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 Mokuliooniki Islet, Pailolo Channel, H. I. Bott. temp. 

 45.3°. 272-286 fathoms. Fne. gy. s. 



Station 4097. Off 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. I. Bott. temp. 41.6°. 

 350-355 fathoms. Co. s. for. 



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

 282 fathoms. Co. s. for. 



Station 4122. Off Barber's Point Light, Oahu, H. I. 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 sj^ecimens. 



Aspidodiadema tonsum A. Ag. 



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



Plate 50, figs. 3-5. 



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

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

 " Siboga," de Meijeie found slender tridentate (of two kinds), ophicephalous 

 and triphyllous pedicellaria3, while Mortensen found stout tridentate also in 

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

 cephalous pedicollaria), one with, the other without, glands on the 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 nil of the forms of pcdicellaria?, described and 



^ The temperatures of Stations 3S17 and 4122 are obviously wronp; they should prob.ibly read 

 4:V8° and 42.:5°, as shown by Stations 38ir> and 1123. which are immedialrly adjoining and at essen- 

 tially the snnio d<>iith. Hy the same roasoninc. the tomi>t'iaturos for Stations 3!»1 1 and 4178 may l>e 

 stated as 4()° and 42° respectively. In estimating the average temperature these corrected figures 

 have been used. 



