316 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
and as long as the abdomen, with two small spines at each posterior 
corner. The four abdominal segments the same width and the first 
three about the same length, the anal segment longer, with a posterior 
sinus for two-thirds of its length. Caudal rami as long as the anal 
segment, three times as long as wide, the outer seta at the center of 
the outer margin. 
Antennae, mouth parts (except the second maxillae and the max- 
illipeds), and swimming legs like those of the female. The second 
maxilla is shown in figure 485; the basal segment has a rounded 
protuberance on the inner margin at the distal end. The second 
segment is terminated by a sickle-shaped process whose convex mar- 
gin is fringed with a row of spines, diminishing in size outwardly. 
Inside the base of this process are two long slender spines half as 
long as the process and blunt at their tips. The maxilliped (fig. 486) 
is made up of two stout basal segments and a slender terminal claw 
nearly as long as the two segments combined, curved but little, and 
blunt at its tip. Along the ventral surface of the second segment 
is an irregular row of small saw teeth, and the inner surface of the 
segment is hollowed out and armed with two spines. Total length, 
without caudal rami, 3mm. Greatest width 1 mm. 
Types.—U.S.N.M. No. 74145; station 5223, latitude 13°36’ N., longi- 
tude 121°25’30” E., off Santa Cruz, Philippine Islands. 
Remarks.—This species is smaller than Thompson and Scott’s maw- 
imus, and, as shown in the above description, there are specific differ- 
ences in nearly every one of the appendages. 
Genus PSEUDEUCHAETA Sars, 1905 
PSEUDEUCHAETA BREVICAUDA Sars 
Pseudeuchaeta brevicauda Sars, Bull. Mus. Océanogr. Monaco, No. 26, p. 18, 
1905a; Rés. camp. sci. Albert de Monaco, No. 69, p. 102, pl. 29, figs. 1-12, 
1925. 
Stations 2861; 4679; 4687; 4715. Identified by Sars from the 
last three Albatross stations and from 20 Monaco stations. The 
female was fully described and figured in the Monaco plankton; the 
male remains unknown. The original type specimens came from 
the Bay of Biscay. The present specimens are the first to be re- 
ported since then, as well as the first from the Pacific Ocean. 
Genus PSEUDOCALANUS Boeck, 1872 
PSEUDOCALANUS MINUTUS (Krgyer) 
Calanus minutus Kr¢gYErR, Naturh. Tidsskr. Kjgbenhavn, ser. 2, vol. 2, p. 548, 
1848. 
Stations 4; 8; 10; 11; 18-16; 20-25; 29; 338-36; 41; 46; 52; 53; 
55; 59-62; 64; 66; 68; 70; 71; 73; 76; 3681; 3705; 3789; 3799; 3800; 
