AUSTEAIilAN MAI/ACOSTRACA. 177 



ending in a slight spine; the hands elongated, compressed, 

 smooth, with a thickened, toothed inner margin, which is ciliated 

 above ; wrist with two conical spines on the inner side. {.Gray,] 



Western Australia. 



329. Astacopsis quadricarinatus. 



Champs quadricarinatus, Von Martens, 1. c, p. 617. 



No middle keel on the carapace, but two lateral keels on each 

 side, the inner continued into the border of the rostrum. Kostrum 

 as long as the base of the antennae, with two teeth on either side. 

 Hand slender, more than thrice as long as broad. 



Cape York. 



330. Astacopsis bicarinatus. A.M. 



Astacus bicarinatus, Gray, Eyre's Central Australia, Vol. i., 

 p. 410 (Appendix), pi. iii., fig. 2. 



Charaps bicarinatus, Von Martens, 1. c, p. 617. 



Carapace smooth, rather flattened, with a keel on each side 

 above in front ; the beak longly produced, flattened, three-toothed 

 at the top. Hands rather compressed, smooth, thinner and 

 slightly toothed on the inner edge ; wrist triangular, angularly 

 produced in front. Central caudal lobes with two slightly 

 diverging keels continued, and like the others thin and flexible at 

 the end, the inner lateral lobes with two keels, each ending with 

 a spine. [Grray.] 



Port Essington ; Cape Vork ; Manning Eiver, etc. Widely 

 distributed throughout Australia, especially in the north. 



331. Astacopsis Preissii. 



Charaps Preissii, Erichson, Archiv. fur Nat., 1856, E. von 

 Martens, 1. c, p. 617. 



Without keel (?) on the cephalothorax. Hand strong, more 

 thickly and coarsely punctate on the outer side. [M. von Jf.] 



South-west Australia (Preiss). 



J, 



