170 
CRUSTACEA OF THE GALT. 
1. “A species of a new genus of the family Leu- 
cofiiadcB*, nearly related to the genus Arcania.^* 
In these specimens the shell or crust of the 
thorax alone remains. It is of a suborbicular form, 
rather inflated, obscurely trilobate, with twelve or 
thirteen aculeated tubercles ; the margin is dentated. 
2. “ A species of a genus of the family Corys- 
tid(p\, allied to a new Indian genus in the cabinet 
of Dr. Leach.” 
The shell is oblong, ovate, depressed ; the surface 
covered with minute granulse, the margin biden- 
tated near the front. No vestiges of the legs, an- 
tennse, or claws, remain. 
3. “A species of the genus Etyus, of the family 
Canceridcp.^^ 
Transversely obovate, obscurely trilobate ; the 
surface covered with irregular papillae. 
4. “ Idiese belong to a genus of the family Co- 
rystidcB, intimately related to Corystes'’ 
This species is longitudinally obovate, convex, 
with a tuberculated dorsal ridge, having a row of 
three tubercles on each side. The shell is truncat- 
ed posteriorly, and the margin laterally tridentated. 
The abdomen is composed of six or seven arcuate 
segments, and there are three or four legs on each 
side. 
* The recent Leucoxiadce have two or four small quadriarticulate 
antennae inserted between the eyes. The tail is naked; they have eight 
legs, all furnished with claws; and two chelate hand claws. — liees’s 
Ci/cloped. art. Cancer. 
t The Corystidce have four antennae ; the external pair approximate, 
setaceous, ciliated, and very long. The eyes remote and pedunculated. 
The shell is oval, and longer than wide; the tail folded under the body 
when the animal is in a state of rc|)osc. They have ten legs ; the anterior 
pair chelate, the others terminating in an acute elongated nail or claw. 
Vide hnmarck, Aninianr sans VerUhres, tome v. 2.3'k 
