1923] Clark, Echinoderms from Lower California 157 



the arms, with yellow-brown and cream-color. Accompanying this 

 specimen is a slip on which is written: "Lower California on oyster 

 shells. No locality label." Only a single specimen of sethiops was in the 

 original collection and that was from Angel de la Guardia Island in the 

 Gulf of California. 



Ophiocoma alexandri Lyman 



Ophiocoma alexandri Lyman, 1S60, Proc. Boston Soc. Nat. Hist., VII, p. 256. 



A young specimen of this species, 4 mm. across the disk and yellow- 

 brown in color, is very finely preserved, but, like the young sethiops, 

 it is accompanied by a slip reading " Lower California. No locality label. 

 On oyster shells." 



Ophiothrix spiculata Le Conte 



Ophiothrix spiculata Le Conte, 1851, Proc. Acad. Nat. Sci. Philadelphia, V, p. 

 318. 



There are 30 very badly preserved small specimens of this common 

 Panamic brittle-star with the disk 2 to 7 mm. across. They bear a label 

 "D 5695" but this locality is obviously wrong, as the depth at Station 

 5695 was 534 fms. and spiculata is essentially a littoral species. It has 

 been recorded from depths near the 100 fms. line, but that is extreme. 

 The label with the specimens bears the date April 26, 1911 and the speci- 

 mens themselves indicate that they were taken in very shallow water. 



Astroschema sublaeve Liitken and Mortensen 

 Astroschema subheve Lutken and Mortensen, 1899, Mem. Mus. Comp. Zool., 

 XXIII, p. 187. 



There are two more specimens from Station 5695, one an adult with 

 disk 13 mm. across and arms fully 200 mm. long, but only 3 mm. in 

 diameter; the other very young, with disk smooth, only 2 mm. across 

 and arms so tightly coiled on the gorgonian, on which both it and the 

 adult are borne, that they cannot be measured. 



Asteronyx excavata Lutken and Mortensen 

 Asteronyx excavata Lutken and Mortensen, 1899, Mem. Mus. Comp. Zool... 

 XXIII, p. 185. 



There is a single additional specimen, 22 mm. across the disk, on a 

 gorgonian from Station 5688. 



ECHINOIDEA 

 Eucidaris thouarsii (Agassiz and Desor) 

 Cidaris thouarsii Agassiz and Desor, 1846, Ann. Sci. Nat., VI, p. 326. 

 Eucidaris thouarsii Doderlein, 1887, 'Jap. Seeigel,' p. 42. 



