PARASITIC COPEPOD CRUSTACEANS — LEWIS HI 



pads associated with the antennae are not as huge in the Atlantic 

 Coast specimens as they are on the Pacific specmiens. The postoral 

 adhesion pads, in all specimens, gre of a general ovoid shape. The 

 only difference in the thoracic leg armature of the specimens is that 

 the fom-th leg exopodite has 5 small spines in the Japanese spec- 

 imens and 8 in the Atlantic, Pacific Coast, and Hawaiian specimens. 

 This difference does not appear significant inasmuch as most of the 

 margin has nmnerous denticulations in all specunens and the differ- 

 ence between a large denticle and a small spine or spinule is not very 

 great. 



Demoleiis heptapus (Otto, 1821) 



Figures 24a-d, 25a-g, 26a-d 



Caligus heptapus Otto, 1821, p. 15. 



Caligus paradoxus Otto, 1828, p. 352, pi. 22, figs. 5-6. 



Binoculus sexselaceus Nordmann, 1832, p. 32. 



Dinematura sexsetacea. — Burmeister, 1835, p. 331. 



Nogagus [paradoxus] Milne-Edwards, 1840, p. 460 (statement of affinity of C. 



paradoxus Otto with the genus Nogagus, no new combination). 

 Nogagus produclus Gerstaecker, 1853 (in part), p. 64. — Wilson, 1907, p. 441. 

 Nogagus paradoxus. — Steenstrup and Llitken, 1861, p. 369. 

 Demoleus paradoxus. — -Heller, 1865, p. 199, pi. 19, fig.3 . — Cams, 18S5, p. 361. — 



Pearson, 1905, p. 26.— Brian, 1906, p. 50.— WUson, 1907b, p. 349.— Scott 



and Scott, 1913, p. 79, pi. 12, figs. 4-5. 

 Demoleus heptapus. — Dollfus, 1943, p. 1, figs. 1-2. 



Reported host. — Hexanchus griseus. 



Distribution. — Cosmopolitan. 



Material. — One ovigerous female (USNAI 110814) collected by 

 the Hawaii Fish and Game Department from the external surface 

 of a specimen of Hexanchus griseus? captured by longline in approx- 

 imately 100 fathoms of water off Ala Moana, Oahu, Hawaii. 



Measurements. — One ovigerous female: 



(mm.) 



Greatest length, excluding setae 13.86 



Greatest length of cephalothorax 5.04 



Greatest width of cephalothorax 4.90 



Greatest length of genital segment 7.14 



Greatest width of genital segment 3.71 



Greatest length of abdomen 0.84 



Greatest width of abdomen 1.33 



Greatest length of caudal rami, excluding setae 2.87 



Length of egg string 45.78 



Diagnostic description of female. — Cephalothorax (fig. 24a) 

 consisting of cephalic, maxilliped-bearing and fu"st pedigerous seg- 

 ments; frontal region narrow, extending ventrally more than hori- 

 zontally. Posterolateral cephalothoracic regions extending posteri- 

 orly well past median cephalothoracic region, to posterior end of 



