84 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Coelopleurus Maillardi A. Ag. 



Keraiaphorus Maillardi Michelin, 1862. Maillard's Bourbon, Ann^x. A, p. 2; PI. XIV. 

 CcelopleuruB Maillardi A. Agassiz, 1871. Bull. M. C. Z., II, p. 456. 



Plates 49, fig. SJ^ ; 53, figs. 5, 9. 



Although small specimens (6-19 mm. in diameter) of what appears to be 

 this species were taken in considerable numbers by the " Siboga " in the Dutch 

 East Indies, de Meijere (1904) gives no figures or description of the pedicel- 

 lariae. Thanks to Dr. Weber of the Amsterdam Museum, the Museum of 

 Comparative Zoology received in exchange one of these "Siboga" speci- 

 mens, and there is little reason to doubt the correctness of de Meijere's 

 identification. These young specimens, however, show only indistinctly the 

 peculiar, nearly horizontal markings on the bare, abactinal, interambulacral 

 spaces, so clearly shown in Michelin's figures. These bare areas are purplish- 

 blue in the '' Siboga'' specimens, and there is far less of a reddish tinge on 

 the abactinal parts of the test than is indicated by Michelin. These slight 

 differences may well be due to the diflference in size, as Michelin's specimen 

 was 42 mm. in diameter. 



The tridentate pedicellariaB show no peculiarities, resembling those of 

 floridanus, but the ophicephalous are remarkable for their very slender, 

 highly constricted valves, resembling far more closely those of JJoridanus 

 than they do those of either macidatiis or longicollis. The valves of the tri- 

 dentate pedicellarioa are colorless, and measure .18-.90 mm. in length. The 

 valves of the ophicephalous pedicellarioe are lightly colored with greenish and 

 reddish as in maculatus, but much less markedly so ; they are .20-.45 mm. in 

 length. The small size of the pedicellariae is doubtless due, at least in part, 

 to the small size of the specimen from which they were taken, the test of 

 which was only about 10 mm. in diameter. The calcareous particles and 

 sphoeridia showed no peculiarities. 



Coelopleurus maculatus A. Ag. and CI. 



CcElopleurus maculatus A. Agassiz and Clark, 1907. Bull. M. C. Z., LI, p. 116. 

 Coelopleurus Maillardi A. Ag. " Challenger " Echini, ]). GO (;^((r<m). l*ls. V, fig. 3 > 

 VI, figs. 8-14 (^non !Michelin). 



Plates 49, figs. 21-2S; 53, figs. 1-7; 57, figs. ^-6. 



Tn the "Challenger" Echini Report (pp. 00-01) a number of specimens 

 of Ca'lopleurus collected at Amboina and in the Pliilippinos were referred to 



