PANDARIDAE— CRESSET 35 



be desirable to clarify this situation. It may be that future de- 

 scriptions will warrant resurrecting some of the previously described 

 species but, on the basis of existing descriptions, this is not justified. 

 So far, this species has been reported from a number of inshore 

 species of sharks, especially of the genera Triakis and Acanthias. It 

 is a parasite on the body surface of its host. 



Perissopus dentatus Steenstrup and Liitken, 1861 



Figures 162-189 



Perissopus dentatus Steenstrup and Liitken, 1861, p. 393.— Richiardi 1880 



p. 148. 

 Perissopus communis Rathbun, 1887, p. 560. 

 Chlamjjs incisus Beneden, 1892a, p. 227. 

 Perissopus crenatus Leigh-Sharpe, 1930, p. 7. 

 Perissopus manuelensis Gnanamuthu, 1951a, p. 1252. 

 Perissopus travancosiensis Kurian, 1955, p. 108. 

 Perissopus serratus Heegaard, 1962, p. 175. 



Specimen studied.— Five females and 1 male ex Carcharinus 

 milberti from Sarasota, Fla., 1 female ex C. leucas, Sarasota, Fla., 

 4 females ex C. maculipinnis, Sarasota, Fla., and 3 females ex 

 "shark" from Siboga Expedition, 2 females ex Mustelus species 

 Dm'ban, South Africa. 



All descriptions and figures refer to specimens from Carcharinus 

 milberti unless otherwise stated. 



Female.— Body form as in figures 162, 187, 188, and 189. Total 

 length 4.9 mm (based on 1 specimen). Greatest width 3.8 mm 

 (measured at widest part of cephalon) . Frontal plate not completely 

 separated from cephalon. First thoracic segment fused with cephalon. 

 Thoracic segments 2-4 free and with dorsal plates. Plates of segment 

 2 widely separated and extending only to distal tip of plates of seg- 

 ment 3. Plates of segment 4 extending only slightly over proximal 

 portion of genital segment. Genital segment large, comprising 

 about one-half total body length. Shape of genital segment variable 

 (see figs. 162, 187, 188, 189). Abdomen (fig. 163) 1-segmented, nearly 

 hidden in dorsal view. No dorsal plate evident. Caudal rami 

 joined distally to abdomen, articulated on dorsal surface only. Each 

 ramus with 7 short spines along posterior border. 



Oral area of usual pandarid type. Adhesion pads moderately 

 developed and associated with first and second antenna and maxilliped. 

 No pad on outer distal corners of cephalon. First antenna (fig. 164) 

 2-segmented. First segment with 18 spines, armed as in figure. 

 Second segment with 11 naked setae. Second antenna (fig. 165) with 

 small adhesion pad at base, last segment in form of claw with very 

 small spme near base. Tip of claw (fig. 166) with curious hooded 

 appearance. Mouth tube of usual type, labium fringed at tip (fig. 



