218 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



Primaries cylindrical, at least near base, never provided with " wings," 

 but with more or less evident, longitudinal series of rounded or sharp 

 granules, tending to become ridges near tip of spine, which is often 

 flaring. 

 Ambulacra very narrow, only .18-25 of interambulacra, not deeply 

 sunken ; median area closely covered with 6 series of tubercles ; 

 all miliaries very minute ; neck of primaries white . . microtuberculata 

 Ambulacra .25-.33 of interambulacra in width. 



Secondaries not white ; actinostome much smaller than abactinal 

 system ; tridentate pedicellariae present. 

 Abactinal system elevated 10% or more above test; abactinal 

 surface appears very bare from small, wide, closely appressed 

 miliaries; primaries not white with purple collar .... grandis 

 Abactinal system flat or little elevated; abactinal surface well 

 covered with ordinary miliaries; primaries when perfectly 

 clean, white, usually with a distinct purple collar . . . leucacantha 

 Secondaries white or whitish ; actinostome nearly equal to abac- 

 tinal system ; no tridentate pedicellariae sceptriferoides 



Stereocidaris indica. 



Stereocidaris indica Doderlein, 1901, ZoiJl. Anz., 23, p. 19. 

 Plate 10, figs. 1, 2; Plate 11, Deutsche Tiefsee Exp. Ech., Doderlein, 1906. 



This species appears to be very variable, and Doderlein ( : 06), recognizes four 

 varieties (Integra, africana, carinata, sumatrana), based upon slight differences 

 chiefly in primary spines and pedicellariae. He says, however, that he doubts the 

 constancy of any of these varieties except sumatrana, which appears to be well- 

 marked. Dbderlein's admirable descriptions and his tables of measurements are 

 all that could be desired, but the figures given often suffer from indistinctness ; 

 they are quite good enough, however, to reveal the notable diversity in the pedi- 

 cellariae of this species. The color is yellowish, each of the larger secondaries 

 with a dark spot and the actinal primaries white. The largest specimen measured 

 46 mm. h. d. The distribution of indica is from Somali-Land to the Moluccas, in 

 443-715 fths. 



Stereocidaris capensis. 



Stereocidaris indica var. capensis Doderlein, 1901, Zool. Anz., 23, p. 19. 

 Stereocidaris capensis Doderlein, 1906, Deutsche Tiefsee Exp. Ech., p. 110. 



Plate 10, figs. 3-6, Deutsche Tiefsee Exp. Ech., Doderlein, 1906. 



Although closely related to the preceding species, Doderlein considers the 

 South African form entitled to specific rank. As he finds the chief and most 

 constant character iu the calcareous plates of the pedicels, the species seems 

 to me open to serious doubt, for I do not consider that any importance can 

 be attached to the exact form of the microscopic, calcareous particles of the 

 Echini. The only known specimens of capensis were taken by the " Valdivia " 



