304. BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
and a third as long and 2-segmented. Genital segment twice as long 
as the abdomen, with a long fingerlike process at the center of the 
ventral surface curved backward. The segment is covered with a dor- 
sal carapace, which has a large tooth on the left margin pointing 
backward. The carapace is prolonged over the abdomen and almost 
reaches the posterior margin of the latter. The single abdominal seg- 
ment is very short, but as wide and as thick as the genital segment. 
The caudal rami are attached on a level with the dorsal surface of 
the abdomen, and the left one is larger than the right. 
The first antennae are rather slender and reach to the end of the 
third thoracic segment. The exopod of the second antenna is very 
slender and scarcely half as long as the endopod. There is a small 
spherical eye on the ventral surface just behind the rostrum that has 
a deep red color in the preserved specimens. Each ramus of the first 
legs is 8-segmented, the endopod reaching the distal end of the second 
exopod segment. The outer spines on the three exopod segments 
are long, slender, and acuminate; the terminal spine of the end segment 
is very short and weak. The inner setae on the segments of the 
endopod number 1, 2, and 6, respectively, while those on the exopod 
number 0,1, and 5. The fifth legs are very large for the size of the 
copepod; the endopod is bifurcate for a third of its length, the branches 
rather blunt. The exopod is thickened at its base and three times 
as long as the endopod, with three small spines on its outer margin, a 
jarge one at its tip and a larger one still on the inner margin some 
distance from the tip. Total length 3mm. Metasome 2.25 mm. long, 
1 mm. wide. 
Types.—U.S.N.M. No. 74136: station 4009, latitude 21°50’30”’ N., 
longitude 159°15’ W., Hawaiian Islands. 
Remarks.—This species is distinguished by its robust form, by the 
tooth on the left side of the dorsal carapace and the fingerlike process 
at the center of the ventral surface of the genital segment. It is 
evidently quite restricted in its distribution. 
PONTELLOPSIS ARMATA (Giesbrecht) 
PLATE 30, Fiaures 450-452 
Monops armatus Giesprecut, Atti Accad. Lincei, Rome, ser. 4, vol. 5, sem. 2, 
p. 28, 1889; Fauna und Flora des Golfes von Neapel, monogr. 19, pp. 487, 
496, pl. 26, figs. 19, 26, 27 ; pl. 41, figs. 46, 47, 58, 1892. 
Sations 16; 2937; 3822; 8878; 4009; 4010; 4190; 5129; 5175; 5186; 
5223 ; 5228; 5234; 5340; 5382; 5422. Nstablished by Giesbrecht upon 
specimens obtained east of the Philippine Islands and found in the 
Albatross plankton well distributed among the islands themselves. 
Present also in the Siboga and Carnegie planktons. Giesbrecht gave 
