SPATANGUS PALLIDUS. 239 



in size, the valves being .25-1.35 mm. long, but have no distinctive character. 

 The stout tridentate on the other hand show much less diversity in size, with 

 valves only .45-.70 mm. long, but are quite characteristic. The outline of the 

 blade (PI. 146, fig. 17) is rounded triangular, while the base is remarkably broad. 

 A typical pedicellaria of this kind from the type specimen of liitkeni gave the 

 following measurements for each valve: length, .68 mm.; width of basal part, 

 .55 mm.; height of base, .38 mm.; length of expanded part of blade, .18 mm.; 

 width of same, .23 mm. 



This species has been recorded from the Moluccas by Sluiter, but the 

 Siboga failed to find it in the East Indies, and it is not otherwise known save 

 from Japan. 



Station 3771. Off Doumiki Saki, Honshu Island, Japan. Bott. temp.? 

 61 fms. Gn. m., s. 



Station 4807. Off Cape Tsiuka, Japan. Bott. temp.? 44-47 fms. Sh., 

 crs. g. 



Station 5047. Off Kinka San Light, Japan. Bott. temp. 49.6°. 107 fms. 

 Dk. gy. s., brk. sh., p. 



Bathymetrical range, 44-107 fms. 



Six specimens. 



Spatangus pallidus. 



H. L. Clark, 1908. Bull. M. C. Z., 61, p. 307. 



Plates 146, fig. 18; 149, fig. 5; 157, figs. 1-4. 



All of the specimens I have seen of this species are small and probably 

 young and it is not impossible that they are merely a form of liitkeni, but the 

 markedly lighter color and the strongly keeled sternum give them quite a differ- 

 ent appearance. The photographs of the holotype (PI. 157, figs. 1-4) show well 

 the characteristic form of the test, subanal plastron, and sternum. The two 

 latter features are even better shown in the drawing (PI. 149, fig. 5) where the 

 composition of the plastron is clear. The great width of the subanal fasciole 

 is also well brought out in this figure. 



Pedicellariae seem to be very infrequent. Examination of two specimens 

 revealed only a single triphyllous with valves about .11 mm. long, some slender 

 tridentate, with valves .30-.80 mm. long but not distinctive, and a single stout 

 tridentate, with valves about .60 mm. long, and .35 mm. wide basally. The 



