226 SMITHSONIAN MISCELLANEOUS COLLECTIONS [voL. 48 
The first two, C. spinosus, were collected from Clinch R., Ten- 
nessee, by Dr. B. W. Evermann, Oct. 12, 1893, and bear the U. S. 
National Museum number of 20,835. They are both 91 mm. in 
length and may be distinguished as number 1 and.number 2. 
In number 1 the general appearance is that of a young or second 
form male. The third pair of legs is hooked and the second pair 
of abdominal appendages is exactly as in the normal male. The 
first abdominal appendage of the right side is like that of the normal 
C. spinosus of the second form but is possibly a little short. The 
corresponding appendage of the left side is shorter, the outer ramus 
is fairly well formed but the inner is much stunted and bent strongly 
downward. The basal segment of the fifth pair of legs is imper- 
forate although it bears a small papilla. There is a well developed 
annulus ventralis of the same structure but a little less prominent 
than in the normal female and the openings of the oviducts are 
perfectly formed and operculate and situated, as is usual, on the 
basal segments of the third pair of legs. 
A dissection of this specimen fails to show any trace of male 
organs internally but there is a well developed ovary filled with 
nearly mature eggs. 
In number 2 the general appearance is more like that of the 
female, the abdomen being broader and the chelipeds shorter than 
in number 1. Otherwise it corresponds perfectly with number 1 
except that the first pair of abdominal appendages are short and 
blunt and are not provided with the long, slender tips characteristic 
of the males of this species. A dissection of this specimen shows 
it to correspond exactly with number 1. 
The third specimen, C. propinquus, 53 mm. long, from near San- 
dusky, Ohio, is in general appearance a male of the second form but 
an examination of the ventral surface shows a striking lack of sym- 
metry, the right side being more strongly feminine, while the left 
side is masculine. Thus on the right side, on the third pair of legs, 
there is a normally formed and operculate opening of an oviduct; 
this is not even indicated on the opposite side. On the other hand, 
the left leg of the third pair bears the usual small hook characteristic 
of the male, while the right leg shows no trace of it. The annulus 
ventralis, rather lower than usual, has the outline and sculpture 
characteristic of the species but the small conical elevation just 
behind it, on the sternum of the last thoracic segment, bears a pencil 
of hairs exactly as in the male. The first abdominal appendage of 
the left side is entirely similar to the usual second form appendage 
of the species and the basal segment of the contiguous fifth leg is 
renee iee ae 
