24 A REVISION OF THE ASTACIDA. 
The four type specimens, collected by Dr. H. Bryant, are 1 ¢ form I, 
2 ¢ form II., 1 ¢. The measurements given by Hagen are those of the 
largest specimen, ¢ form II. This is the largest specimen I have seen. 
©. fallax is very near C. Blandingii, which it seems to replace in the State 
of Florida. It is easily distinguished from the latter species by the male 
appendages, which are curved backwards at the end, and armed with only 
minute teeth at the tip. The distal margin of the proximal segment of the 
telson is armed on each side with three or four spines. In a few specimens 
from Hawkinsville, St. John’s River, Fla., the acumen of the rostrum is 
lengthened, the lateral spines of the rostrum are stronger, and the portion 
of the carapace behind the cervical suture is shortened. The specimens 
thus approach C. Leconte. The shortening of the posterior part of the 
carapace is not so great as in C. Leconte:, the areola is narrower, and the 
male appendages do not differ from those of the typical C. fallax. In the 
ordinary form of C. fallax the distance from the tip of the rostrum to the cer- 
vical groove is twice the distance from the cervical groove to the hind border 
of the carapace. In the abnormal specimens just noticed the anterior dis- 
tance is two and one third times. that of the posterior ; in C. Leconte: it is 
two and one half times. In many specimens, contrary to Hagen’s descrip- 
tion, the antennze are much longer than the body, and in well-developed 
males of the first form the chelze are inflated and cylindrical. Specimens 
of this species, now in the Museum of the Peabody Academy of Science, 
Salem, were collected by C. J. Maynard, in Blue Spring, St. John’s River, 
a mineral spring impregnated with sulphur and magnesia, — temperature 
70° Fahr. They were clinging to the under side of leaves. 
3. Cambarus Hayi. 
Plate I. fig. 4, Plate VII. figs. 3, 3’, 3a, 3a’. 
Cambarus Hayi, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 108, 1884. 
Male, form I. Rostrum broad, triangular, excavated, sparsely pubescent 
above; acumen short, lateral spines moderate. Carapace punctate above, 
granulated on the sides, the granules ciliate. Lateral spines slightly devel- 
oped in fully-grown individuals, more prominent in the young. Areola 
narrow. Abdomen broad, shorter than the cephalo-thorax. Pleural angles 
rounded, “Proximal segment of telson with two spines on each side of the 
distal border. Hind margin of telson slightly concave. Anterior ‘process 
