142 AUSTRALIAN MALACOSTRACA. 



of chelipedes with a prominent conical projection on its outer 

 surface, and a smaller one internal to the first ; hand ornamented 

 with longitudinal rows of granules, two rounded tubercles above 

 the insertion of the dactylus. Dactylus granulated at base. 

 Carpus of ambulatory limbs, except the last, each with a small 

 conical tooth ; fourth pair shorter than the third, but very 

 stout, the carpus broad and thick with a deeply excavated 

 " palm," bounded by a stout conical tooth set at right angles to 

 the axis of the joint ; dactylus very powerful, strongly curved, 

 rather longer than the propodos. "Whole surface covered with 

 a short close green pubescence ; dactyli and granules tinged 

 with crimson. Length fi in. ; breadth f in. 



Port Denison, 5 f ath. ; Port Molle, 15 fath. (TV. A. H., H.M.S. 

 "Alert:') 



This species has the curious habit of protecting itself with 

 the valve of a Lamellibranch, which it holds tight over its back 

 by means of its unusually powerful and specially adapted fourth 

 pair of ambulatory legs. 



Family PABATYMOLIDM. 



Carapace in general form similar to the Maioiden. External 

 maxillipedes produced partly over the epistome. 



The position of this family is uncertain. It is perhaps better 

 placed among the Gorystoidea. 



Genus Parattmolus, Miers. 



Carapace deflexed in front, flat behind, with the sides nearly 

 straight. Front prominent, narrow. 



270. Paratymolus bituberculatus. 



Paratymolus bituberculatus, Haswell, Ann. and Mag. Nat. 

 Hist. (5), Vol. v., p. 303, pi. xvi., figs. 1 and 2 (1880). 



Carapace and limbs covered with a close pubescence. Rostral 

 spines short, blunt ; a short spine or tooth above the eye, and 

 two others on the lateral border behind it, the hindermost the 

 largest and placed at the angle of junction of the antero-lateral 

 and postero-lateral borders ; a small conical tooth situated about 

 the middle of the postero-lateral border ; gastric region with 



