222 AUSTRALIAN MAIM.COSTBACA. 



404. Allorchestes Australis. 



Allorchestes Australis, Dana, U. S. Explor. Exped., Crust., ii., 

 p. 892, pi. lx., fig. 7. 



Superior antennae a little shorter than the inferior ; flagellum 

 longer than base ; about fourteen-jointed, joints towards base 

 transverse. Inferior antennae less than half the body in length ; 

 flagellum rather longer than base, twelve to fourteen-jointed, 

 joints mostly oblong, set® nearly obsolete. Propodos of first 

 pair of gnathopoda quite small, but little oblong, much narrower 

 at base than at apex, nearly directly truncate at apex ; dactylos 

 not longer than breadth of propodos. Propodos of second pair 

 of gnathopoda large, subovate, palm compressed, posterior angle 

 with a few minute setae ; carpus produced into a narrow process 

 between the propodos and the fourth joint. Three posterior 

 pairs of pereipoda gradually increasing in length, third joint quite 

 broad, setae very short. [Z>.] 



Illawarra (Dana). 



405. Allorchestes rupicola. 



Allorchestes rupicola, Haswell, 1. c, Vol. iv., p. 250, pi. viii., 

 fig. 1. 



Eyes large, subreniform. Superior antennae as long as the 

 cephalon and two first segments of the pereion ; third segment 

 of the peduncle short ; flagellum longer than peduncle. Inferior 

 antennae as long as the cephalon and first three segments of the 

 pereion ; flagellum and peduncle subequal. Anterior gnathopoda 

 of moderate size, the carpus with a projecting ciliated process on 

 its inferior border ; the propodos ovoid ; palm oblique, convex, 

 defined by a blunt tooth. Posterior gnathopoda large ; the 

 propodos more than twice as long as that of the anterior pair, 

 ovate, its proximal border with a deep notch, its superior border 

 strongly convex, palm scarcely oblique, convex, armed with an 

 obscure tooth. Pereiopoda of the two anterio.r pairs subequal. 

 Three posterior pairs of pereiopoda increasing progressively in 

 length from before backwards. Posterior pleopoda short. Telson 

 nearly semicircular, divided. Length 4£ lines. 



Shallow rock-pools a little above high-water mark, Clark 

 Island, Port Jackson ; Botany Bay. 



