478 ON SOME NEW AUSTRALIAN MARINE ISOPODA, 



of caudal appendages ovate, sub-acute, liaiiy. Terminal segment 

 rounded. Length about ^ an inch. 



Sah. Port Jackson. 



Paranthura (?) crassicornis, sp. nov., Plate XVIII., fig. 5. 



Eyes very small. Internal antennje very short, about haKthe 

 length of the head; flagellum with several short articuli. External 

 antennae twice as long as the internal pair ; flagellum thick, twice 

 as long as the peduncle, composed of numerous articuli. First 

 pair of thoracic limbs larger than the others ; propodos ovate. 

 Second and third pairs rather smaller than the first, and of similar 

 shape. Following pairs sub-equal, with the dactylos long and 

 falciform. Length 5/16 inch. 



JS^ah. Port Jackson. 



Differs from Paranthura in the form of the outer antennae. 



Genus Steneteium f novum J. 



Body dorso-ventrally compressed; abdomen short, one-jointed. 

 Head with a short rostrum. Antennae inserted on the anterior 

 margin of the head ; internal pair very short ; external pair very 

 long, both with well-developed flageUa. Mandibles provided 

 with a palp. Maxillipedes expanded, operculiform. First pair 

 of thoracic limbs with a large prehensile manus ; following pairs 

 ambulatory. First pair of abdominal appendages broad, 

 operculiform. Caudal appendages biramous, inserted on the 

 border of the shield-like abdomen near the extremity. 



Stenetrium armatum, sp. nov.., Plate XIX., fig. 1. 

 Cephalon armed on either side with a prominent dorso-ventraUy 

 compressed, acute spine, curved outwards and forwards. Antero- 

 lateral angles of the first thoracic segment produced forwards, 

 acute ; those of the second segment slightly produced ; postero- 

 lateral angle of the penultimate segment slightly produced 

 backwards. Penultimate segment of the abdomen rudimentary ; 



