BY W. A. HASWELL, M.A., B.Sc. 479 



second as long as the three last thoracic segments, its lateral 

 border marked behind the 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 

 antennae scarcely as long as the three basal joints of the external 

 pair, flagellum longer than the peduncle. External antennae 

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

 basal joint of the peduncle produced externally and distall}^ 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. First pair of 

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

 sub-equal, the meros produced inf ero-distally into an acute process; 

 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. Following pairs of 

 thoracic limbs sub-equal. Inner ramus of caudal appendages 

 longer than the outer, both lanceolate, armed laterally with 

 slender hairs. Length ^ 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. 



Hal. Port Jackson, among algse a few feet below low- water 

 mark. 



Stenetrium inerme, sp. nov., Plate 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 antennae very slender, less 

 than a quarter of the length of the external pair ; basal joint of 



