148 
also are strongly spined and lie posterior to the subocular at 
the lower level. 
The pleon is very slightly geniculate at the third segment. 
The first five segments do not di£er much in dorsal length 
except the first, which is shortest, and their sides are not 
very deeply produced, that of the fifth is produced pos- 
teriorly well along the sixth—in some specimens nearly its 
whole length—and there is a small spine on its posterior de- 
scending border. The sixth segment is much longer than 
the dorsal portion of the fifth, its posterior margin bears 4 
lobed spine projecting over the base of the telson on each 
side, and the posterior angles also are very acute. 
The telson 1s slightly longer than the sixth segment, nar- 
row, arched, and tapering with the usual four quadrately 
placed spines, which are placed rather low down; it termi- 
nates with six strong spines, two of which are small and 
median, one above the other, the next two outer and longer, 
the external two short. 
The rostrum is rather more than one and a half times as 
long as the carapace, straight or slightly curved upwards, 
gradually tapering, with its base occupying the whole of the 
interocular space, having a dorsal and two lateral ridges; 
deeply carinate below, especially at the proximal end, with 
numerous spiniform teeth which decrease in frequency for- 
wards, but do not reach near to the apex. Between the 
teeth there are soft hairs. (Three specimens had respectively 
sixteen, eighteen, and over thirty teeth.) 
The ophthalmopods are rather short, they are pyriform, 
and capable of being partially covered by the lateral ridges 
of the rostrum. 
The antennules are short and partially obscured by the 
lateral ridges of the rostrum. The peduncle does not reach 
half the length of the antennal scale, the first joint is exca- 
vate above to receive the ophthalmopod, the stylocerite spine 
reaches a little beyond its end, the second joint is longer 
than the third, and together they are about as long as the 
first joint. The upper flagellum is thickish and shorter than 
the peduncle, the lower one slender and longer, but does not 
reach to the ena of the antennal scale. The antennal scales 
are very long, narrow, rigid, and taper to acute terminal 
teeth. The second peduncular joint of the antenna has 4 
strong external spine at the base of the scale, and the re- 
maining joints are only about one-fifth the length of the 
scale. The flagellum is slender and long. 
The third maxillipeds are short, only reachiug a little 
beyond the anterior angles of the carapace. The first of 
the three joints of the endopod is long and a little curved, 
or twisted proximally, the second very short, the third is 
