498 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



Genus LAKOTA," new. 



Lateral angles of head prominent, antennae of the usual form. Epis- 

 tome not prominent. Upper lip projecting as a prominent rounded 

 lamina far beyond the epistome. Mandible with well developed palp 

 situated opposite the rather small pointed molar, which is nearer the 

 distal than the proximal end. First maxilla? with the blunt end of 

 the inner plate furnished with two plumose setae; outer plate oblique 

 distally where it is furnished with several spine teeth; palp two- 

 jointed, the distal end widened and furnished with several teeth. Sec- 

 ond maxilla 1 with the lobes rather broadly oblong, setose on the tip 

 and inner margin ; inner plate shorter than the outer. Maxillipeds 

 with the inner plates short and broad; outer plates not extending be- 

 yond the second joint of the palp, the margin devoid of spines but 

 furnished with small nodular denticles. Side plates deep. First 

 gnathopods subchelate; carpus rather long; hand about as wide as 

 carpus with a nearly transverse palm. Second gnathopods with the 

 hand rather narrow, and not produced at the lower angle. Last two 

 peraeopods rather slender, of nearly equal length, with broad basal 

 joints. Branchiae simple. Infero-posterior angle of third abdominal 

 segment produced. Terminal uropods projecting beyond the others, 

 the rami subequal, flattened, lanceolate, furnished with lateral spines 

 and seta?. Telson oblong, deeply cleft. 



Type of the genus. — L. carinata, new species. 



This genus is allied to Tryphosa, but differs in that the epistome 

 is not projecting, and in having shorter inner and outer plates in the 

 maxillipeds. From Chironesimus, which it resembles, among other 

 things, in the character of the upper lip it differs in having a nar- 

 rower hand in the second gnathopods which is not widened distally. 

 and in having the carpus in the first gnathopods no wider than the 

 hand. 



LAKOTA CARINATA, new species. 



Eyes oblong, light brownish in alcohol. Anterior angle of head 

 acute, about reaching the tip of the tirst joint of the first antennae. 

 First antenna' short, the secondary flagellum with four joints, of 

 which the first is elongate. Second antennae about a third the length 

 of the body. Outer plate of first maxilla' with about ten spine teeth 

 and a tuft of seta' at the inner end of the oblique distal margin : apical 

 margin of palp with about eight short teeth. Inner plate of maxilli- 

 peds with several plumose seta' in inner margin; outer plate with few 

 seta?. 



First gnathopods with the side plates somewhat widened distally, 

 hand as wide and nearly as long as the carpus, subrectangular, the 



No etymology. 



