COPEPODS OF THE WOODS HOLE REGION 135 



Male. — As large as female or larger ; urosome relatively longer and 

 symmetrical; second inner caudal seta of left ramus as in female; 

 second basipod of right fifth leg with a straight fingerlike process, 

 covered with stiff hairs, at its inner distal corner ; second segment of 

 exopod swollen into a globular protuberance covered with minute 

 spines; second basipod of left fifth leg with a convex inner margin 

 fringed with short hairs. Total length, 3-3.25 mm. 



Remarks. — The exceptional length of the first antennae and the 

 elongated caudal seta are the distinguishing characters. This is ap- 

 parently a deep-water form and does not come into shallow water or 

 near the surface. 



Genus AUGAPTILUS Giesbrecht, 1889 



Head separated from the first segment; fourth and fifth segments 

 fused with rounded corners; urosome 3-segmented in female, 5-seg- 

 mented in male; genital segment usually somewhat asymmetrical in 

 female ; rami of all five pairs of legs 3-segmented, the fifth pair 

 natatory like the others; grasping antenna of the male sometimes 

 on the right, sometimes on the left side. One species found here. 



AUGAPTILUS FILIGERUS (Glaus) 



Figure 92 



Hemicalanus filigerus Claus, Die frei lebenden Copepoden, p. 179, 1863. 

 Augaptilus filigerus Giesbrecht, Fauna uud Flora des Golfes von Neapel, vol. 

 19, p. 400, pis. 3, 27, 28, 29, 39, 1892. 



Occurrence. — Two males and one female from trawl wings. Sta- 

 tions 2219, 2230, Albatross, south of Long Island. 



Distribution. — Mediterranean (Giesbrecht, Pesta) ; North Atlantic 

 (van Breeman) ; Messina (Claus) ; Adriatic (Pesta) ; South Atlantic 

 (Wolfenden) ; Malay Archipelago (A. Scott). 



Color. — Body transparent, the second and third thoracic seg- 

 ments with a wash of green, the plumose setae on the antennae, the 

 mouth parts, and the caudal rami much elongated, especially in the 

 male, and tinged with reddish brown distally, the color becoming 

 pronounced at the tips. A pair of small red globules in the second 

 segment of the thorax ; no eye visible. 



Female. — Genital segment protruding ventrally and twisted to 

 the left asymmetrically; caudal rami slightly longer than wide; first 

 antennae reaching six to eight segments beyond the caudal rami; 

 exopod of second antenna less than half as long as endopod; outer 

 seta on second basipod of fifth legs twice as long as the whole 

 exopod; inner apical seta of latter considerably longer than the end 

 segment. Total length, 4.5^.9 mm. 



