H. Carpenter, " Challenger" Report, Comatu- 

 lae, p. 82 (1). 



I. "Challenger" Station No. 169. — Two specimens; the disk is 

 covered with a very close and abundant fine plating. 



PENTAMETROCRINUS VARIANS (P. H. Carpenter) 



Eudiocrinus varians 1882. P. H. Carpenter, Journ. Linn. Soc. (Zool.), 

 vol. 16, p. 496 (1). — 1888. P. H. Carpenter, "Challenger" Report, Co- 

 matulae, p. 81 (1). 



i. "Challenger" Station No. 205. — Two specimens; these re- 

 semble the larger specimens which I have recorded from Japan and 

 from the Indian Ocean. 



