28 HAWAIIAN AXD OTHER PACIFLC ECHINI. 



Station 3752. Off Siino Saki, Sagami Bay, Japan. 54-100 fathoms. 



Gy. s. g. 



Bathymetrical range, 54-200 fathoms. Fifteen specimens. 



Goniocidaris mikado Dod. 



Discocidaris (Cidaris) mikado Dod., 1885. Arch. f. Naturg., 51 Jahrg., Bd. I, p. 80. 

 Goniocidaris mikado Dod., 1887. Jap. Seeigel, p. 15. Pis. VII and VIII, iigs. 6 and 9-18. 



Plate 10, fig. 26. 



Two specimens of this species were collected by the "Albatross" in 

 Sa^J-ami Bay. As has been stated by Doderlein, it is one of the most beautiful 

 and elegant of the Cidaridae, and the peculiar structure of its primary 

 ambulacra! spines is without parallel in the family. The remarkable cupuli- 

 form expansion of the shaft occurs immediately above the milled ring, while 

 in G. tuharia the great expansion of the shaft takes place at its extremity ; 

 in G. mikado, moreover, there are rudimentary cupular expansions along the 

 shaft, often merely flattened serrations. The distal part of the shaft carries 

 smaller serrations. Doderlein has given a number of figures showing the 

 great variation found among the primary radioles of this species in Pis. YII 

 and VIII of his Memoir on Japanese Sea Urchins, though even the best 

 lithographic figures can scarcely do justice to the great delicacy of the 

 structure of the primary radioles. 



This species is notable for the absence of both large globiferous and tri- 

 dentate pedicellarioe. The small globiferous pedicellarice (PI. 10, fig. 26) 

 have a very large end-tooth with the opening some distance beneath it. 

 The valves are very small, only .20-. 30 mm. in length, while the stalk is even 

 shorter. They occur abundantly everywhere on the test. 



Station 3755. Off Suno Saki, Sagami Bay, Japan. 52-77 fathoms. 

 Gy. s. CO. 



Station 3759. Off Suno Saki, Sagami Bay, Japan. 52-60 fathoms. 

 Gy. s. fne. g. brk. sh. r. 



I 



