326 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
Allotype male-—U.S.N.M. No. 74147, described by Dr. Wilson, but 
cannot now be found in the collection which he returned to the 
National Museum. 
SCAPHOCALANUS BREVICORNIS (Sars) 
PLatTe 33, Ficures 507-509 
Scolecithrix brevicornis Sars, Norwegian North Polar Exped., vol. 5, Crustacea, 
p. 46, pl. 10, 1900. 
Station 5185. Founded by Sars upon a few female specimens taken 
north of latitude 81° during the Norwegian North Polar Expedition 
and placed in the genus Scolecithriz. Found in the Polar Ocean be- 
tween Spitsbergen and Greenland by With (1915, p. 192) and trans- 
ferred to the present genus. Reported in the Antarctic by Farran 
(1929, p. 248) and kept in the present genus, where it evidently belongs. 
Not in any of the plankton lists. A single male and female were taken 
in a tow at this Albatross station at a depth of 550 fathoms. Camera- 
lucida drawings of the fifth legs of each sex are here presented and 
leave no doubt of the identity of the species, and a dorsal view of the 
male is included since none has ever appeared. U.S.N.M. No. 74148. 
SCAPHOCALANUS ECHINATUS (Farran) 
Puate 34, Fiagures 510-511 
Scolecithriz echinata FarRan, Ann. Rep. Fisheries Ireland, 1902-3, pt. 2, app. 2, 
p. 37, pl. 4, figs. 15-18; pl. 5, figs. 12-17, 1905. 
Stations 3799 ; 4758 ; 5231; 5263. Established by Farran upon a few 
female specimens captured off the coast of Ireland; later reported off 
New Zealand (Farran, 1929, p. 250). Evidently no male was found 
at either time although such a statement was not made. The plankton 
from station 3799 in the Hawaiian Islands, however, yielded a male 
and two females, and the former is here described for the first time. 
Female.—Head smoothly rounded in front, without a crest, fourth 
and fifth segments fused with rounded posterior corners. Urosome 
one-fourth as long and one-fifth as wide as the metasome and 4-seg- 
mented, the three abdominal segments equal in length and width. 
Caudal rami as wide as long, well separated, and somewhat divergent. 
The first antennae reaching the center of the last segment of the meta- 
some. The fifth legs 2-segmented, the end segment with a long smooth 
terminal seta, a coarsely toothed inner seta, and a small tooth on the 
outer margin opposite the base of the inner seta. Total length 2 to 
2.4 mm. 
Male—Metasome elongate elliptical, three times as long as wide; 
head broadly rounded and without a crest; fourth and fifth segments 
fused with rounded corners. Urosome almost a third as long and a 
