1894.] Zoology. 1043 
length almost three times its greatest width), slightly curved outward 
and ending in a sharp spine, equals the rostrum. 
Basal segment of antennal scale with a prominent spines on anterior 
lateral borders. Chelipeds slender, not tuberculated, slightly hairy ; 
fingers shorter than hand, opposed margins of the fingers straight, hand 
smooth; carpus smooth; a spine on inner and outer distal borders. 
Meros smooth with one spine on upper and one on outer side, and two 
below, all spines on distal 1-3. Third pair of legs hooked, fifth pair 
with a small roundish tubercle on basal joint. 
Anterior abdominal appendages strong and of moderate length, tips 
reaching between third pairs of legs, bifid at apex, apex of inner part 
posterior and acute, its tip turned slightly outward, outer bluntish. 
Color of this species somewhat mottled with bluish on antennal 
scale and rostrum, forming cross bars. 
This is apparently a small species. The largest specimens taken were 
females, length (from tip of acumen to posterior margin of telson) of 
largest specimens, 23 inches. The size of average males, 21 inches. 
This species is easily recognized by its long, slender acumen, small hand, 
slender antennal scale and its small size. Found in St. Francis River 
at Greenway and Big Bay. It is by no means abundant. This and 
young of one other species, C. palmeri, are all I found in the St. Fran- 
cis River. 
Named in honor of Dr. Walter Facon, to whom we owe more than 
to anyone else our knowledge of North American crayfishes. 
EXPLANATION OF FIGURES. 
Dorsal view of specimen, x, 1.31. 
Abdominal appendage, inner view, x, 4.35. 
Abdominal appendage, jess view, x, 4.35. 
4. Epistoma, x, 4. 
ax 
The drawings were made by Miss Allie Simonds, Arkansas Univer- 
sity, Class 1895. 
S. E. MEEK, 
Arkansas University, 
Oct. 22, 1894, Fayetteville, Ark. 
A New Bassalian Type of Crabs.—In a recent number of the 
Journal of the Asiatic Society of Bengal (v. 63, part 2, No. 3), a most 
remarkable crab has been described and illustrated by Messrs. A. 
Alcock and A. R. Anderson. It has been designated (p. 141) as“ Arche- 
69 
