366 Messrs. J. Wood-Mason and A. Alcock on 
inferior angle of the first abdominal pleuron is decidedly 
produced. 
The right eye-peduncle has been neatly and cleanly excised 
without injury to any of the surrounding parts. 
Another male from Station 115, 188-220 fathoms, is larger 
still, measuring about 77 millim. in length. The rostrum is 
still shorter and bears only 7 teeth. The antero-inferior 
angle of the first abdominal pleuron is much as in the 
preceding specimen. 
The left antennule has been cut clean off at the articulation 
between the basal and the second joints of the peduncle. 
The latter of these specimens agrees exactly with Milne- 
Edwards’s figure of H. gracilirostris in Rec. Fig. Crust., 
this being so, and all our specimens belonging without doubt 
to one species, /7. Smitha’ is no longer maintainable as a 
distinct species and must be suppressed. 
Our series proves that the rostrum in the male decreases in 
length from adolescence to maturity, as in some Acanthe- 
phyre ; but whether it is shorter than the carapace in very 
early life, subsequently growing to the length it has in the 
adolescent animal, there is at present no evidence to show. 
An ovigerous female was taken in a former season in the 
Bay of Bengal, in lat. 19° 35’ N., long. 92° 24” E., in 272 
fathoms. It measures about 59 millim. in length. The 
rostrum, which is weak and somewhat deformed, and more- 
1 
over has lost its tip, is only “7-toothed. The pleura of the 
first and the second abdominal terga are soft and membra- 
nous and larger than in the male, more especially the latter of 
the two; and they form the lateral walls of a capacious incu- 
batory pouch for the eggs. The appendages are smaller and 
are attached much further below the level of their sterna than 
in the male, being carried downwards towards the edges of 
the pleura by pillar-like prolongations of their bases, espe- 
cially the anterior pair, which are attached quite close to the 
edges of the pleura. ‘Lhe two anterior abdominal sterna too 
appear to be more strongly arched upwards, whereby the 
height and hence the capacity of the pouch is still further 
increased. 
The eges are few in number, only eighteen having been 
found beneath the abdomen of our specimen, and large, 
measuring 2°4 and 1°6 millim. in major and minor diameters 
respectively. 
