8 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL, XXXIV. 
Subfamily MYSIN_A Norman.4 
Diagnosis.—Outer uropods one-jointed, their outer margin setose. 
Gnathopods (2. Cormopods) conforming in general character of 
endopodite to the maxilipeds (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; MNeomysis 
Czerniavsky; J/acropsis Sars; Mysis Latreille; Schistomysis Nor- 
man; J/acromysis 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, spie-lke 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 subtriangular, 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 Mysine, 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—Mysis vulgaris J. V. Thompson. 
NEOMYSIS KADIAKENSIS Ortmann, new species. 
Station No. 4272—1 male, 2 females—Afognak Bay, Afognak 
Island, Kadiak Group, 17 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 V. vulgaris, as figured by Sars.4) Hyes, anten- 
nule, and antenne similar to those of V. 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. 
6 Norman, Idem, p. 261. 
¢'This sentence is to be dropped on account of Neomysis americana (Smith). 
~ Monogr. Mysid., III, 1879, pl. xxxiv, fig. 1. 
