248 RECENT OPHIURANS. 



This interesting amphiuran is nearly related apparently to Amphiodia chi- 

 lensis (MuUer & Troschel) but differs from that species in many ways ; the disk- 

 scaling is coarser, the radial shields are longer and narrower, and the oral papillae 

 and tentacle-scales are conspicuously larger; moreover the upper and lower arm- 

 spines are more or less terete and pointed instead of being thick and truncate 

 as all three spines are in chilensis. None of the Amphiodias collected by the 

 SiBOGA in the East Indies approach very nearly to this Torres Strait form but 

 Brock collected at Amboina, and Semon at Thursday Island, species which are 

 closely related. From Brock's ochroleuca, the scaling of the disk and the form 

 of the upper arm-plates distinguish mesopoma, while the same characters and the 

 color serve to separate the latter from the Thursday Island species, hrocki 

 Doderlein. It is of course possible that a large series of East Indian specimens 

 might show that the characters mentioned are matters of individual diversity, 

 but in the absence of material we have no right to assume this, and I therefore 

 keep the three species separate. 



637. O. OCCIDENTALIS (Lvman). 



Amphiura occidentalis Lyman, 1860. Proc. Boston soc. nat. hist., 7, p. 194. 1865. Illus. cat. 



M. C. Z., no. 1, p. 130, f. 12, 13. 

 Amphiodia occidentalis Verkill, 1899. Trans. Conn, acad., 10, p. 313. 



40 specimens, including 2 cotypes. Gulf of Georgia. Washington : Puget 

 Sound, Ballard. California^: Mendocino; San Francisco Bay, off Angel 

 Island, 8J-12I fms. ; off Goat Island, 8|-11 fms.; southwest of Farallones Light, 

 60-68 fms.; Monterey. 



638. A. PARTITA (Koehler). 



Amphiura partita Koehler, 1897. Ann. sci. nat. Zool., ser. 8, 4, p. 336, pi. 7, t. 50, 51. 



3 specimens. Northwest of Bombay, India, 411-556 fms. 



639. A. PERIERCTAH.L. Clark, 1911. Bull. 75 U. S. N. M., p. 160, f. 68. 



1 PARATYPE. Off Oregon, 30 fms. 



640. A. PLANISPINA (VON Martens). Plate 8, f. 8, 9. 

 Amphiura planispina von Martens, 1867. Monatsb. K-Preuss. akad. wiss. Berlin, p. 347. 

 Amphiodia planispina Verrill, 1899. Trans. Conn, acad., 10, p. 313. 



3 specimens, including 2 COTYPES. Brazil: Rio Janeiro; Porto Seguro. 



641. A. PSILOCHORA H.L.Clark, 1911. Bull. 75 U. S. N. M., p. 165, f. 72. 



3 PARA TYPES. Japan: Sagami Sea, 292-622 fms. 



> Without definite locality. 



