AUSTEALIAN MALACOSTRACA. 309 



border marked behind tbe middle by an angular notch, bounded 

 behind by an inconspicuous acute spine ; a short, rounded mesial 

 lobe at the posterior extremity. Eyes narrow, oblique. Internal 

 antenna? scarcely as long as the three basal joints of the external 

 pair, flagellum longer than the peduncle. External antenna? 

 about four times as long as the inner pair, longer than the body; 

 basal joint of the peduncle produced externally and distally into 

 a slender acute process ; second joint similarly produced, the 

 process ending in a hair-like appendage ; flagellum about equalling 

 the peduncle in length, formed of numerous articuli which are 

 very short proximally and increase slightly in length towards the 

 distal end. Maxillipedes with the four basal joints forming a 

 broad operculum ; terminal joint well-developed. Eirst pair of 

 thoracic limbs in the male very large ; ischium, meros and carpus 

 sub-equal, the meros produced infero-distally into an acute pro- 

 cess ; propodos large, irregularly ovate, palm defined by a long 

 acute spine, and armed in addition with a bifid denticle situated 

 about its middle ; dactylos powerful, sub-acute. Eollowing pairs 

 of thoracic limbs sub-equal. Inner ramus of caudal appendages 

 longer than the outer, both lanceolate, armed laterally with 

 slender hairs. Length f inch. 



The female has the first pair of thoracic limbs smaller than in 

 the male, the palm unarmed, concave, defined by a projecting 

 acute angle. 



Port Jackson ; Port Stephens ; Griffiths' Point (Victoria). 



53]. Stenetrium inerme. 



St e net Hum inerme, Haswell, 1. c, p. 180, pi. xix., fig. 2. 



Head transverse, rostrum sub-acute. Lateral borders of 

 anterior thoracic segments not much produced, bilobed. Lateral 

 border of last abdominal segment entire ; with an obscure, 

 rounded, mesial lobe. Eyes rounded. Internal antenna? very 

 slender, less than a quarter of the length of the external pair ; 

 basal joint of the peduncle very short and broad, second narrower 

 and slightly longer, third scarcely distinguishable from the 

 flagellum ; flagellum about twice as long as the peduncle. 

 External antenna? longer than the body, the three basal joints of 

 the peduncle short and stout, the third the longest of the three, 

 and provided distally and externally with a short, acute spine ; 



