NO. 3570 PANDARIDAE — CRESSET 59 



it is specific to that host. It was reported by Wilson (1907) from the 

 pectoral and ventral fins of the host. 



Genus Nesippus Heller, 1868 



Nesippus Heller, 1868, p. 193. [Type-species: A''. orientaUs.] 

 Nogagus. — Beneden, 1892b, p. 246. [Refers to N. augustatus only.] 



Female. — Frontal plate distinctly separate. First thoracic seg- 

 ment fused with cephalon. Thoracic segments 2-4 free. Dorsal 

 plate may or may not be present on segment 4. Abdomen 1-seg- 

 mented and joined to genital segment ventrally. Caudal rami at- 

 tached distally to abdomen. Adhesion pads present on cephalon. 

 First antenna 2-segmented. Oral appendages of usual pandarid type. 

 Maxilliped with a claw pointed or rounded at tip. Legs 1-4 bu-amose. 

 Rami of legs 1-3 2-segmented, those of leg 4 1-segmented. Leg 5 

 reduced to 1 or 2 setae. Leg 6 absent. Egg strings straight. 



Male. — The same generic characters of female with following 

 exceptions. A reduced modification on endopod of leg 3. Leg 6 

 present but much reduced. Abdomen 1-segmented. The males of 

 this genus can be separated from all other pandarids by the 1-seg- 

 mented abdomen. 



Discussion.- — -Members of this genus seem to be restricted to inshore 

 species of sharks and are generally not found on the body surface of 

 the host. The usual sites of infestation are the mouth, gill arches, 

 and nasal passages. 



Three species of copepods have been described and assigned to the 

 genus Nesijj-pus that are now certainly not members of this genus: 

 Nesippus curticaudis Dana, 1852, N. borealis Steenstrup and Lutken, 

 1861, and A^. bengalensis, Gnanamuthu, 1949. These are described 

 as males of this genus. On the basis of the descriptions of the males 

 of 2 species of Nesippus in this paper, it has been shown that the above 

 3 species are not males of this genus. None of these species shows 

 any indication of sexual maturity. None has been reported in copu- 

 lation with a female. All have been reported from the plankton. 

 These 3 species, therefore, should be removed from this genus. Their 

 taxonomic position remains in doubt owing to the fact that they 

 appear to be immature. It cannot be established that they are even 

 members of the family Pandaridae. 



Key to Adult Females of Genus Nesippus 



1. Endopod of leg 4 unarmed 2 



Endopod of leg 4 with long se'lac 3 



2. Genital segment conspicuously narrowed anteriorly', caudal rami with promi- 



nent setae crypturus 



