COPEPODS OF THE WOODS HOLE REGION 



531 



10 mm. 



Distribution. — Danish coast (Kr0yer, Steenstrup) ; English seas 

 (T. and A. Scott) ^ Greenland (Stephensen). 



Color. — Young females and males a uniform snowy white; older 

 females tinged more or less with brown, the color deepening with 

 age. 



Female. — Cephalothorax a little wider than the trunk, the lateral 

 lobes sometimes enlarged into knobs, sometimes bifid; neck of me- 

 dium Avidth and varying 

 length. Trunk more or less 

 heart-shaped and strongly de- 

 pressed; caudal rami small 

 and laminate or knoblike; 

 posterior processes becoming 

 larger and more profusely 

 branched with age. First 

 and second antennae 3-seg- 

 mented, the basal segment the 

 largest; first maxilla a tiny 

 knob easily overlooked; sec- 

 ond maxilla a dactylose proc- 

 ess tipped with a claw ; max- 

 illipeds with a swollen basal 

 segment and a stout apical 

 claw. Total length, 45-60 mm. 



Male. — First and second 

 antennae 3-segmented, first 

 pair tipped with two stout spines, second pair with three spines; 

 the second segment of the second pair has a wide process on the 

 inner margin armed with three spines. Basal segments of maxilli- 

 peds fused across the midline, terminal segments slender and tipped 

 with chelae. Total length, 2 mm. Greatest width, 1 mm. 



Remarks. — This parasite can be recognized by the widened head 

 and trunk connected by the long and comparatively narrow neck. 



Figure 315. — Sphyrion lumpi: a. Female, dorsal 

 (drawn by Rathbun) ; i, male, lateral 



Family ANTHEACHERIDAE 



Genus PHILICHTHYS Steenstrup, 1862 



Female. — Head separated from first segment, small and rounded, 

 without a carapace; no neck; trunk elongated, narrowed poste- 

 riorly and distinctly segmented, each segment being subdivided and 

 all of them, including the head, furnished with paired lateral and 

 ventral processes, which curve downward and inward. Anterior 

 thorax swollen and orbicular, posterior portion cylindrical and 

 tapered backward; abdomen short and segmented; no caudal rami. 

 Anteimae, mouth parts, aijd swiinming legs entirely lacking. 



