RECENT OPHIURANS. 285 



larger one in each interradius. The knobs on the upper arm-plates are con- 

 spicuous. In proportion to its size, this species, compared with the other 

 members of the genus, is notably stout or thick-set (hence the name). Color 

 (dried from formalin) : —disk nearly white with several pale rose-colored blotches ; 

 arms irregularly banded with dull gray and reddish. 



HoLOTYPE (M. C. Z. 3831). Torres Strait: Murray Islands, Mer, off west 

 reef, 18 fms., on a sponge. Oct. 13, 1913. Carnegie Exp. 1913. H. L. Clark Coll. 



The general appearance of this species is quite different from that of any 

 other Ophiothela in the collection, the arms being so much shorter and thicker; 

 but unfortunately I have had no specimens of verrilli for comparison. I think, 

 however, there can be Uttle doubt that this specimen is not that species, so it 

 has seemed desirable to give it a name. The genus is a perplexing one on account 

 of the small size and pecuUar structural modifications. None of them exist 

 in museums in adequate numbers for satisfactory study, but, contrary to Doder- 

 lein, I see no reason to doubt that tlixjse hitherto described are perfectly valid. 

 The specunen of hadra figured on Plate 14 was taken by the AustraUan F. I. S. 

 Endeavour off the east coast of Australia. 



947. O. ISIDICOLA Lutken, 1872. Ov. KongI, Danske vid. selsk. Forh., p, 92, 107, pi. 2, f. ia-Af. 



23 specimens. Philippine Islands. 



948. O. MIRABILIS Verrill, 1867. Trans. Conn, acad., 1, p. 268. 



6 coTYPES. Panama: Pearl Island. 



949. 0. TIGRIS Ltman, 1871. lUus. cat. M. C. Z., no. 6, p. 10, pi. 1, f. 10-12. 



HoLOTTPE and 1 paratype. Loc? 



950. O. VINCULA Mortensen, 1913. Steenstrup's Mindeskrift, no. 10, p. 14, pi. 1, f. 11-13. 



1 cotype. Philippine Islands: San Bernadino Strait, 50-100 fms. 

 Species of Ophiothela not represented in the M. C. Z. 



951. O. VERRILLI Duncan, 1879. Journ. Linn. soc. Zool., 14, p. 477, pi. 11, f. 33. Korean Seas. 



Ophiopsammixtm. 



Lyman, 1874. Bull. M. C. Z., 3, p. 231. 

 Type-species: Ophiopsammium semperi Lyman, 1874. op. cit., p. 232. Monotypic when established. 



952. O. SEMPERI Lyman, 1874. BuU. M. C. Z., 3, p. 232, pi. 4, f. 11-17. 



Holotype and 10 paratypes. Philippine Islands, 10 fms. 



