104 DE. J. a. DE MAK ON THE PODOPHTHALMOTTS 



been covered with a very short dense down, but it seems to have 

 been rubbed off the prominent parts of the upper surface, as it 

 is now found only in the grooves and depressions. 



The shape of the external maxillipeds may be easily recognized 

 by the figure. The merus-joint is much longer than broad and 

 riot simply rounded at the distal end. It appears rather quadri- 

 lateral, the arcuated outer and the concave inner margin having 

 the same length and being much longer than tbe two other 

 margins situated at the distal end ; these margins make a nearly 

 right angle with each, other, and the anterior one, on which the 

 palpus is inserted, is a little concave, the other somewhat ar- 

 cuated. The palpus is rather large ; its penultimate joint, which 

 is nearly once and a half as long as the antepenultimate, has 

 a characteristic form, being somewhat dilated towards the distal 

 end, where it is obliquely truncated. The dactylopodite is rather 

 short, and does not extend beyond the distal end of the penul- 

 timate joint. 



The legs are quite similar to those of P. pisum, but they are 

 a little shorter in proportion to the cephalothorax, and the 

 joints are somewhat less slender. The chelipedes perfectly 

 resemble those of P. pisum. The ambulatory legs have all 

 nearly the same length ; those of the third pair are not longer 

 than the legs of the first and the second pair, and those of the 

 fourth pair are not shorter than the legs of the third pair. The 

 dactylopodites of the ambulatory legs have all the same length, 

 being somewhat shorter than the propodites ; they are a little 

 arcuated, and each terminates in a very acute point. 



The chelipedes and the other legs are covered with a short 

 dense down, with interspersed longer hairs. 



Dimensions : — 



Breadth of the cephalbthorax 16 millim. 



Length of the cephalothorax 15 „ 



Length of the ambulatory legs 14 „ 



This species, with which I have much pleasure in associating 

 the name of the eminent .carcinologists of the Museum du Jardin 

 des Plantes, is evidently closely allied to Pinnotheres Mouxi, 

 M.-Edw., and to P. villosus, Gruer., from the Indian seas ; but it 

 differs from these in the shape of its maxillipeds, and from 

 P. Bouoci moreover by the short down with which it is covered. 



