66 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



sixth segments of the thorax subequal and each about one-half mm. 

 longer than any of the other segments, which are about subequal, 

 and in having the second article of the palp of the maxillipeds quad- 

 rate and as large as the lirst article of the palp. 



Fig. 50.— Cyathura carinata (After Norman and Stebbing). a, First gnathopod. 6, Lower 



ANTENNA. C, MAXILLIPED. rf, LABIUM, e, FIRST MAXILLA. /, END OF TELSON. fir, UPPER ANTENNA. 



A, Mandible and palp. 



14. Genus PTILANTHURA« Harger. 



First live segments of abdomen distinct in the female and in the male. 

 The Hagella of both pairs of antenna in the female are composed of 

 only a few articles. In the male, the first pair has a nmltiarticulate 

 flagellum. The maxillipeds have a palp of one article, which is broad 

 and flattened and similar to the basal article; epignath small, rounded. 

 Labium terminating in two broadly rounded lobes. First maxillae ter- 

 minating in well-developed teeth. Mandibles with a palp composed of 

 a single article. 



PTILANTHURA TENUIS Harger. & 



Ptilanthura tenuis Harger, Am. Jour. Sci. (3), XV, 1878, p. 377; Proc. U. S. 

 Nat. Mns., 1879, II, p. 62; Report U. S. Commissioner of Fish and Fisheries, 

 1880, Pt. 6, pp. 406-408, pis. xi, xii, figs. 71-74. 



« See Harger, Report II. S. Commissioner of Fish and Fisheries, 1880, Pt. 6, pp. 

 405-406, for characters of genus. 



^See Harger for complete description of this species. 



