350 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxm. 



They differ from all the other Nogaus types here given in their size, 

 being from 13 to 16.5 mm. in length; in the relative size of the third 

 thorax segment, which is much the smallest of the three free segments; 

 in the semilunar shape of the fourth segment; in the segmentation 

 of the abdomen, each joint of which is considerably wider than long, 

 and in the huge size of the anal laminse, which, however, are armed 

 with very small and rudimentary setae. These considerations render 

 it fairly certain that Nogagus grandis is the male of Demoleus jMra- 

 doxus, and we may revise the genus diagnosis as follows to include 

 both sexes: 



Female. — Carapace orbicular, about one-third the entire length; 

 frontal plates narrow and distinct ; eyes close together. Second and 

 third thorax segments of the same width and just filling the space 

 between the posterior lobes of the carapace; second segment with 

 small lateral lobes; fourth segment less than half the width of the 

 other two, and carrying a pair of small dorsal plates. Genital segment 

 elongate, more than twice as long as wide, deeply incised posteriorly, 

 with evenly rounded lobes. Sixth segment separated in the form of 

 a circular plate concealed between the genital segment and the abdo- 

 men. Abdomen minute, triangular, and entirely concealed in dorsal 

 view; anal lamina? very large, projecting beyond the posterior margin 

 of the genital segment, but armed with small and rudimentary setae. 

 Second antennae small, with a weak terminal claw; second maxillipeds 

 with a medium-sized claw. All the swimming legs biramose, the rami 

 two-jointed and armed with plumose setae; basal joints of the first 

 and fourth pairs small, of the second and third pairs enlarged and 

 lamellar. Egg-strings looped once so as to give three strands. 



Male. — Carapace similar to that of the female, about half the entire 

 length; a pair of minute accessory lobes on the posterior border, just 

 inside the posterior lobes. Lateral lobes on second thorax segment 

 like those in the female; fourth segment without dorsal plates. Gen- 

 ital segment elongate, with short and well-rounded posterior lobes, 

 but with no legs visible in dorsal view. Abdomen two-jointed, 

 terminal joint the wider; anal laminae huge, but armed as in the 

 female with small and rudimentary setae. Second maxillipeds not 

 much swollen and armed with ordinary terminal claws. All the 

 swimming legs biramose, the rami two-jointed and armed w^ith large 

 plumose setae. 



{DeTnoleus, a Greek slain by ^neas before Troy.) 



Genus GANGLIOPUS Gerstaecker. 



Gangliopus pyriformis Gerstaecker, 1854, p. 192, pi. vii, figs. 9-16. 

 Nogagus angustulus Gerstaecker, 1854, p. 193, pi. vii, figs. 17, 18. 



Both sexes of this genus were obtained together from the gill 

 arches of a shark captured on the west coast of Africa, and were 

 described by Gerstaecker in 1854. He recognized the female as the 



