242 bulletin: museum of comparative zoology. 



Puako Bay, Hawaii. 

 Honolulu reefs. 

 Lanai Island. 

 Necker Island. 

 Haualei, Kaui. 

 Kamalino Bay, Niihau. 

 Laysan Island. 

 Thirty-eight specimens. 



Bchinostrephus molare A. Ag. 



Echinus molaris de Blainville, 1825. Diet. Sei. Nat. 37, p. 88. 

 Echinostrephus molare A. Agassiz, 1872. Rev. Ech. Plate 1, p. 119. 



A good series of this species is in the collection. 



Laysan Island. 



Station 3959. Off Laysan Island, 10 fathoms. 



" 3960. Off Laysan Island, 10-19 fathoms. 



" 3968. French Frigate shoal, 14^16^ fathoms. 



" 3969. French Frigate Shoal, 15-16 fathoms. 



" 3970. French Frigate Shoal, 17-17i fathoms. 



" 3975. Off Necker Island Shoal, 16-171 fathoms. 



" 4117. Off Modu Mauu, 26 fathoms. 

 Twenty specimens. 



TEMNOPLEURIDAE Desor. 

 Trigonocidaris albidoidea A. Ag. and Clark 



This is the Pacific representative of T. albida of the West Indies, and is closely 

 allied to that species. It differs in having the test less clearly and deeply sculp- 

 tured, especially abactiually, and in having more spines on the abactinal system. 

 But the most obvious differences are in coloration: adult West Indian specimens 

 have the abactinal system, especially the genital plates, and many of the primary 

 tubercles very decidedly reddish, while the primary spines are pure white; the 

 Hawaiian specimens have no trace of red on the test or tubercles, but some or all 

 of the primaries, especially actinally, are distinctly banded or tipped with red. Of 

 course young specimens (under 4 mm.) do not show these differences, but m 

 adults they are quite evident. The specimen in the " Siboga" collection which 

 had orange-banded spines, referred by de Meijere with some hesitation to albida, 

 is evidently the Pacific form. 



Station 3859. Off Mokuhooniki Islet, Pailolo Channel, 138-140 fathoms 

 " 3863. Off Mokuhooniki Islet, Pailolo Channel, 127-154 fathoms. 

 3892. Off Mokapu Islet, N. coast of Molokai, 328-414 fathoms. 

 « 4045. Off Kawaihae Light, W. coast of Hawaii, 147-198 fathoms. 



Five specimens. 



