1923] Clark, Echinoderms from Lower California 149 



Station 5692. Off Pt. San Tomas, west coast of Lower California, 

 1076 fms. Bottom temp. 37.1°. 



One specimen. 



Owing to the locality and the fact that there was only a single small 

 broken specimen, I was inclined to list this comatulid as Thaumatometra 

 parvula (Hartlaub), in spite of the obviously different cirri, but Mr. 

 Austin H. Clark suggested to me that the arms were evidently the arms 

 of a Trichometra and the combination of characters shown by the cirri, 

 pinnules, and arms clearly indicated an undescribed species. Oddly 

 enough, the species most closely resembling this new one from the 

 eastern Pacific is the little Trichometra minutissima A. H. Clark, from 

 off the Brazilian coast in 818 fms. But the Atlantic species has a very 

 different centro-dorsal, far more numerous cirri, much rougher costals 

 and somewhat more slender pinnules. For convenience in comparing 

 the two species, I have modeled my description of europacifica after the 

 pattern of the original description of minutissima (1908, Proc. U. S. 

 Nat. Mus., XXXIV, p. 233). 



ASTEROIDEA 



Astropecten erinaceus Gray 

 Astropecten erinaceus Gkay, 1840, Mag. Nat. Hist., (new series), VI, p. 182. 

 The present specimens are large, R = 80 and 125 mm., and are 

 conspicuously spiny. The color is the usual yellow-brown of dry sea- 

 stars. In the larger specimen, r and br each = 28 mm. and hence R = 

 4.5 r. 



Conception Bay, east coast of Lower California. 

 Two specimens. 



Thrissacanthias penicillatus (Fisher) 



Persephonaster penicillatus Fisher, 1905, Bull. U. S. Bur. Fish., XXIV, p. 297. 

 Thrissacanthias penicillatus Fisher, 1910, Ann. Mag. Nat. Hist., (8) V, p. 171. 



These specimens are large adults, ranging from R=100 mm. to 

 R = 22o mm., and call for no special comment. They are merely addi- 

 tional specimens from four stations previously recorded, namely Sta- 

 tions 5694, 5697, 5698, and 5699. 



Thirteen specimens. 



Pectinaster agassizii (Ludwig) 

 Cheiraster agassizii Ludwig, 1905, Mem. Mus. Comp. Zool., XXXII, p. 1. 

 Pectinaster agassizii Ludwig, 1910, Sitz. K. Preuss. Akad. Wiss., XXIII, p. 449. 



These specimens range in length of R from 15 to 55 mm. They 

 are in part from Stations 5689 and 5692, whence they were previously 



