gan BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
SCOLECITHRICELLA AUROPECTEN (Giesbrecht) 
PLATE 19, FiGuURE 251; PLATE 34, FicuRes 520-524 
Scolecithrir auropecten GiesprecHT, Fauna und Flora des Golfes von Neapel, 
monogr. 19, pp. 266, 284, pl. 13, figs. 8, 18, 22, 27; pl. 37, figs. 3, 10, 1892. 
Stations 3799; 4011; 4652; 5129; 5180; 5185; 5190; 5229; 5231; 
5233; 5240; 5246; 5263; 5320; 5437; 5553. Established by Giesbrecht 
upon female specimens taken at Naples; reported from the Celebes 
Sea in the Siboga plankton, and from Pacific stations in the Carnegie 
plankton. The first males to be obtained came from these Albatross 
stations and are here described. 
Female.——Metasome elongate-elliptical, two and a half times as long 
as wide; head fused with the first segment, and the fourth with the 
fifth segment, the posterior corners angular. Urosome 4-segmented, 
the three abdominal segments of equal length and width, the genital 
segment longer and wider. First antennae reaching the middle of 
the third thoracic segment; endopod of second antenna longer and 
stouter than the exopod. Fifth legs 2-segmented and tipped with two 
spines, one apical and the other subapical on the inside and longer. 
Length 1.8 mm. 
Male.—Metasome nearly three times as long as wide; head separated 
from the first segment and broadly rounded. Fourth and fifth seg- 
ments incompletely fused, with rounded corners overlapping the gen- 
ital segment. Urosome more than a third as long and as wide as 
the metasome; 5-segmented. Genital segment wider than long, with 
nearly straight sides; the first three abdominal segments about the 
same length and width, the anal segment much shorter. Caudal rami 
a little longer than wide and parallel, each with five short setae. 
First antennae reaching the genital segment, rather slender and 
sparsely setose, neither of them geniculate. Second antennae, mouth 
parts, and first four pairs of legs like those of the female. The two 
fifth legs are unequal in length, the right one considerably the longer 
and slenderer. It is made up of two basipod segments, a 3-segmented 
exopod, and a 1-segmented endopod. The left leg has two short basi- 
pod segments, neither of which is swollen, a long exopod segment with 
a knob at its distal end, and a rounded protuberance at the center of 
the lateral margin. The end segment is more or less laminate, curved, 
and flanked by a curved claw at its base. Total length 1.48 mm. 
Metasome 1.06 mm. long, 0.40 mm. wide. 
Allotype male—U.S.N.M. No. 74153; station 5487, latitude 
15°45’54”" N., longitude 119°42’45’’ E., west coast of Luzén, Philip- 
pine Islands. 
Lemarks.—The males of species in this genus are extremely few in 
number, and a new one makes a welcome addition to our knowledge 
of these copepods. 
