26 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Specimens studied.^ — ^Tliree collections from Prionace glauca in the 

 Indian Ocean (0°58'N, 55°00'E; 0°14'N, 55°00'E; 6°37'S, 55°00'E). 

 Five collections from Prionace glauca at various points in the western 

 North Atlantic. 



Female. — -Body form as in figure 125. Average length of North 

 Atlantic specimens 14.6 mm (based on an average of 5 specimens). 

 Greatest width of North Atlantic specimens 10.3 mm. Average 

 length of Indian Ocean specimens 10.3 mm (based on 4 specimens). 

 Greatest width of Indian Ocean specimens 5.6 mm. Dorsal thoracic 

 plates on segments 2-4. All thoracic plates paired and often greatly 

 inflated in preserved specimens. Genital segment (fig. 126) pear 

 shaped, being widest in posterior third. Abdomen 1-segmented, 

 large, and bearing a dorsal plate that does not cover it when viewed 

 dorsally. Caudal rami as in figure 126 with 4 short spines. 



Oral area without adhesion pads. First antenna 2-segmented, first 

 segment with 22 naked spines and last segment with 12 naked spines. 

 Second antenna (fig. 127) with long terminal claw. When second an- 

 tenna is flattened against oral area, claAV extends posteriorly to maxil- 

 lipeds. Terminal claw bearing 2 short spines. First maxilla (fig. 128) 

 with short stout terminal spine and group of 3 short setae on basal 

 third. Second maxilla (fig. 129) with usual fringed claw and 2 setae at 

 base, 1 large and fringed, other shorter and plumose at tip. Maxil- 

 hped (fig. 130) bearing terminal claw with pointed tip and opposed on 

 penultimate segment by a ridge. 



Legs 1-4 (fig. 131-134) biramous with rami of legs 1-3 2-segmented 

 and those of leg 4 1-segmented. Spine and setal formula as follows: 



seg. 1 

 seg. 2 



Leg 5 (fig. 135) consisting of an inner lobe and single outer seta. 



Egg strings long and each composed of a single strand of disclike 

 eggs. 



Color whitish yellow. 



Male. — Since the male of this copepod has been well figured and 

 described by Monod and Dollfus (1938), only a few salient features 

 will be mentioned here. Body form as in figm-e 136. Oral area as 

 in female with the following differences: second antenna smaller, in 

 relation to rest of oral area, than in female; maxilliped with a claw at 

 tip but opposed by 2 adhesive areas rather than 1 as in female (see 

 Monod and Dollfus, 1938, p. 198, fig. 5). 



Legs 1-4 bu-amose and not as highly modified as in female. Spine 

 and setal formula as follows: 



