194 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Key to the Species. 



Primary spines not red; interambulacral secondaries whitish with a longi- 

 tudinal green stripe. 

 Primaries stout, less than 2 h. d. ; ambulacral secondaries dark green; 



abactinal system larger than actinostome bispinosa 



Primaries slender, 2-3 h. d. ; ambulacral secondaries like those of inter- 

 ambulacra; abactinal system smaller than actinostome . . . . glandulosa 

 Primary spines red (in young, sometimes greenish) with more or less in- 

 distinct cross-bands of white ; secondary spines reddisli or brownish, 

 not longitudinally striped ; abactinal system not larger than actino- 

 stome hawaiiensis 



Stephanocidaris bispinosa. 



Cidarites bispinosa Lamarck, 1816, Anim. s. Vert., 3, p. 57. 

 Stephanocidaris bispinosa A. Agassiz, 1872, Rev. Ech., pt. 1, p. 160. 



Plate If, fig, 1, Rev. Ech., A. Agassiz, 1873. 



It would be amusing were it not irritating to note how entirely recent writers 

 have ignored Agassiz's ('73) description and figure of this beautiful and appar- 

 ently very rare species. The trouble appears to date from de Loriol's ('73) fig- 

 ure, which is certainly not bispinosa, but is probably P. annulifera, in one of its 

 various color phases ; his figure of lutkeni is certainly annulifera, while his figure 

 of annulifera appears to be baculosa. Koehler ('95) evidently refers to the same 

 form of baculosa under the name annulifera, while his Stephanocidaris bispinosa 

 is probably true annulifera. Bedford (1900) lias apparently identified correctly 

 his specimens of annulifera, so far as can be determined from his figures. D6- 

 derlcin ( : 03) and Mortensen ('-04) entirely ignore Agassiz's description, or else 

 intimate that the description is inadequate because it fails to apply to their speci- 

 mens. As a matter of fact, it seems clear that neither of them has seen a speci- 

 men of the real bispinosa, but since they call the variety of baculosa with banded 

 primaries annulifera, they are obliged to do something with their specimens of real 

 annulifera, and so they suppose them to be St. bispinosa, Agassiz's description 

 and figures to the contrary notwithstanding ! Their lead is somewhat reluctantly 

 followed by de Meijere ( : 04), who is unwilling to ignore Agassiz's statements; 

 but he, too, records Ph. annulifera as St. bispinosa. This species reaches a 

 diameter of over 50 mm. Authentic specimens are known only from Australia 

 and Malacca. 



Stephanocidaris glandulosa. 



Cidaris (Cidaris) glandulosa de Meijere, 1904, Siboga-Exp. Ech., p. 13. 

 Plate 1, figs. 5, 6, Siboga-Exp. Ech., de Meijere, 1904. 



Among the interesting Echini collected by the " Siboga," in the Dutch East 

 Indies, were 14 small (7-25 mm. h. d.) specimens, taken at depths of 38-51 fths., 



