NO. 5 CLARK : ECHINI OF WARMER EASTERN PACIFIC 247 



Other records, however, extend its range to Ecuador and Chile. 

 Type. — Unknown. 



Type locality. — "Carthagena on the west side of the Isthmus of 

 Darien." (Panama) 



Depth. — Shore to 10 fms. 



Specimens examined. — 16 specimens from 6 stations. 



Tetrapygus niger (Molina) 

 Plate 40, Fig. 13 



Echinus niger Molina, 1782, p. 200. 



Tetrapygus niger A. Agassiz and H. L. Clark, p. 73. 



H. L. Clark, 1910, p. 345, pi. 10, f^g. 1. 

 Mortensen, 1935, p. 582, pi. 70, figs. 10-12. 



This is one of the most characteristic of the sea-urchins of the South 

 American Pacific coast for it is primarily a Peruvian species and has not 

 yet been found north of the equator nor at the Galapagos Islands. The 

 Velero collection contains 274 specimens. Over 250 of these were found 

 along shore and are for the most part adult; few are less than 15 mm h. d. 

 Only at Fronton Island, near Callao, in 5 fms, were specimens of niger 

 dredged. The color of the adults is dull black; small specimens (under 25 

 mm) tend to be more brownish but not markedly so. South of Peru, niger 

 ranges far down on the Chilean coast but its northern limit is near Payta, 

 Peru. At the Lobos de Afuera Islands it is very common. Other authors 

 include Chile and Patagonia in the range. 



Type. — Unknown. 



Type locality. — Chile. 



Depth. — Shore to 5 fms. 



Specimens examined. — 274 specimens from 9 stations. 



Family Echinidae 



Lytechinus anamesus H. L. Clark 

 Plate 41, Fig. 14 



Lytechinus anamesus Yi. L. Clark, 1912, p. 254, pi. 107, figs. 7-11. 



Mortensen, 1943, p. 452, pi. 23, figs. 33-40. 

 Apparently the commonest sea-urchin in moderate depths off the 

 southern California coast, this rather attractive small species was taken by 

 the Velero at no fewer than 155 stations at depths of 8 to 160 fms. Alto- 

 gether 5,090 specimens were secured, the largest 37 mm in diameter. 

 When very young it is light colored, often quite white, more often cream 



