10 HAWAII AX AXD OTHER PACIFIC ECHIXI. 



them to be the young of Dorocidaris hradeata, although the serrations of the 

 radioles (PI. 3, fig. 24) are sharper and more prominent than the bhmt ones 

 forming the ridge of the fluting of larger specimens. The color of the bands 

 of the radioles is light greenish brown; the small spines are of a lighter color, 

 yellowish gray, while the older specimens of D. hradeata collected by the 

 "Challenger" were of a reddish-brown tint. Coming from so near the spot, 

 where the adults of D. Reini Doderlein (referred to beyond) were taken, it 

 would be natural to regard these small specimens as the young of that 

 species ; but the form and coloration of the spines leave no doubt that 

 they belong rather to hradeata. In these specimens, all three kinds of 

 pedicellariaa are present. They resemble quite closely those of D. Reini, but 

 are somewhat smaller. 



The large globiferous pedicellariae (PI. 3, fig. 15) are more common and the 

 limb (PL 3, fig. 23) curves outward more than in Reini and its branches are 

 sometimes provided with additional projections. In addition to these, other 

 large pedicellarice (PI. 3, fig. 10) are found which have the opening of the 

 valves on the inner surface, very large and with no lip, somewhat like those 

 which Mortensen considers characteristic of Stereocidaris. There are also tri- 

 dentate pedicellariae with strongly curved valves (PI. 3, figs. 19, 20), which 

 are quite peculiar. The small globiferous pedicellarire (PI. 3, figs. 17, IS) 

 often lack the end-tooth. 



Mortensen, on the strength of a large pedicellaria like PI. 3, fig. 17, places 

 this species in Stcphanocidaris, while the presence of pedicellariie like 

 PI. 3, fig. If) surely fixes its place, according to his scheme, in Cidaris ! 

 On the other hand, PI. 3, fig. 10 would seem to show that it is nearer to 

 Stereocidaris ! What are we to do in the face of such disorderly pedicellariae ? 



Dorocidaris Reini Dod. 



Cidaris (Dorocidaris) Reini I)()clerlein, 1887. Jap. Seeigel., p. 7, Taf. IV, figs. 1-7 



and Taf. VIII, fig. 4 a-d. 



Plate 3, figs. 1-14. 

 Five specimens of this species were collected off Honshu Inland, Japan, 

 which ngrc(^ well with the specimen figured by Diidorlein. They range in size 

 from 22 mm. to 30 mm. in diam. The primary radioles (PI. 3. fig. 9) are very 

 uniform in appearance and structure , in one of the specimens, however, the 

 radioles are somewhat more slender and proportionally longer in comparison 

 to the diameter of the test than in the specimen figured by Doderlein. 



