COPEPODS OF THE WOODS HOLE REGION" 225 



black; between the distal one of these spines and the basal endopod 

 segment is a fourth spine, much longer, bluntly pointed, minutely 

 denticulate along its outer margin, and light colored. In the second 

 legs the two basal exopod segments are much produced at the distal 

 corners, and carry an outer fringe of coarse spinules; the apical 

 spine of the end segment is acuminate at its tip and pectinate along 

 its outer margni. The endopod is much shorter than the exopod 

 and is tipped with a long apical spine, enlarged at its distal end and 

 divided into a blunt thumb and two curved fingers, whence the 

 specific name. There are also two outer spines, the proximal one 

 much wider and laminate at its base. In the fifth legs the distal 

 segment is as wide as long, narrowed at its tip, with a single apical 

 filiform seta, a short spine on the outer margin, two unequal 

 plumose setae and two minute spines on the inner margin. The 

 two basal expansions are fused for half their length on the midline ; 

 the free portion is narrow, squarely truncated at the tip and armed 

 with two coarse plumose setae. Total length, 0.7-0.8 mm. 



Rcmarhs. — The female can be identified by the structure of the 

 first and fifth legs and by the curious spermatophore on the ventral 

 surface of the genital segment; the fifth legs and the endopod of 

 the second legs are the best characters in the male. 



AMPHIASCUS HISPIDUS (Brady) 

 FiGTJRB 151 



Stenhelia hispida Brady. A monograph of the free and semiparasitic Copepoda 

 of the British Islands, vol. 2, p. 32, pi. 42, figs. 1-14, ISSO. 



Amphiascus hispidus Sabs, Crustacea of Norway, vol. 5, p. 166, pis. 107, 108, 

 1906. 



Occurrenee. — Found among algae in the Eel Pond, Woods Hole, 

 June, 1925 ; in Penzance Pond, Woods Hole, August, 1925 ; in Poucha 

 Pond, Chappaquiddick Island, and Katama Bay, Marthas Vineyard, 

 July, 1925. 



IHstnhutlon. — British Isles (Brady) ; Norwegian coast (Sars). 



Color. — Body yellowish gray, the bases of the antennae, the mouth 

 parts, the swimming legs, and the caudal rami darkened almost to 

 black; eye dull red. 



Female. — Body nearly five times as long as wide; cephalic seg- 

 ment considerably shorter than the rest of the metasome; urosome 

 nearly as long as metasome ; genital segment distinctly divided, and, 

 with the first two abdominal segments, armed laterally with an 

 oblique row of spinules near the posterior margin; caudal rami 

 distinctly longer than Avide, the outer apical seta swollen at its base. 



First antennae 8-segmented, the two basal segments enlarged ; 

 exopod of first legs longer than the basal endopod segment, middle 

 segment without an inner seta; end segment of third exopod with 



