24 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
ably from those of the type, so it is possible that it is really a different 
_pecies; but as both the present specimen and the type are young it 
is impossible to decide whether this difference, and the difference in 
color, may perhaps in reality be specific differences. The highly 
characteristic pedicellariae, with delicate spoon-shaped valves, are 
alike in both. 
Order STIRODONTA 
Family SALENIIDAE 
Genus SALENOCIDARIS A. Agassiz 
SALENOCIDARIS HASTIGERA (A. Agassiz) 
Salenia hastigera A. Acassiz, Challenger Reports, Zoology, vol. 3, pt. 9, Echin- 
oidea, p. 54, pl. 4, figs. 3-17, 1881; Panamic deep-sea Echini, pl. 20, fig. 8, 1904. 
Salenocidaris hastigera MORTENSEN, Monograph of the Echinoidea, vol. 2, p. 360, 
pl. 56, figs. 1-2; pl. 85, figs. 5-7, 31-33; pl. 86, figs. 17-20, 1935. 
Locality —Station 5601; Gulf of Tomini, Celebes; Limbe Island 
(NE.) bearing N., 20.7 miles distant (lat. 1°13’10’’ N., long. 125° 
17’05’’E.) ; 1,398 meters; sand, globigerinae, and pteropods; No- 
vember 13, 1909. One specimen. 
Remarks.—In their Hawaiian and other Pacific Echini published 
in 1908, on page 58, Agassiz and Clark declare Salenocidaris hastigera 
identical with S. profundi (Duncan). This undoubtedly holds good 
for the Atlantic specimens identified as S. hastigera, but not for the 
specimens from the Indo-Malayan region, which are distinguished 
from the Atlantic form particularly by ocular I being exsert, even 
in the adult, whereas in the Atlantic profundi ocular I is broadly 
insert—except for the variety occlusa Mortensen, which has ocular I 
exsert like hastigera, from which species it differs, however, in other 
characters so as to be decidedly the nearer related to profundi. 
Since in the preliminary report on the Challenger echinoids Agassiz 
mentions under his Salenia hastigera first the station 195, Banda Sea, 
the specimen from that station must be taken to represent the type 
specimen of Aastigera, and the name hastigera is thus to be preserved 
for the form from the Indo-Malayan region. 
SALENOCIDARIS HASTIGERA var. ACUMINATA Mortensen 
Salenocidaris hastigera, var. acuminata Mortensen, Vid. Medd. Dansk Naturh. 
Foren., vol. 98, p. 166, 1934; Monograph of the Echinoidea, vol. 2, p. 368, 
pl. 85, fig. 14; pl. 86, figs. 11-13, 1935. 
Locality.—Station 5614; Molucea Passage; Tifori Island (C.) bear- 
ihg N. 19° E., 30.5 miles distant (lat. 0°31’00’’ N., long. 125°58745’” 
KE.) ; 2,010 meters; gray mud, sand, and globigerinae; November 22, 
1909. One specimen. 
Remarks.—This specimen, which measures 9 mm. in horizontal 
diameter, differs from the typical hastigera in various points. The 
