408 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



posterior lobe. Coxal plates 1-4 shallow, increasing consecutively 

 in size, fourth excavate behind. 



Pereon segment 6 with small backward-pointing dorsal carina. 

 Pereon segment 7 with larger dorsal carina. Pleon segments 1 and 

 2 each with strong backward-pointing dorsal carina; segment 3 with 

 small dorsal carina which is scarcely backward pointing. Pleon 

 segments 1 and 2 with lower posterior corner sharply produced, 

 lower margin bearing few spinules; segment 3 with lower posterior 

 corner blunt-angled or without angle and lower margin bearing row 

 of spinules. 



Uropods 1 and 2 reaching back about same distance. Uropod 1, 

 peduncle longer than rami, outer ramus shorter; both peduncle and 

 rami margined with many fine short spines. Uropod 2, peduncle 

 slightly longer than outer ramus, but shorter than inner; both peduncle 

 and rami margined with fine short spines. Uropod 3 not reaching 

 back quite as far as 2 ; peduncle slightly shorter than rami and bearing 

 4 spines on upper margin which are longer than those on rami. Telson 

 reaching to about middle of peduncle of uropod 3, broadly oval, 

 slightly longer than wide, bearing 2 minute apical spinules. Female 

 measures about 13 mm. from front of head to end of uropods. 



Remarks. — Gurjanova's specmiens, 22 in number, were taken on 

 the east coast of Kamchatka, among algae and on fine sand, up to a 

 depth of 60 m. The U.S. National Museum collections contain 12 

 specimens from Bering Island, Commander Islands, 9 of them col- 

 lected by Leonard Stejneger in 1882-83, and 3 specimens collected 

 by N. Grebnitzky on August 6, 1888. 



Family Pleustidae 



Sympleustes cornigera, new species 



Figure 9 



Male. — Head with short rostrum, appearing triangular from 

 above; lateral lobe triangularly produced, with narrow rounding apex; 

 lower corner narrowly, sharply produced; eye large, broadly reniform, 

 rather colorless in alcohol. Antenna 1 much longer than antenna 2; 

 first joint longer than second, which is about twice as long as third; 

 flagellum consisting of about 90 joints, first of which is longest. 



Mandible with rather broad cutting-edge, but without accessory 

 plate; spine-row of about 14 spines (fig. 7c); molar conical with rather 

 small triturating surface; palp about as shown for Sympleustes latipes 

 by Sars (1895, pi. 127, fig. m) {=Stenopleustes, according to Barnard 

 and Given, 1960). Maxilla 1, inner plate broad, without plumose 

 setae, but fringed with fine setules; outer plate armed with 9 spine- 

 teeth; palp armed with distal row of 7 spines and submarginal row 



