34 A REVISION OF THE ASTACIDA. 
wide and the hands broad; @. versutus has the hand covered with small, 
close-set, squamous tubercles, the sides of the rostrum are subparallel, and 
the telson commonly tri- or quadrispinose on each side; in C. spiculifer the 
hands bear large tubercles much less closely set than in C. versutus, the 
rostrum tapers more between the base and the lateral spines, and the tel- 
son is bispinose on each side. Each of these five species has characteristic 
male appendages, figured by Hagen and on Plate VIII. of this Revision, 
11. Cambarus versutus. 
Canbarus versutus, Hacen, Il. Cat. Mus. Comp. Zodl., No. III. p. 51, Pl. I. figs. 55-58, Pl. IIT. fig. 150, 
1870. - 
Cambarus versutus, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 138, 1884. 
Known Localities. — Alabama: neighborhood of Mobile. Florida: Cape 
Barraneas [Pensacola Bay ?]. 
Cambarus versutus resembles C. spiculifer in the shortness of the carapace 
behind the cervical groove, the wide areola, and the two spines on each 
side of the carapace. In addition to the difference in the male appendages 
(see Hagen’s figures), the chelx are covered with small, closely-set squa- 
mous tubercles, while in C. spiculifer the chele have fewer and larger tuber- 
cles. In C. versutus the hand is suleated below, along the inner border, and 
the areola is a little wider. The telson is tri- or quadrispinose in C. versu- 
tus, bispinose in C. spiculifer. ‘The sides of the rostrum converge less between 
the base and the lateral spines in C. versutus. 
Measurements of a male, form I. — Length, 73.5 mm. Carapace, 35 mm. 
Abdomen, 38.5 mm. From tip of rostrum to cervical groove, 26 mm.; from 
cervical groove to posterior border of carapace, 8.5 mm. Length of rostrum, 
12 mm.; acumen, 5mm. Breadth of rostrum at base, 5.5 mm.; between 
lateral spines, 4 mm. Length of chelw, 33 mm.; breadth wf do., 11 mm. 
Width of areola, 4 mm. 
Three small dry specimens, two males and one female, from Cape Barran- 
cas, Fla., differ from the Alabama specimens in that the rostrum tapers a 
little more and is lightly carinated above in the middle third of the median 
line. Although none of the specimens are over 40 mm. in length, the males 
are of the first form, with well-developed hooks on the third and fourth pairs 
of legs. The male appendages agree with those of C. versatus: The telson 
is tri- or quadrispinose, and the hand is suleated below, along the inner 
margin, as in C. versutus. 
