COPEPODS GATHERED BY ALBATROSS—WILSON 203 
Stations 4758; 5120; 5185; 5190; 5320. Established by A. Scott as 
Aetideus bradyi in the Siboga plankton, but in the Monaco plankton 
transferred by Sars to his new genus Huaetideus together with other 
specimens “Obtenue pendant l’Expedition de l’ Albatross dans Océan 
Pacifique, mais non encore décrite.” At first Sars regarded these 
specimens as a new species, the third for his new genus, and made 
drawings of them labeled with a new specific name. But afterward 
he evidently changed his decision, drew a line through the new name, 
and wrote above it the name of the present species. This explains 
the above quotation from the Monaco plankton and also the fact 
that no third species of the new genus has ever appeared. All Scott’s 
specimens were females and so were those that Sars made the type 
species of his new genus. The Albatross collections however include 
males as well as females, and the former sex is here described for the 
first time, from Station 4758. 
Male.—Head fused with the first segment into an elongate cephal- 
othorax like that of the female. A similar hard and horny rostrum 
is present, but there is no knoblike frontal projection or any crest. 
The last thoracic segment is produced into chitinized spines, which 
reach the posterior margin of the first abdominal segment and are 
curved slightly outward. The urosome is 4-segmented; the genital 
segment is one-half wider than long; the middle abdominal segment is 
longer than either of the other two. The caudal rami are longer 
than the anal segment and slightly divergent, three times as long as 
wide, each with four plumose and one appendicular setae. 
The antennae, mouth parts, and first four pairs of legs are like 
those of the female. Only one fifth leg, the left, is present, as in the 
males of the genus Aetideus, and this leg is uniramose and 5-seg- 
mented. The third segment is the longest and the terminal segment 
the shortest, and the only armature is four or five minute filose setae 
on the end segment. Total Jength 1.50 mm. Metasome 1.40 mm. 
long, 0.56 mm. wide. 
Allotype male.—U.S.N.M. No. 70757; station 4758: latitude 52°02’ 
N., longitude 132°53’ W., off Queen Charlotte Islands. 
Remarks.—This is the first male to be reported for Sars’ new genus, 
and since the rostrum is fully as massive as in the female and the 
spines at the posterior corners of the metasome are half as long as 
the urosome it fully supplements the distinctive characters of the 
genus and helps to validate its separation from the genus Aetideus. 
The species was reported in the Carnegie list from the eastern Pacific. 
EUAETIDEUS GIESBRECHTI (Cleve) 
Aetideus giesbrechti Cinve, Marine investigations in South Africa, vol. 3 (1905), 
Copepoda, p. 185, 1904. 
