CAMBARUS. 4 
Oo 
an opportunity to examine Cope’s type. It is a male, form II., with the 
first pair of abdominal appendages not articulated, a condition often found in 
the second form males of this species. After an examination of this speci- 
men, I can indorse the opinion of Hagen (Amer. Nat., Aug., 1872) and Pack- 
ard (Fifth Ann. Rep. Peabody Acad. Sci., for 1872), expressed before seeing 
the specimen, that the variation is not of specific value. All the specimens 
which I have seen from the Indiana caves, amounting to.six in number, 
belong to this form. But the same form also comes from the Mammoth and 
neighboring caves in Kentucky. In a gigantic female in the Museum of 
Comparative Zoilogy (No. 5417, collected in Mammoth Cave by F. W. 
Putnam), the peculiarities of Cope’s form are intensified. The point of the 
rostrum does not reach the distal end of the peduncle of the antennule, and 
hardly attains the proximal end of the distal segment of the peduncle of 
the antenna.* The lateral rostral spines are reduced to salient angles. The 
post-orbital ridges are destitute of spines, as in C. Barton. The antennal 
scales reach but to the proximal end of the terminal segment of the peduncle 
of the antenna. ‘The lateral spinules of the carapace are represented by 
granular tubercles. The spines of the meros of the cheliped are short and 
tooth-like ; those on the upper surface are blunt, those beneath are irregularly 
disposed, without the clear biserial order seen in the typical form, and also in 
Cope’s type of O. iermis. The hands are broad, flattened, and tuberculate. 
In this specimen, moreover, the anterior process of the epistoma is trun- 
cated in front. The dimensions are subjoined. Length of body, 95 mm. ; 
of carapace, 46 mm.; of rostrum (from level of post-orbital spines to tip), 
9mm.; of abdomen, 49 mm.; from tip of rostrum to cervical groove, 26 
mm.; from cervical groove to posterior margin of carapace, 20 mm, Length 
of cheliped, 84 mm.; of chela, 43 mm.; of antenna, 86 mm.; of antennal 
scale, 8 mm. ; 
The other blind Cumbarus from the United States (CL hanulatus from 
Nickajack Cave, Tenn.) resembles C. pellucidus superficially, but belongs to 
Group III., with hooks only on the third pair of legs in the male. The first 
pair of abdominal appendages are very different from those of C. pellucidus, 
being formed after the pattern of those organs in C. Bartoni’. The annulus 
ventralis of the female is also different. 
A small specimen of C. pellucidus was found in a jar containing C. Putaami 
from Green River, near the Mammoth Cave, collected by Mr. F. W. Putnam. 
* Inthe typical form of C pellucidus the rostrum equals or exceeds in length the peduncle of the antenna. 
