8 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiv. 



Subfamily UVIYSINJiÜ Norman.« 



Diagnosis. — Outer uropods one- jointed, their outer margin setose. 

 Gnathopods (2. Cormopods) conforming in general character of 

 endopodite to the maxillipeds (1. Cormopods). First true legs (3. 

 Cormopods) similar to the following in general character. Male 

 with first, second, and fifth (exception, Hemimysis) pleopods as in 

 female; the third consists of a basal joint and two branches, rarely it 

 is also simple; the fourth consists of a basal joint and two branches, 

 the inner minute, the outer styliform and generally of great length. 



Genera. — Hemimysis Sars ; Diamysis ■ Czerniavsky ; Neomysis 

 Czerniavsky; Macropsis Sars; My sis Latreille; Schist omy sis Nor- 

 man; Macromysis A. White. 



Genus NEOMYSIS Czerniavsky 1882. & 



Diagnosis (according to Norman). — Antennal scale subulate, very 

 long and narrow, six to ten times as long as broad (running out into 

 an acute, spine-like termination) , ciliated on both margins. Labrum 

 acutely pointed in front. Legs with multiarticulate tarsus (propo- 

 dite), posterior pairs more strongly built than the anterior, and with 

 more articulations in tarsus. Telson sub triangular, elongated, apex 

 entire, pointed, margins spined (the spines subequal, no smaller 

 spines alternating with larger ). In the male the third as well as 

 the first, second, and fifth pleopods are simple, and resemble the same 

 organs in female; fourth pleopod with a short peduncle, not much 

 longer than broad, inner branch as usual in Mysinse, outer branch 

 consisting of only two articulations, the first very long, the second 

 rather short; from its end spring two subequal, spiniform, ciliated 

 filaments of no great length. 



Type. — My sis vulgaris J. V. Thompson. 



NEOMYSIS KADIAKENSIS Ortmann, new species. 



Station No. 1$72. — 1 male, 2 females. — Afognak Bay, Afognak 

 Island, Kadiak Group, IT to 12 fathoms. 



Body slender; total length of largest individual (female), 21 mm. 



Frontal margin slightly produced, bluntly triangular (correspond- 

 ing closely to that of N. vulgaris, as figured by Sars. ) Eyes, anten- 

 nulce, and antennw similar to those of N. vulgaris, but antennal scale 

 more slender, 13-14 times as long as wide (9-10 times as long as 



«Norman, Ann. Nat. Hist. (6), X, 1892, p. 147. 



& Norman, Idem, p. 261. 



c This sentence is to be dropped on account of Neomysis americana (Smith). 



d Monogr. Mysid., Ill, 1879, pi. xxxiv, fig. 1. 



