COPEPODS OF THE WOODS HOLE REGION 



447 



Distribution. — European seas (Abildgaard, Risso, Leach, Kr0yer) ; 

 British Isles (Baird, T. Scott) ; New Zealand (Thomson) ; Vineyard 

 Sound (Gould, Eathbun, Wilson) ; California coast, Japan, Van- 

 couver Island (U. S. National Museum). 



Color. — Carapace dark brown in the center, paler and yellowish 

 on the edges ; dorsal plates and f oliaceous legs grayish white, covered 

 with minute transparent dots; free thorax, genital segment and 

 abdomen dark yellowish brown. 



Female. — Antennal area separated from rest of head by a dorsal 

 groove; carapace projecting backward over the free thorax and over- 

 lapping the genital segment. Ab- 

 domen attached to the ventral 

 surface of genital segment below 

 and in front of the bases of the 

 Qgg strings; caudal rami fleshy 

 and longer than the abdomen. 

 The tip of the terminal claw of 

 the second antenna, when closed, 

 interlocks with a stout peg on the 

 ventral surface of the second seg- 

 ment, forming a sort of chela. 

 Total length, 10-15 mm. 



M ale. — Carapace relatively 

 longer and narrower than in the 

 female; dorsal plates of fourth 

 segment lacking so that the entire body behind the carapace is visible 

 in dorsal view. Each leg of the first two pairs is notched on its inner 

 margin, and carries in the notch a pair of 1-segmented rami, unarmed 

 except the exopod of the second leg. Total length, 8-10 mm. 



Remarks. — The favorite location of this shark parasite is in the 

 throat, fastened to one of the gill arches, and it is likely to be found 

 on almost any large shark in addition to those here mentioned. 



Genus LERNANTHROPUS Blainville, 1822 



Female. — Head fused with first segment, carapace margins turned 

 down ventrally ; free segments fused and covered with a single dorsal 

 plate, prolonged backward over the genital segment and abdomen. 

 Genital segment small, with convex sides ; abdomen 1- or 2-segmented. 

 Second antennae and maxillipeds prehensile and uncinate ; first four 

 pairs of legs biramose; rami of first and second pairs rudimentary 

 and 1-segmented, of third pair lamellar and fused, projecting at 

 right angles or diagonally from the ventral surface, of the fourth 

 pair lamellar, separate, and extending backward; fifth legs, when 

 present, uniramose and lamellar, often lacking. 



FiGDRE 281. — Anthosoma crassum: a. Fe- 

 male, dorsal ; h, male, dorsal 



