MUSEUM OF COMPARATIVE ZOOLOGY. 21 



Echinostrephus aeiculatus A. Ao. 



Tubercles of ambulacral and interambulacral space of the same size. 

 Spines long, equalling diameter of test. Anal system small, pores arranged 

 in arcs of four pairs. — Kingsmills and Sandwich Islands. 



Heterocentrotus Br. Prod, (emend.) 



Heterocentrotus mammillatus Br. Prod. 



Syn. Heterocentrotus carinatus Br. Prod. ; H. Postellsii Br. ; Acrocla- 

 dia mammillata Ac. Cat. Kais. ; A. hastifera Ag. Cat. Rais. — Sandwich 

 Islands. 



Acrocladia Ao. (emend.) 



Acroeladia trigonaria Ao. Cat. Rais. — Kingsmills Islands. 



Acrocladia cuspidata A. Ao. 



Syn. Acrocladia trigonaria Mich. Faune de Maurice (non Ag.) 



Circular outline of test, uniform size of tubercles, distinctness of ocular 

 and genital plates, distinguish this species. Spines triangular, rather short, 

 tapering rapidly. — Mauritius. 



Podophora Ag. Cat. Rais. (emend.). 

 Podophora atrata Ao. Cat. Rais. — Mauritius. 



Podophora Quoyi A. Ag. 



Syn. Echinometra Quoyi Bl. non P. Quoyi Ag. — Sandwich Islands. 

 Colobocentrotus Leskei Br. belongs to a different genus. Podophora has, 

 therefore, been retained for the preceding species, although Brandt included 

 the P. atrata in his genus Colobocentrotus. (See Cat. Echin. N. P. Ex. Ex.) 



Echinometra Bretn. 

 Echinometra Miehelini Des., Ag. Cat. Pais. — Florida. 



It is with some doubt that the common Echinometra of Florida is referred 

 to this species. 



Echinometra Oblonga Bl. Diet. Sc. Nat. — Sandwich Islands. 

 Echinometra acufera Bl. Diet. Sc. Nat. — Zanzibar. 

 Echinometra lucunter Lamk. 



Echinometra Mathcei Ag. Cat. Rais. p. p. (non Bl.) — Sandwich, Society, 

 and Kingsmills Islands. 



Echinometra VanBrunti A. Ag. 



Remarkable for its flatness, the height of its tubercles, and the narrowness 

 of the poriferous zone. Spines long and slender, of uniform size, color dark 

 violet. — Acapulco. 



Echinometra rupieola A. Ag. 



Closely allied to E. VanBrunti ; differs from it by the smaller number 

 of tubercles, the great difference in size between the ambulacral and inter- 



