REPORT ON THE CRUSTACEA MACRURA. 189 



bundle of branchial filaments, the rudimentary podobranchial plume ; the basis is short, 

 and carries an unbranched ecphysis, rudimentary in its character, and fringed with 

 short hairs ; the ischium is short and triangulate ; the meros is very long, with the 

 margins subparallel, approaching each other a little towards the distal extremity ; the 

 carpos is short and flat, narrow at the base, expanding distally, in the central de- 

 pression of the extremity it articulates with the propodos, which expands in a similar 

 manner, and similarly supports the dactylos, which is broad and spatuliform, and 

 terminates in a blunt point, and like the preceding, is fringed with a brush of hairs. 



The second pah' of guathopoda (ij is rather more pediform than the first, and consists 

 of seven joints, the dactylos being styliform. The coxa supports a mastigobranchia that 

 is broader, but scarcely longer than that of the first gnathopod, but instead of a small 

 fasciculus of branchial filaments, the bundle is developed into a well-formed but not large 

 branchial plume. 



The first pair of pereiopoda is subecpial in size and uniform in shape, that on the 

 right side being very slightly larger, and the small tubercles that adorn the inner and 

 lower surfaces are a little more conspicuous. The coxa is short, and articulates freely 

 with the somite ; the basis is short, and articulates freely with the coxa, but is fused with 

 the ischium, which is moderately long and on the inferior side produced obliquely, 

 beyond that of the upper surface ; the meros is long, articulating laterally with the 

 ischium, rounded on the outer, but flattened on the inner side, and widens towards the 

 distal extremity, where it is armed with three large teeth, one on the lower, one on the 

 inner and upper, and one on the outer angle, which last assists in forming the socket of 

 the joint for the articulation of the carpos ; the carpos is about half the length of the 

 meros, it is nearly cylindrical, and armed on the outer surface near the centre with a 

 sharp, strong tooth, one on the upper, and another on the inner distal angle ; the 

 propodos is long, compressed, with the outer margin smooth and the inner minutely 

 tuberculated, near the centre of which is a short, sharp tooth, more pronounced on the 

 left than on the right appendage from the smaller and less conspicuous character of the 

 tubercular granulations. 



The dactylos and pollex are very nearly as long as the palm in the male and a little 

 longer in the female ; they are smooth and continuous in a straight line with the joint on 

 the outer surface, and fringed on the inner with two rows of closely-packed, short, plumose 

 bans ; near the centre of the lower row stands a solitary, obtuse, strong tooth ; another 

 small one is situated at the anterior extremity of the same row of hairs, beyond which 

 the tip suddenly curves to meet a similar opposing bend at the end of the dactylos, 

 which is of the same length, and lies parallel to it, and is armed on the inner surface with 

 a row of uneven, small, cusp-like teeth, forming a ridge that bites between the two rows 

 of hairs on the pollex. 



The second pair of pereiopoda does not reach beyond the carpos of the first. It is 



