366 Messrs. J. Wood-Mason and A. Alcock on 



inferior angle of the first abdominal plcuron is deoidodly 

 produced. 



'^I'lie 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 oidy y teeth. The antcro-inferior 

 angle of the first abdomiiutl pleuron is much as in the 

 preceding specimen. 



The left antennule has been cut clean off at tlie articulation 

 between the basal and the second joints of the peduncle. 



The latter of these specimens agrees exactly with Milue- 

 Edwards's figure of H. qracilirostn's in Rec. Fig. (Jrust,, 

 this being so, and all our specimens belonging without doubt 

 to one species, H. Smithii 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- 

 2)hyrai; 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° H5' N., long. 92^ 24' E., in 272 

 fathoms. It measures about 59 millim. in length. The 

 rostium, whicli is weak and somewhat deformed, and more- 

 over has lost its tip, is only -^-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 ])ro]ongations of their bases, espe- 

 cially the anterior pair, which are attached quite close to the 

 edges of the pleura. The two anterior abdominal sterna too 

 appear to be more strongly arched upwards, whereby the 

 height and hence the cajnicity of the pouch is still further 

 increased. 



The eggs 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. 



