96 J. R. KiNAHAN on the Britannic Species of 



The general form of this species is elongate, the breadth being to the length 

 as 3 : 7 ; the carapace longer than broad, narrowed in front for two-thirds of its 

 lenfTth, then suddenly broader, and then slightly contracted behind. The ab- 

 domen is nearly as broad as the carapace. 



The carapace is rounded above, smooth, except the usual row of small teeth 

 posterior to frontal region. The rostrum is deeply depressed in the median 

 line, moderately long, terminating in a flattened tooth, and produced laterally 

 into four flattened teeth on each side, the posterior two of which are smaller 

 than the others, from which they are separated by an interspace, close together, 

 and situate at the inner canthus of the orbit. The upper surface of the rostrum 

 and the frontal region are covered with a few comparatively broad, rounded, 

 squamiform tubercles, which are margined with long cilias. The transverse 

 lines are shortly ciliated, and tootlied laterally. The rostrum surpasses the 

 eyes by half its own length. Vide Plate XL, fig. ra. 



The internal antennse bear cylindrical teeth on their peduncle, and, when 

 extended, surpass the eyes. 



The external (olfactory) antenna; are nearly as long as the first chelipeds, 

 their peduncle sparingly toothed. 



The first pair of chelipeds are as long as tlie conjoined carapace and abdo- 

 men ; the propodos is rounded above, narrow, its sides parallel, their outer- 

 most border margined with teeth, their innermost sparingly toothed, slightly 

 hairy. The dactylos and opposing process of the j)ropodos are linear, twisted, 

 and parallel ; their upper surface covered with rows of minute, irregular, den- 

 telated, squamiform tubercles, which are margined with a few long cilia;; the 

 under surface is polished, covered with ciliated squamiform tubercles. The 

 carpus bears a row of moderately strong teetli internally ; its surface and outer 

 margin are squamulate. The superior border and inner side of the meros is 

 toothed, its surface squamulate. The second and third chelipeds are toothed, 

 their upper borders squamulate above and below, their terminal articulations 

 furnished with strong stiff hairs below. The fifth pair is smooth and 

 slender. 



The external maxillipeds are short, the ischium much shorter than the me- 

 ros, the accessory appendage long. Plate XL, fig. 9a. 



The eyes are short, the eye-scale wide and haired. Plate XL fig. la. 



