392 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



2 lateral teeth; palp 2-jointed. Maxilla 2, inner plate shorter than 

 outer. Maxilliped, inner plate with 3 terminal teeth; outer plate 

 without marginal teeth; palp 4-jointed. Gnathopod 1 chelate. 

 Gnathopod 2 slender, normal. Pereopods 3-5 increasing consecu- 

 tively in length; basipod weU expanded. Pleon segment 3 with 

 lower hind corner sharply upturned. Branchiae plaited on both 

 sides. Telson cleft beyond middle. 



Type-species. — Kyska dalli, new species. 



This new genus is very much like Anonyx, and the type-species bears 

 a close superficial resemblance to Anonyx nugax. The characters that 

 differentiate Kyska from Anonyx are the comparative shortness of 

 the antennae, the lack of calceoli in the male, and the possession of 

 chelate gnathopod 1 in both sexes ; otherwise, the characters of Kyska 

 are the same as those given by Stebbing (1906) for Anonyx. 



Kyska dalli, new species 



Figure 1 



Male. — Eye black, pyriform. Antenna 1 about as long as head and 

 pereon segment 1 combined, about % as long as antenna 2 ; first joint 

 large, second and third joints very short; flagellum about as long as 

 peduncle, composed of 17 joints; accessory flagellum }^ as long as 

 primary and composed of 9-10 joints. Antenna 2, fourth joint 

 slightly longer than fifth, flagellum longer than peduncle and composed 

 of about 28-30 joints. Epistome not projecting beyond upper lip. 

 Other mouthparts as shown in figures. 



Coxal plate 1 expanded below, projecting slightly forward. Gna- 

 thopod 1, second joint about as long as remaining joints combined; 

 fifth joint short, cup-shaped; sixth joint greatly developed, lower 

 distal end produced forward, forming chela with short, curved, oppos- 

 ing seventh joint (figs. la,h). Gnathopod 2 normal. 



Pereopods 1 and 2 similar, subequal in length. Pereopods 3-5 

 rather long, slender, increasing in length consecutively; second joints 

 considerably expanded; fourth joint well expanded in pereopod 3, 

 less expanded in pereopods 4 and 5. Seventh joint in all pereopods 

 long, slightly curved. 



Pleon segment 1, lower hind corner not produced; segment 2 rather 

 sharply produced; segment 3 sharply upturned. Urosome segment 1 

 with slight dorsal depression. Uropod 1 reaching back farther than 

 uropod 2, about as far as uropod 3. Uropod 3, outer ramus longer than 

 inner and with small second joint. All uropods bearing only few short 

 spinules. Telson cleft nearly to base, reaching back slightly beyond 

 peduncle of uropod 3. 



Gills plaited on both sides. Gill of pereopods 1 and 2 v/ith ap- 

 pendage, that of pereopods 3 and 4 with pointed finger-like appendage. 



