AGASSIZ AND CLARK : KEPORT ON ECHINI. 235 



ASPIDODIADEMATIDAE Duncan. 



Aspidodiadema nicobaricum Dod. 



Aspidodiadema nicobaricum Uoderleiii, 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 Dodcrlcin, as the largest is 

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

 enees in color, the Hawaiian specimens being much paler. 



Station 3S92. Oif Mokapu Islet, N. coast of Molokai, 328-414 fathoms. 

 « 3981. Otf Nawiliwili Light, Kauai, 414-636 fathoms. 

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

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

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

 " 4013. Otf Hauamaulu, 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 Hauamaulu, Kauai, 257-309 fathoms. 

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



4140. Off Hauamaulu, Kauai, 339-437 fathoms. 



4141. Off Hauamaulu, Kauai, 437-632 fathoms. 

 4166. Off Modu Maun, 293-800 fathoms. 



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

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

 4187. Off Hauamaulu, 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 tlie abactuial and 

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

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



