6 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiv. 



The chief character of this genus is furnished by the development 

 of the fourth pair of pleopods of the male (Plate I, fig. 11). 

 Here it is the inner ramus (i. e., the one that carries a lobe-like proc- 

 ess at the base) which is elongated beyond the outer one, while in 

 all other genera with a tendency to increase the length of a branch of 

 this appendage, it is always the outer branch that surpasses the inner. 

 In shape, this elongated inner branch resembles to a degree that of the 

 outer branch of Mysidopsis and Mysideis, being somewhat an exag- 

 geration of the structure found in these two genera. 



In the form of the antennal scale (Plate I, fig. 2) Holmesiella 

 differs from all related genera (Leptomysis, Mysidopsis, Afysideis), 

 and rather recalls Callomysis, or the genera of the Erythrops group. 

 The shape of the telson does not differ much from the types known 

 among the typical group of the Leptomysina?. In all other respects, 

 it possesses nothing that. varies considerably from the characters as- 

 signed to the subfamily Leptomysinse. 



Type of the genus. — Holmesiella anómala. 



HOLMESIELLA ANÓMALA Ortmann, new species. 



Plate I, figs. 1-13. 



Station No. 1^192. — 12 young (male and female) (cotypes). — Gulf 

 of Georgia, off Nanaimo, Vancouver Island, 89-97 fathoms. 



Station No. 1$51. — 5 female adults (cotypes). — Stephens Passage, 

 south of Juneau, 198 fathoms. 



Station No. 1$67.—1 male adult, type Cat. No. 31494, U.S.N.M.— 

 Vicinity of Funter Bay, Lynn Canal (north of Juneau), 350 fathoms 

 (estimated). 



Station No. 1$61±. — 2 female adults, cotypes Cat. No. 31492, 

 U.S.N.M. — Off Freshwater Bay, Chatham Strait, south of Juneau, 

 293-282 fathoms. 



Description of adult male. — Total length of largest specimen (type, 

 from Station No. 4257), 37 mm. Body slender, but strong. Cara- 

 pace with the frontal part projecting, not pointed, but broadly 

 rounded. Eyes comparatively large, cornea globular, dark brown. 

 Antennulm (Plate I, fig. 1). — Projecting beyond the eyes with the 

 terminal joint of the peduncle; first joint subcylindrical, second joint 

 very short, terminal joint swollen, thicker than the two preceding 

 ones, about as long as thick, with the usual conical process at the 

 distal end on the under side. 



Antennae (Plate I, fig. 2). — With the peduncle shorter than that 

 of the antennulse. Antennal scale large, projecting far beyond the 

 peduncle of the antennulse, lanceolate, margins almost parallel in the 

 middle part ; outer margin almost straight, without setas, terminating 

 in a strong spine a short distance from the tip. Tip and inner margin 

 setose. 



