434 ECHINOMETKA SUBANGULARIS. 



as the anal edge of the genital plates, carry prominent secondary tubercles; 

 auricles short, retreating rapidly towards lest, with low connecting ridges. 

 The color of the spines is uniform, varying from light pink to dark violet. 



Sandwich Islands ; Philippine Islands ; Seyrlii-lle Islands. 



Echinometra subangularis 



! Cidaris subangularis LESKE, 1778, Kl. Add. 

 Echinometra subangularis Df.sml., 1837, Syn. 

 (See Part II. p. 283.) 



PL X'.f. I -J,; PI. XXVI. f. 11-13. 

 West India Islands; Brazil; Cape Verde; Bermudas; Senegal 



Echinometra Van Brunti 



! Echinometra Van Brunti A. Ac. 18C3, Bull. M. C. '/.. 



This species differs from the West India E. subangularis by the narrow 

 arcs of the broad poriferous zone. The pores are small, placed close together, 

 from seven to eight and frequently even nine pairs of pores in each arc, 

 tin' upper pair of pores being separated from the remaining pores of each 

 arc by the exterior row of small ambulacra! tubercles. The difference in 

 size between the median interainhnlacral vertical rows of tubercles is more 

 marked than in the West India species. The abactinal system closely 

 resembles that of the West India subangularis; but the genital openings, 

 which are huge, are placed at the very outer termination of the plates, 

 while they are in central part of the plate in subangularis. The most 

 striking difference is the slender auricles, with the large auricular arch con- 

 nected by the narrow and low interainhnlacral ridge. The actinostome is 

 proportionally small, and the actinal cuts well marked for an Echinometra; 

 the spines, as far as I have seen specimens, are uniformly larger and more 

 slender in proportion to the size of the test. The color in life is deep violet. 



Peru; Panama; Gulf of California. 



