10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



12°38'S, 54°40'E; 04°09'S, 74°58'E; 03°54'N, 74°59'E). Two collec- 

 tions from E. floridanus (07°17'N, 55°00'E; 00°14'S, 55°04'E). 

 Pacific Ocean: from Carcharinus malpeloensis (Fowler) (9°42'N, 

 85°46'W), Carcharinus galapagemis (14°3'N, 92°8'W) and Sphyrna 

 zygaena (Linnaeus) off Formosa. Also 1 collection from P. longimanus 

 from Dm-ban, South Africa, and 4 collections from this host in the 

 Gulf of Mexico. Two collections from Galeocerdo cuvier (Lesueur), 1 

 from Formosa and the other from Pointe Noire, West Africa. 



Female. — ^Body form as in figure 27. Length 8.4 mm and width 

 (measured at the widest part) 4.6 mm. Based on an average of 10 

 specimens. 



In general, dorsal xiew and arrangement of thoracic plates of 

 female is same as P. satyrus with the following exception: caudal ramus 

 (fig. 28) of P. cranchii always extends to distal tip of abdominal 

 plate and often even beyond while ramus of P. satyrus is much shorter 

 in relation to abdominal plate (see fig. 2). Ramus of P. cranchii 

 measures 1.4 mm in length. 



Oral area as in P. satyrus except that maxilHped (fig. 29) of P. 

 cranchii possesses a larger basal segment. Leg 1-4 with spine and 

 setal formula as P. satyrus. Endopodite of leg 2 of P. cranchii 

 (fig. 30) with patch of more rugose spines along outer edge than that 

 of P. satyrus. Leg 5 (fig. 31) as in P. satyrus. Eggs and egg strings as 

 in P. satyrus. 



Color as in P. satyrus. 



Male. — ^Body form as in P. satyrus. Total length 10.4 mm. 

 Greatest width 5.2 mm, based on an average of 10 specimens. Male of 

 P. cranchii differs from P. satyrus as follows: second antenna of P. 

 cranchii (fig. 32) with smaller claw; posterior corners of genital 

 segment of P. cranchii attenuated but not curved inwardly as in 

 satyrus (see fig. 33). 



Discussion. — This copepod appears to be closely related to P. 

 satyrus but the two species are easily separated on the basis of the 

 caudal rami. The rami of P. cranchii extend at least to the tip of the 

 abdominal plate (often beyond) whereas the rami of P. satyrus extends 

 only about haK the length of the abdominal plate. The legs of P. 

 cranchii have the same spine and setal formula but the patches of 

 spinules are much hea^^ier in P. cranchii. 



Pandurus cranchii seems to be confined primarily to carcharinid 

 sharks. It is also common on the tiger shark, Galeocerdo cuvier. The 

 parasite is found on the body surface of the host and hke other mem- 

 bers of the genus is sometimes found in large clusters on the fins. 

 It is world^vide in distribution. 



Shiino (1954) has described and figured both sexes of this species 

 under the name of P. satyrus. 



