AGASSIZ AND CLARK : REPORT ON ECHINI. 237 



Station 4033. Penguin Bank, S. coast of Oalm, 28-29 fathoms. 

 Two specimens. 



Echinothrix turcarum Pet. 



Diadema turcarum Schynvien, 1711. Thes. Imag., p. 2 ; Plate 14, Fig. B. 

 Echinothrix turcarum Peters, 1853. Monatsb. Akad. Berlin, p. 484. 



A good series of adults and young, ranging from 25 to 80 mm. in diameter, 

 was taken at Puako Bay, Hawaii, and at Honolulu. 

 Twelve specimens. 



Astropyga radiata Gray. 

 Cidaris radiata Leske, 1778. Klein Nat. dis. Ech., p. 116 ; Plate 44, Fig. 1. 

 Astropyga radiata Gray, 1825. Ann. Phil. 10, p. 2. 



Only a single very small specimen (diameter, 26 mm.) is in the collection. 

 Station 3875. Auau Channel, between Maui and Lanai, 34-65 fathoms. 



Centrostephanus asteriscus A. Ao. and Clark. 



This very pretty little species is easily distinguished from other members of the 

 genus by the large number of coronal plates and the peculiar abactinal system. 

 In a specimen only 3.5 mm. in diameter there are already eight coronal plates, 

 while an individual 14 mm. in diameter has 13. The ocular plates are small and 

 nearly or quite excluded from the medium-sized anal system, which is closely 

 covered with very small plates. The oculars are more completely excluded in the 

 larger specimen than in the smaller ones. The genital pores are conspicuous. 

 The buccal plates carry spines as well as pedicellariae. The color is light reddish, 

 becoming reddish-white actinally, and the primary radioles are prettily banded 

 with red and whitish ; from the end of each ambulacrum a conspicuous white line 

 runs straight to the centre of the anal system, the five lines forming a conspicuous 

 star on the red abactinal surface ; the lines are broadest in the smallest specimen 

 and become narrower (relatively) with age. The largest specimen taken has the 

 test 14 mm. in diameter and 6.25 mm. high, the abactinal system 5.5 mm., and 

 the actinal system 6 mm. The primary radioles, the longest of which measure 

 20 mm., are provided with rather widely spaced whorls of very minute, sharp 

 spinelets. 



Station 4034. Penguin Bank, S. coast of Oahu, 14-28 fathoms. 



4066. Off Ka Lae-o Ka llio Point, Maui, 49-176 fathoms. 



4128. Off Hanamaulu, Kauai, 68-253 fathoms. 



4161. Off Modu Manu, 39-183 fathoms. 



4163. Off Modu Manu, 24-40 fathoms. 

 Five specimens. 



Chaetodiadema pallidum A. Ag. and Clark. 



Of this interesting genus, a handsome new species proves to be common in cer- 

 tain localities among the Hawaiian Islands. It is sharply distinguished from the 



