100 BULLETIN OF THE 
This specimen, although 27 mm. in length, is not yet adult, as shown by the 
rudimentary condition of the seventh pair of legs, and differs from the pre- 
ceding especially in having the eyes more finely granulated. The material is 
too incomplete to attempt a full description. 
Syscenus infelix Harcer. 
Plate III. Figs. 5, 5a. Plate IV. Figs.3-3h. 
Syscenus infelir HarcER, Rep. U. 8. Fish Com., Pt. IV. for 1878, p. 887. 1880. 
Three specimens of this species were obtained at two localities; viz. a single 
female at Station 303, Lat. 41° 34’ 30” N., Long. 65° 54’ 30” W., from 306 
fathoms, and two males at Station 309, Lat. 40° 11’ 40” N., Long. 68° 22’ W., 
from 304 fathoms. Besides these specimens a considerable number have also 
been obtained by the U.S. Fish Commission, from various localities along the 
coast as far south as Delaware Bay, and from a depth as great as 372 fathoms, 
so that the species, originally described from a single specimen, has now be- 
come comparatively common in the collection, and I am enabled to make 
some corrections in the description already given, as well as to add further 
details and present figures of the species. 
Many of the specimens since obtained are larger than the type, and such 
examples often have the body quite distinctly corrugated and rather coarsely 
pitted, especially upon the head and the anterior part of the thorax or pereion. 
In some of the larger males the ocular regions on each side of the head are 
swollen and distinctly pitted and corrugated. On the lateral margin of the 
head is a notch, into which may be received a short process on the anterior 
angle of the first segment, thus producing a very firm articulation when the 
head is drawn closely against the first segment. The flagellum of the anten- 
nula is usually composed of seven segments instead of six, but the number 
may be different on opposite sides of the same specimen. A bottom view of 
the head, enlarged eight diameters, is given on Plate IV. Fig. 3, showing the 
antennary organs, the right antenna being removed to show the antennula 
of that side. 
The maxillipeds (Pl. IV. Fig. 3c) are robust, thickened along the inner or 
median side where they meet; the first segment of the palpus is large, nearly 
square, and armed at its inner distal angle with a single hook; its distal margin 
is shorter than the proximal, and is angulated at the articulation with the second 
short transverse segment. This segment is armed distally with three hooks, 
of which the anterior appears to be articulated and should perhaps be regarded 
as a third segment of the palpus. The outer or second maxille are thin, deli- 
cate, and obscurely lobed at the tip, where they are armed with a single small 
hook. The inner or first maxilla (Pl. IV. Figs. 3b, 3b’) are armed with 
spines, of which the inner are shorter and straight, the outer are larger and 
