498 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 67. 



specimens) creamy yellowish with minute black dots sparsely scat- 

 tered on the body and more densely so on the dorsal surface of the 

 head. Irregular carinations on the various segments give the dorsal 

 surface of the body a rugged aspect. 



Head small, and subtriangulate, convex, 3.1 mm. long, 3.5 mm. 

 wide, frontal margins slightly rounded and posterior margin strongly 

 rounded. Eyes shining black, subovate, moderately large, 1 mm. 

 long, placed obliquely in the anterolateral angles of the head, and 

 separated from each other at their nearest point by a distance of 2 

 mm., being distinctly more elongate and different in contour from the 

 eyes of /. japonensis. First antennae short, consisting of 8 articles 

 and extending slightly beyond the anterior end of the eye. The 

 second antenna consists of 10 articles and extends quite to the pos- 

 terior margin of the head. 



A comparative diagnosis of the maxillipeds of the present species 

 and its closest ally, /. japonensis Richardson,^ seems desirable, es- 

 pecially since the author made no mention of the mouth parts in her 

 discussion of japonensis. In geei the maxilliped is relatively quite 

 short, its distal margin having the upper two-thirds of both lobes 

 of the first maxilla entirely exposed while in japonensis the space be- 

 tween the anterior lip and the tip of the palp of the maxilliped is 

 quite small and the outer margin of the masticatory lobe is produced 

 beyond the margin of the epistome and the respective margins along 

 the incision bilobating the lower lateral region are greatly roundly 

 produced and overlap. Thus in japonensis the maxilliped covers the 

 entire underlying mouth parts except the very tips of the maxillae, 

 which are barely visible, and the distal ends of the palp, which meet 

 above the epistome. In geei the maxillipeds are much broader in the 

 basal region, with the bilobation of the masticatory lobe which oc- 

 curs in the upper outer median lateral area marked by a distinct ex- 

 cavation, and the upper part of the lobe is not greatly produced, the 

 inner area being relatively truncate. The palp is well developed and 

 extends quite beyond the anterior margin of the masticatory lobe. 

 The distal joint of the palp is well developed in marked contrast to 

 that of japonensis, which is rudimentary, almost obsolete. The entire 

 palp of japonensis is relatively small and overshadowed by the pro- 

 duced masticatory lobe. 



Thorax roundly ovate, strongly convex, moderately asymmetrical. 

 First segment 3 mm. long in median line, 9 mm. wide, with anterior 

 margin deeply roundly excavate surrounding the posterior margin of 

 the head. The lateral margins have the anterior half produced ante- 

 rolaterally beyond the angles of the head and the posterior half directed 

 almost straight back ; the posterior margin is also relatively a straight 



» Ichthyowenus japonensis Richardson, Proc U. S. Nat. Mus., vol. 45, No. 1995, vol. 45, 

 pp. 561-562, text figs. 4-6. 



