122 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 4128. Off Hanamaulu, Kauai, Hawaiian Islands. Bott. temp. 

 47.8°. 68-253 fathoms. Crs. br. co. s. for. 



Station 4161. Off Modu Mann, H. I. Bott. temp. 77.9°. 39-183 

 fathoms. Co. corln. 



Station 4163. Off Modu Manu, H. I. Bott. Temp. 78.1°. 24-40 

 fathoms. Co. 



Batliymetrical range, 14-253 fathoms. Extremes of temperature, 

 78.1°-47.8°. Five specimens. 



Micro PTGA. 



A. Agassiz, 1879. Proc. Am. Acad., XIV, p. 200. 

 Type-species, Microptjr/a tuherculata A. Agassiz, 1879. Proc. Am. Acad., XIV, p. 200. 



Having already discussed the peculiarities of this genus, we need only 

 add here that there seem to be two well-marked species, the " Siboga " hav- 

 ing collected a single specimen, which, while a Micropyga, is clearly not 

 tuherculata A. Ag. To this form, which was taken off Ceram in 512 fms., 

 de Meijere has given the name violacea. The " Challenger " species was 

 taken by the "Siboga" at two stations and was also taken once by the 

 " Valdivia," so that it is now known to range from Sumatra to the Fiji 

 Islands in depths of 100 to 225 fms. (possibly 610 at Fiji). The two species 

 are easily distinguished as follows : 



Ambulacra with only 2 columns of primary tubercles ; abactinal surface 

 with comparatively few primary tubercles (about 600 in a specimen, 100 

 mm. h. d.) ; buccal membrane perfectly bare tuherculata. 



Ambulacra with 4 columns of primary tubercles ; abactinal surface with 

 numerous primary tubercles (about 1100 in a specimen, 84 mm. h. d.) ; 

 buccal membrane covered with pedicellarise violacea. 



Eremoptga. 



Gen. nov. 

 Type-species, Astrojvjga denudata de Meijere, 1903. Tijdschr. Ned. Dierk. Vereen. 

 (2) VIII, p. 4. 



The specimens of this handsome Echinoid, on which de Meijere based his 

 new species of Astropyga, were taken by the "Siboga" at three widely 

 separated stations, near Celebes, Flores, and Sumbawa, at depths of 82-152 

 fms. As already stated, they seem to us to be quite distinct from Astropyga, 

 and we have accordingly formed this new genus for them. Mortensen 



