14 A. O. WALKER. 
plates but little deeper than the segments. Hind margin of the epimere of the third 
pleon segment forming a rounded right angle with the straight lower margin. First 
urus segment as long as the remaining two, carinate ; second shorter than third. 
Head: The ocular lobe reaching the end of the first joint of the lower antenne, 
rounded at its apex. yes large, wide-oval, dark red in spirit. 
Upper antenne: First jomt about three times as long as the next two, naked ; 
third shorter than the second. Flagellum in the female 11-jointed, the first as long as 
the next two, with a few long sete below. Appendage 4-jointed, the first twice as 
long as the second, which is subequal to the third, the fourth minute, the whole very 
sparsely setose. 
Lower antenne slightly longer than the upper; flagellum 12-jointed, subequal to 
the peduncle. 
Mouth organs as in O. nana (Kr.). The mandibular palp strong, with the second 
joint twice as long as the third. 
First gnathopods: Side plates widening downwards, rounded in front, straight 
behind. First joint almost as long as the rest united ; front margin of the wrist rather 
shorter than that of the hand; hand rather narrower than the wrist, slightly curved, 
the hind margin produced distally so as to form an imperfect chela with the dactylus ; 
the oblique palm is finely pectinate and defined by two spies; the hind margins of 
the third, fourth, and fifth joints are densely fringed with short sete. 
Second gnathopods rather stout ; side plates oblong, widening below. First joint 
about twice as long as the second, which is longer than the third; this has the hind 
margin densely pilose ; wrist tumid, much longer and wider than the hand, the hind 
margin convex, scabrous ; front margin straight, densely setose ; hand densely setose, 
with a few strong curved and serrate spines over the insertion of the dactylus. 
Second pereopods : Side plates moderately produced and angulate behind. 
Third, fourth, and jifth pereeopods of similar structure, Increasing in size suc- 
cessively ; the side plates of the third pair are wider than deep, and much larger than 
the first joints. The first joints in the three pairs are wide and obscurely crenate 
behind. 
First uropods extending a little beyond the second, and these beyond the third ; 
inner ramus of the third not reaching the last joint of the outer. 
Telson barely reaching the end of the peduncle of the third uropods, deeply 
notched. 
Recognisable by the peculiar form of the first gnathopods. 
ORCHOMENOPSIS ROSSI. 
Orchomenopsis rossi, A. O. Walker. 
This species was taken in enormous quantity throughout the year, and is doubtless 
the one to which Mr. Hodgson refers in his “ Preliminary Report,” p. 398, as being 
‘commonly taken 10,000 to 30,000 at a haul.” It is noteworthy that it has not been 
