NO. 1573. PARASITIC COPEFODS— WILSON. ■ 379 



reach a level with the lateral margins of the abdomen. Of the repro- 

 ductive organs, the cement glands are large and of the usual shape; 

 they reach from the base of the sixth segment nearly to the anterior 

 margin of the genital segment; the anterior ends are bluntly rounded, 

 while the posterior ones are enlarged and somewhat angular. The 

 semen receptacle is in the form of a semicircle, its ends enlarged and 

 resting against the base of the sixth segment, while the curve is 

 directed forward. The oviducts are each coiled once m the genital 

 segment, the coil passing backward into the posterior lobe, then 

 forward to the anterior margin, and then backward to the vulva 

 which opens just in front of the base of the sixth segment on either 

 side. 



Total length, 32 mm. ; length of carapace on mid-line, 7 mm. ; 

 width of same, 10 mm.; length of tliird dorsal ])lates, 6 mm.; length 

 of genital segment, 13 mm.; width of same, 7 mm.; length of anal 

 laminae, 5 mm.; length of egg strings, 120 mm. 



Color (preserved material) a dark yellow tinged with brown, but 

 without pigment markings. 



{ferox, ferocious.) 



Steenstrup and Liitken state that if it can be fairly proved that the 

 present species and Nogagus grandis live in the same region, then it 

 will be reasonably certain that they are the male and female of the 

 same species (1861, p. 387). 



After careful examination this does not seem probable for the 

 following reasons: First, Nogagus grmidis is not like the Dinematura 

 males already determined in that its second and third legs are two- 

 jointed instead of three-jointed, and its second maxillipeds are of the 

 ordinary form instead of swollen. 



In the second place, it is like the male form named Caligus para- 

 doxus by Otto in 1828, and corresponds, in the structure of its append- 

 ages, with the female form presented at the same time and afterwards 

 (1865) used by Heller as the type of his new genus Demoleus. For 

 these reasons Nogagus grandis has been placed with the genus Demo- 

 leus (see p. 349). 



The collection of the U. S. National Museum includes two lots of 

 this species; one numbered 12036 and containing more than tliirty 

 females excellently preserved was obtained from the shark fishermen 

 of Iceland; the other. Cat. No. 32783, contains six well-preserved 

 females whose origin and host are unknown. 



