8 ORTMANN 
ules largest on inner side; a granule each at the distal end of 
inner margin, onthe 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). 
Ischtopodite of third pair of peretopods with a strong hook. 
Fic. 2. Cambarus pilosimanus, sp.n. First pleopod (right side) of male (I). 
a, outer view; 4, 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, 
