1913.] Clark, Echinoderms from Lower California. 193 



Pseudarchaster pusillus. 



Fisher, 1905. Bull. Bur. Fish., Vol. 24, p. 304. 



There is a very good series of this species, ranging from R = : 14 mm. to 

 R = 40 mm. They show very little variation among themselves but the 

 paxillse spinelets and the spines of the marginal plates and actinal surface 

 are all so slender and so well spaced that the general facies is different from 

 typical pusillus and at the opposite extreme from the form described and 

 figured by Fisher from off San Diego, 'Albatross' St. 4367. But there is 

 little reason to doubt the identity of the specimens for they do not approach 

 the Panamic forms described by Ludwig. 



Station 5675. Southwest of San Cristobal Bay, west coast of Lower 

 California, 284 fms. Bottom Temp., 44.6. Thirty specimens. 



Ceramaster leptoceramus. 



Tosia leptocerama FISHER, 1905. Bull. Bur. Fish , Vol. 24, p. 306. 

 Ceramaster leptoceramus FISHER, 1911. Bull. U. S. Nat. Mus., No. 76, p. 210. 



Neither of the two specimens before me is adult. In the larger R == 35 

 mm.; in the smaller R = 26 mm. Few of the adambulacral plates in 

 either specimen have more than six furrow spines. The range of the species 

 is extended southward some distance, by its occurrence at the following 

 station. 



Station 5675. Southwest of San Cristobal Bay, west coast of Lower 

 California, 284 fms. Bottom Temp., 44.6. Two specimens. 



Ceramaster patagonicus. 



Pentagonaster patagonicus SLADEN, 1889. 'Challenger' Asteroids, p. 269. 

 Ceramaster patagonicus FISHER, 1911. Bull. U. S. Nat. Mus., No. 76, p. 214. 



A pentagonal starfish with conspicuous marginal plates and having 

 R = 30 mm. seems to belong to this species as described and figured by 

 Fisher. I am inclined to think that more abundant material will show that 

 the north Pacific specimens are not conspecific with patagonicus. 



Station 5682. Off Cape St. Lucas, Lower California, 491 fms. Bottom 

 Temp., 40.8. 



