8 



ORTMANN 



ules largest on inner side ; a granule each at the distal end of 

 inner margin, on the anterior margin of inner side, and at distal 

 end of lower margin, more strongly developed and subspini- 

 form ( often only indistinctly so ) ; meropodite granulated, gran- 

 ules indistinct on outer and inner faces ; a subspiniform one 

 near distal end of upper margin, and several subspiniform ones 

 on lower side (often indistinct). 



Ischiopodite of third pair of pcreiopods with a strong hook. 



Fig. 2. Cambarus filosimanus, sp. n. First pleopod (right side) of male (I), 

 a, outer view; l>, inner view. Enlarged about four times. 



First pleopods (see fig. 2) rather short, straight ; anterior 

 margin with an indistinct, blunt shoulder near the tips ; outer 

 and inner part in close apposition to their tips ; tip of outer part 

 very blunt and rounded, slightly compressed in the antero- 

 posterior direction ; tip of inner part straight, thin and pointed, 

 distinctly longer than outer part ; at its base, on the anterior 

 side, in front of the shoulder, there is a short, procurved, horny 

 spine ; inner part flattened on inner face, slightly dilated, with 

 hairs radiating from an indistinct oblique rib. 



Male of second form: The horny spine of the copulatory 

 organs is replaced by a small, soft, blunt tubercle. 



Young males (of first or second form), less than 50 mm. total 

 length, differ in the areola, which is about as long as the ante- 

 rior section of the carapace ; chelipeds shorter and weaker, 

 their granulations indistinct; they have short, scanty hairs, and 

 the fingers are not pilose; carpopodite with well developed 

 spines; meropodite also with sharp spines; one near distal 

 end of upper margin, one at distal end of outer lower margin, 

 and one or two at distal end of inner lower margin ; besides, 



