AGASSIZ AND CLARK : REPORT ON ECHINI. 235 



ASPIDODIADEMATIDAB Duncan. 



Aspidodiadema nicobaricum D6d. 

 Aspidodiadema nicobaricum Doderlein, 1901. Zool. Anz. Bd. 24, p. 21. 



This species was taken at many stations, and in considerable numbers. The 

 specimens are much smaller than those described by Doderlein, as the largest is 

 only 25 mm. in diameter, while his were 33-39 mm. There are also slight differ- 

 ences in color, the Hawaiian specimens being much paler. 



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

 " 3981. Off Nawiliwili Light, Kauai, 414-636 fathoms. 

 " 3988. Off Hanamaulu, Kauai, 165-469 fathoms. 

 3989. Off Hanamaulu, Kauai, 385-500 fathoms. 

 3994. Off Mokuaeae Islet, Kauai, 330-382 fathoms. 

 " 4013. Off Hanamaulu, Kauai, 399-419 fathoms. 

 " 4014. Off Hanamaulu, Kauai, 362-399 fathoms. 

 " 4021. Off Hanamaulu, Kauai, 286-399 fathoms. 

 " 4022. Off Hanamaulu, Kauai, 374-399 fathoms. 

 " 4025. Off Mokuaeae Point, Kauai, 275-368 fathoms. 

 " 4030. Off Ukula Point, Kauai, 423-438 fathoms. 

 " 4107. Off Lae-o Ka Laau Light, Molokai, 350-355 fathoms. 

 " 4110. Off Lae-o Ka Laau Light, Molokai, 449-460 fathoms. 

 " 4112. Off Lae-o Ka Laau Light, Molokai, 433-447 fathoms. 

 " 4131. Off Hanamaulu, Kauai, 257-309 fathoms. 

 " 4137. Off Hanamaulu, Kauai, 411-476 fathoms. 

 " 4140. Off Hanamaulu, Kauai, 339-437 fathoms. 

 " 4141. Off Hanamaulu, Kauai, 437-632 fathoms. 

 " 4166. Off Modu Manu, 293-800 fathoms. 

 " 4177. Off Kawahioa Point, Niihau, 319-451 fathoms. 

 " 4180. Off Kawahioa Point, Niihau, 417-426 fathoms. 

 " 4187. Off Hanamaulu, Kauai, 508-703 fathoms. 

 The average depth at these stations is 424 fathoms and there is no reason to 

 believe that any specimens of this species were taken in less than 300 fathoms. 

 One hundred and sixty-nine specimens. 



Aspidodiadema meijerei A. Ag. and Clark. 



Aspidodiadema nicobaricum var. meijerei Doderlein, 1906. Echin. Deutsch. 

 Tiefsee-Exp., p. 165. 



A large series of this form was taken by the " Albatross," and as it seems to 

 show constant characters, we look upon it as a distinct species, although the features 

 on which it is based are slight. Besides the striking difference in color of the 

 primary spines, there is a slight difference in the relative size of the abactinal and 

 anal systems. In the Hawaiian specimens of nicobaricum, the primary spines are 

 very pale purplish, the actinal surface of the test tends to become deep purple, 



