PARASITIC COPEPOD CRUSTACEANS — LEWIS 67 



p. 446, fig. 281.— Leigh-Sharpe, 1933, p. 109.— Yamaguti, 1936, p. 12.— 

 Brian, 1944, p. 208, pi. 5, figs. 43-44. — Pontes, 1949 [paper not seen]. — 

 Birkett and Burd, 1952, p. 391, fig. 1 [paper not seen].— Pearse, 1952, p. 28.— 

 Nunes-Ruivo, 1954, p. 19 [paper not seen]. — Barnard, 1955, p. 271, fig. 18. — 

 Shiino, 1955c, p. 51, figs. 1-2; 1957, p. 370.— Heegaard, 1962, p. 181. 

 Otrophesia imbricata. — Risso, 1826, p. 136. 



Reported hosts. — Isurus glaucus, I. oxyrinchus, Carcharias lit- 

 toralis, Lamna cornubica, L. nasus, Mola mola. 



Distribution. — Cosmopolitan. 



Material. — Three ovigerous females and one adult male (USNM 

 11081) collected by the Hawaii Fish and Game Department from the 

 buccal cavity of a specimen of Carcharodoii carcharias captured by 

 long line in Pokai Bay, Hawaii. Four other ovigerous female speci- 

 mens (USNM 11082) taken by E. C. Jones and Kenneth Sherman 

 from the buccal cavity of a "Mackerel Shark" (probably Isurus 

 oxyrhynchus) captured at 45°11'N. and 174°54'W., were used as 

 comparative material in the description. 



Measurements. — Seven female specimens and one male specimen: 



Greatest length 



Greatest length of cephalothorax 



Greatest width of cephalothorax 



Greatest length of genital segment (5 female 



specimens) 

 Greatest width of genital segment (5 female 



specimens) 

 Greatest length of abdomen 

 Approximate length of egg strings (5 female 



specimens) 20. 17. -30. 



Diagnostic description. — Cephalothorax of female (figs. 4a, b) 

 irregularly ovoid from dorsal viewpoint, irregularity due to con- 

 striction of narrow anterior region at approximate division between 

 cephalon and thorax. Dorsal thoracic sm'face covered by carapace- 

 like structure; structure continuous over cephalon except for indistinct 

 groove at constriction and slight depression with indistinct, incomplete 

 groove at anterior end of cephalon. Cephalothorax consisting of 

 cephalic, maxilliped-bearing and first pedigerous segments. Pah- 

 of small, scoop-shaped lappets (fig. 56) present, projecting ventrally 

 and laterally from ventral and ventrolateral cephalothoracic sm'face 

 at constriction in anterior cephalothoracic region. Structures not 

 associated with either antennules or antennae but may be comparable 

 to postantennular adhesion pads of pandarids and postantennal 

 process of trebiids, euryphorids and caligids. Carapace-like covering 

 of cephalothorax heavily sclerotized, providing hood completely 



