COPEPODS OF THE WOODS HOLE REGION 



435 



each with three apical setae and one on the inner margin, some dis- 

 tance from the apex. Total length, 7-8 nmi. 



Remarks. — The common sand shark is the chief host, but this spe- 

 cies is likely to be found on any of the larger sharks. The complete 

 separation of the dorsal plates of the third segment and the row of 

 coarse, blunt teeth across the posterior margin of the carapace are 

 the best identification characters. 



PANDARUS CRANCHII Leach 



FlGXTEE 273 



Pandarus cranchii Leiach, Dictionnaire des sciences naturelles, vol. 14, p. 535. 

 1819.— Wilson, Proc. U. S. Nat. Mus., vol. 33, p. 403, pi. 28, 1907. 



Occurrence. — Found on the fins of the dusky shark, the brown 

 shark, and several other large sharks that were not identified. 



Distribution.— Gu\i of Guinea (Leach, Desmarest) ; North Atlan- 

 tic (Steenstrup and Liitken) ; south of Long Island (Smith) ; Cape 

 Verde Islands (Brian) ; Stations 2237 and 2422, Albatross (Rath- 

 bun) ; Great South Bay, Long 

 Island (Wilson) ; between Papua 

 and Japan (Brady). 



Color. — Female a light brown- 

 ish yellow, in the fully matured 

 adult usually covered with 

 brownish-black pigment over the 

 entire dorsal surface, except the 

 frontal plates, the margins of the 

 carapace, dorsal plates, and geni- 

 tal segment, and in the center of 

 the sixth segment plate. Male 

 yellowish horn color and fairly 

 transparent, with reddish eyes. 



Female. — Carapace wider than 

 long, the posterior margin be- 

 tween the lobes with a roAv of stout sharp spines. Dorsal plates of 

 second segment large, reaching beyond the center of the plates on 

 the fourth segment; plates on third segment short, with a shallow 

 median sinus; plates on fourth segment covering three-fourths of 

 the genital segment, or often more. Genital segment obovate, 

 strongly narrowed posteriorly, with triangular posterior lobes ; sixth 

 segment plate longer than wide, contracted anteriorly; caudal rami 

 longer than sixth plate and widely divergent. Total length, 6-8 mm. 



Male. — Carapace wider than long, posterior lobes curved inward, 

 accessory lobes longer than wide ; second, third, and fourth segments 

 about the same length and width, the fourth segment a trifle nar- 



FiGDRE 273. — Pandarus cranchii: a. Female, 

 dorsal ; b, male, dorsal (drawn by Emer- 

 ton) 



