98 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 3920. Off Diamond Head, Oahu, Hawaiian Islands. Bott. temp. 

 44.6°. 265-280 fathoms. Gy. s. br. sh. 



Station 4096. Off Mokuhooniki Islet, Pailolo Channel, H. I. Bott. temp. 

 45.3°. 272-286 fathoms. Fne. gy. s. 



Station 4097. Oflf Mokuhooniki Islet, Pailolo Channel, H. I. Bott. temp. 

 44.2°. 286 fathoms. Fne. gy. s. 



Station 4105. Off Lae-o Ka Laau Light, Molokai, H. I. Bott. temp. 43.8°. 

 314-335 fathoms. Fne. co. s. for. 



Station 4107. Off Lae-o Ka Laau Light, Molokai, H. L Bott. temp. 41.6°. 

 350-355 fathoms. Co. s. for. 



Station 4116. Off Kahuku Point, Oahu, H. I. Bott. temp. 48.8°. 241- 

 282 fathoms. Co. s. for. 



Station 4122. Off Barber's Point Light, Oahu, H. L Bott. temp. 64.6°. 

 192—352 fathoms. Crs. co. s. sh. 



Station 4178. (?) Off Kawahioa Point, Niihau, H. I. 319-378 fathoms. 

 Co. s. r. p. 



Bathymetrical range, 192-378 fathoms, but averaging under 300 fath- 

 oms. Extremes of temperature, 48. 8°-41. 6°; average temperature, 44.7°.^ 

 One hundred and forty-nine specimens. 



Aspidodiadema tonsum A. Ag. 



Aspidodiadema tonsum A. Agassiz, 1879. Proc. Amer. Acad., XIV, p. 199. 



Plate 50, figs. 3-5. 



The pedicellariiB of this species show greater diversity of form than in 

 any other Echinoid we have examined. In the specimens collected by the 

 " Siboga," de Meijere found slender tridentate (of two kinds), opliicephalous 

 and triphyllous pedicellariae, while Mortensen found stout tridentate also in 

 the specimens which he examined. The latter speaks of two kinds of oplii- 

 cephalous pedicellariag, one with, the other without, glands on tlie stalk ; 

 we are inclined to think that this difference is due to the condition of the 

 glands, whether full or recently discharged, and not to their actual presence 

 or absence. We have found all of the forms of pedicellariae, described and 



1 Tlie temperatures of Stations 3817 and 4122 are obviously wrong; they should probably read 

 43.8° and 42.3°, as shown by Stations 3815 and 4123, which are immediately adjoining and at essen- 

 tially the same depth. By the same rea.soning. the temperatures for Stations 3914 and 4178 may be 

 stated as 46° and 42° respectively. lu estimating the average temperature these corrected figures 

 have been used. 



