UPPER, OR FLINTY CHALK. 223 



Tab. xxxi. fig. 2. Cast of the thorax; the head broken off. 



fig. 3. The thorax flattened by compression. 



—fig- 4. Eepresents the most perfect specimen in my col- 

 lection. 



a. The head. 



h. The thorax. 



c. One of the long setaceous antennae. 



d. The squamous peduncle of the same. 



e. One of the anterior legs, with its didactylous 



termination, 

 /. The hand-claws, and pincers. 

 Tab. xxxiv. fig. 9. Part of a claw flattened by compression. 

 Localities. Upper chalk, near Lewes, and Houghton *. 



95. Astacus . Tab. xxx. fig. S. 



This specimen is evidently the chelate hand-claw of a species of 

 Astacus, distinct from the preceding. The surface both of the claws and 

 pincers is spinous, the latter are slightly curved, and armed with a row of 

 obtuse tubercles. 



Locality. Upper chalk, near Lewes. 



96. Cancer. Tab. xxix. fig. 3. 



This figure represents the chelate hand-claw of a species of Cancer, 

 having a minutely granulated surface. The pincers are curved, and 

 finely serrated on the inner edge. 



Locality. Upper chalk, near Lewes. 



97. Cancer. Tab. xxix. fig. 2. 



The cast of the thorax, of a species of Cancer, is represented in the 

 figure referred to. It is of an obcordate form, much depressed, the 

 margin impressed with four or five indentations, and the front cleft in the 

 middle. 



* A specimen, containing the chelate hand-claws, and the extremities of two legs, has lately 

 been discovered in the chalk near Houghton, in Western Sussex, by Mr. Frederic Sargent, of 

 Wool Lavington : to the kindness of John Drewett, Esq. of Peppering, I am indebted for an 

 excellent lithographic drawing of this interesting fossil. 



