AGASSIZ AND CLARK: REPORT ON ECHINI. 253 



Pycnolampas oviformis A. Ag. and Clark. 



The specimens collected range from 15 to 22 mm. in longitudinal diameter. 

 The largest is 17 mm. wide, 9 mm. high anteriorly, and 10 mm. high posteriorly. 

 The peripetalous fasciole is nearly circular, somewhat pointed behind, 14 x 12 

 mm. The color is pearly white with a purplish tint on the abactinal system ; the 

 fascioles are brown and the spines are yellowish- white. 



Station 3838. Off Lae-o Ka Laau Light, Molokai, 92-212 fathoms. 

 3890. Off Mokapu Islet, Molokai, 71-283 fathoms. 

 " 4044. Off Kawaihae Light, Hawaii, 198-233 fathoms. 

 Five specimens. 



SPATANGINA Gray. 

 Spatangus paucituberculatus A. Ag. and Clark. 



This species is most nearly related to S. Lutkeni A. Ag., but is quite different 

 from that species. The test is very broad and flat and obliquely truncated pos- 

 teriorly, sloping towards the actinostome. The groove of the anterior ambulacrum 

 is very deep. On each side of it are a number of primary tubercles ; in the lateral 

 interambulacra the number of primary tubercles is 2, 1, or 0, and in the posterior 

 interambulacrum there are not more than 9 or 10. The anal system is small and 

 nearly circular. The actinal surface is much as in Lutkeni. The largest speci- 

 men is 78 mm. long, 74 mm. wide, and only 40 mm. high; the anterior furrow is 

 5 mm. deep and 13 mm. wide, at the ambitus. The color is purple, with white 

 tubercles ; primaries and secondaries silvery-white becoming purple at the base ; 

 miliary spines purple. 



Station 3863. Off Mokuhooniki Islet, Pailolo Channel, 127-154 fathoms. 

 3865. Off Mokuhooniki Islet, Pailolo Channel, 256-283 fathoms. 

 " 4096. Off Mokuhooniki Islet, Pailolo Channel, 272-286 fathoms. 

 " 4097. Off Mokuhooniki Islet, Pailolo Channel, 286 fathoms. 

 " 4116. Off Kahuku Point, Oahu, 241-282 fathoms. 

 Twelve specimens. 



Gymnopatagus D6d. 



Gymnopatagus Doderlein 1901. Zool. Anz. Bd. 23, p. 22. 



This genus was established by Doderlein for an interesting Spatangoid, taken 

 by the " Valdivia " off the east coast of Africa, related to Eupatagus but having a 

 decided furrow for the anterior ambulacrum. The " Albatross " has collected 

 among the Hawaiian Islands two species of large Spatangoids, which are of special 

 interest because they are evidently connecting links between these two genera. 

 In one of them the anterior furrow is quite distinct, while in the other it is barely 

 indicated, and yet the two are obviously congeneric. In both species the anterior 

 poriferous zones of the lateral ambulacra are much narrower than the posterior 

 zones, and are almost rudimentary near the abactinal system ; a condition not 



