ECHINOCARDIUM. 261 



Station 3865. Off Mokuhooniki Islet, Pailolo Channel, H. I. Bott. temp. 

 45°-44.8°. 256-283 fms. Fne. vol. s., r. 



Station 3920. Off Diamond Head Light, Oahu, H. I. Bott. temp. 44.6°. 

 265-280 fms. Gy. s., brk. sh. 



Station 4028. Off Okula Point, Kauai, H. I. Bott. temp. 40°. 444-478 

 fms. Gy. s., glob. 



Station 4036. Off Kawaihae Light, Hawaii, H. I. Bott. temp. 38.2°. 

 687-692 fms. Fne. dk. gy. s., for. 



Station 4083. Off Puniawa Point, Maui, H. I. Bott. temp.? 238-253 

 fms. Gy. s. 



Station 4122. 1 Off Barber's Point Light, Oahu, H. I. Bott. temp. 64.6°- 

 42.3°. 192-352 fms. Fne. gy. s., m. 



Station 4906. Southwest of Koshika Islands, Japan. Bott. temp. 43.4°- 

 42.6°. 369^06 fms. Gy. glob. oz. 



Bathymetrical range, 238*-692 fms. Extremes of temperature, 48°-38.2°. 



Twenty specimens; some fragmentary. 



Echinocardium. 



Gray, 1825. Ann. Phil., 26, p. 430. 

 Type, Spatangus pusillus Leske, 1778 = Echinus cordatus Pennant, 1777, Brit. Zool., 4, p. 69. 



I quite agree with Mortensen that Lambert's attempt to make Spatangus 

 atropos Lamarck the type of this genus is lamentable and discouraging. More 

 than that however, it is quite wrong, not at all in accordance with the Inter- 

 national Code. Gray included three species in his genus Echinocardium {atropos, 

 pusillus, seba) but pusillus and seba are identical with each other (and also with 

 Pennant's Echinus cordatus). The third species atropos Agassiz removed to 

 Schizaster in 1836, leaving cordatus alone as a possible type for Echinocardium. 

 So recently and so well has this group been revised by Mortensen (1906. Ingolf 

 Ech., pt. 2, p. 132-152) that there is little to add. It is necessary, as Mortensen 

 thought likely, to revive the name laevigaster A. Agassiz, for the species from 

 Florida Strait, and the following key also includes the related Japanese form, 

 dubium. There are therefore eight species distinguished here as against six in 

 Mortensen's key but my indebtedness to him is obvious. 



1 It is obvious that the lesser depth at the higher temperature was not the habitat of Pseudolovenia. 



