402 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



about 6 setae, and with rather deep angular sinus near apex (fig. 5h). 

 Gnathopod 2, second joint not as long as fifth and sixth combined; 

 third, fourth, and fifth joints about equal in length, third bearing 

 small downward-projecting angular lobe; sixth joint twice length of 

 fifth, about twice as long as wide, expanding slightly distally; palm 

 oblique, convex, finely crenulate throughout, defined by rather blunt 

 tooth and 2 spines (fig. 5j); seventh joint stout, curved, fitting palm. 



Pereopods 1 and 2 slender, pereopod 1 slightly longer (fig. 5k). Pere- 

 opods 3-5 alike, 4 slightly the longest; second joint linear. Uropod 

 1 reaching posteriorly farther than 2, 2 farther than 3. Peduncles 

 of all uropods with many fine, closely set spines. Uropod 1, outer 

 ramus with 5 marginal spines; inner ramus with 3 marginal spines. 

 Uropod 2, outer ramus with 4 marginal spines; inner ramus with 3. 

 Uropod 3, peduncle armed with row of short spines on upper outer 

 margin; first joint of ramus with 1 median, 1 distal spine. No ter- 

 minal spines on any rami. Telson long, narrow, reaching back about 

 Ys length of peduncle of uropod 3, and bearing row of 7-8 spinules on 

 either lateral margin. Length, from front of head to end of uropods, 

 about 13 mm. 



HoLOTYPE.— Male, USNM 95660, taken by U.S. Bureau of Fish- 

 eries at St. Paul Island, Pribilof Islands, Jan. 13, 1918, from stomach 

 of duck, Somateria voniger. 



Remarks. — Because the specimen is from the stomach of a duck, 

 neither gills nor marsupial plates are present, but it is inferred from 

 the great development of the second antenna that the specimen is a 

 male. There is a close resemblance in some of the characters to 

 Metopelloides shoemaJceri Gurjanova (1938). Her specimen, ap- 

 parently a female, measured only 4 mm., but the present specimen, 

 presumably a male, measures 13 mm. Whether the difference 

 between these two species is due to the immaturity of Gurjanova's 

 specimen or to the difference in sex is impossible to determine. Fur- 

 ther and more abundant material probably will decide the question, 

 but for the present it seems best to regard them as distinct species, 



Proboloides pacifica (Holmes) 



Figure 6 



Metopa pacifica Holmes, 1908, p. 524, figs. 30-31. 

 Meiopella pacifica. — Gurjanova, 1951, p. 478, fig. 315. 



Male. — Head nearly as long as first 2 body segments combined; 

 lateral lobes bluntly triangular with apex rounding. Eye not present 

 in alcoholic type. Antenna 1 almost as long as antenna 2, peduncle 

 reaching slightly beyond fourth joint of antenna 2; first joint shorter 

 than second; third joint about ji as long as second; flagellum shorter 



