182 AUSTRALIAN MALACOSTRACA. 



purple grey bauds, the peduncles of the eyes with two bands ; 

 the external maxillipedes marked ou the surface with four riugs 

 of the same colour. [Stiips.~] 



Port Jackson ; Port Stephens. 



Genus Buynchocyclus, IStimpson. 

 340. Rhynchocyclus compressus. 



Rhynchocyclus compressus, Stimpson, Proc. Acad. Nat. Sci., 

 Philad., Vol. xii., p. 28. 



Body compressed. Carapace with a strong dorsal crest armed 

 with two obtuse teeth, the anterior the larger, and armed 

 anteriorly with a minute spine. Rostrum rather deeper than 

 long, extending beyond the appendages of the antenna?, obliquely 

 truncate, the upper margin concave, smooth. Infra-ocular spine 

 minute. Margin of the carapace with three denticles at the 

 insertion of the antenna?. External maxillipedes obtuse at the 

 extremity and armed with seven strong horny spines. All the 

 legs very short. Carpus of the first pair of legs obtuse. Colour 

 greyish-purple, the back bluish. Length f in. \_Stimps.~] 



Port Jackson. 



Family II ATYIBM. 



First and second pair of legs both small, weak, fingers ciliate. 

 Hand articulated with the wrist by the middle of its lower 

 margin. Wrist of the first and sometimes of the second pairs of 

 legs lunate- excavate anteriorly, and of the second never annu- 

 lated. Mandibles broad at the tip, slightly bilobed, not 

 palpigerous. 



G-enus Caridina, Milne-Edwards. 



Carapace with a well-developed rostrum. Internal antenna? 

 w r ith two multiarticulate flagella, of which one is thickened at 

 the base. External maxillipedes long, slender, and pediform. 

 Thoracic legs without an accessory palpus. Anterior legs short, 

 with the wrist nearly triangular, broadest and lunate-excavate in 

 front. Hand articulated with the wrist at its lower angle, fingers 

 lamellar, and spoon-excavate at the extremities. Second pair 

 longer and more slender, wrist of normal shape. Hand similar 

 to that of first pair. 



