432 Zoological Society. 



teeth on the outside, above hollowed and slightly grooved down the 

 middle, edges over the eyes considerably thickened. Hands, outside 

 with a double row of serratures extendmg to near the end of the fixed 

 claw ; inside edge serrated with four teeth and one tooth at the end ; 

 moveable claw with six or seven teeth placed irregularly but chiefly 

 on the ridge ; claws elongated, inner edge with a few bluntish teeth, 

 the end somewhat hooked. Wrist with each of the lateral edges 

 furnished with two strong teeth or spines. Carapace smooth along 

 the back ; the sides of the front portion with a few spines, which on 

 the lower part are almost reduced to tubercles ; hinder part of the 

 carapace separated from the front portion by a very deep groove, each 

 of the sides in front with two spines ; the sides of this portion are 

 thickly covered with tubercles, which increase in size as they approach 

 the back. Abdomen smooth on the dorsal line, the sicles spined ; 

 the first segment with a large prominent spine on each side of the 

 first segment j second segment with twelve or thirteen spines, four or 

 five on each edge of the dilated part, the other two larger and situated 

 on the sides ; the spines are more or less conical and sharp, the one 

 on each side nearest the back blunt ; the third, fourth and fifth seg- 

 ments with eight spines each, placed transversely, the two inner 

 bluntest ; the sixth segment with ten or eleven small spines or 

 tubercles ; the seventh or terminal segment with seventeen or eighteen 

 small sharp spines arranged in a crescent-like figure, the convexity 

 being outwards. The two posterior pairs of legs with the penultimate 

 joint on the outside furnished with two rows of serratures. 



Carapace and legs in the dead specimen of a dirty yellowish brown 

 hue, tinged on the carapace with red. In Dr. Shaw's figure this 

 crayfish is coloured of a bright red, the sides of the claws, carapace 

 and abdomen, are tinged with blue ; the specimens, however, were 

 preserved in spirits. Dr. Shaw does not mention from what part of 

 New Holland the specimens described by him were received ; I cannot 

 find any trace of them, neither does any author that I am aware of 

 refer to his figure or description. 



The species comes closest to the Potamobius (Asfacus) Franklinii, 

 described with three other Australian species of the same genus by 

 Mr. Gray, in the Appendix to Eyre's Discoveries in Central Austra- 

 lia, vol. i. p. 409, t. 3. f. 1. 



The specimen in the British Museum was found by Mr. Strange 

 in freshwater creeks, Brisbane Water. Mr. Leicester informs me 

 that the species is not uncommon also in the Richmond River. 



GONODACTYLUS CTJLTRIfER, U. Sp. 



In a Chinese collection, part of which was acquired by the British 

 INIuseum, there occurs a Gonodactylus quite distinct from any of the 

 species of this genus which have been described. This species enters 

 into the second section of Prof. Milne-Edwards, in which the rostral 

 plate is rounded, or scarcely pointed, in front. From the elevated 

 compressed process on the seventh abdominal ring, this species may 

 be called G. cultrifer. 



The sides of the carapace are very thin and membranaceous. The 



