212 ATJSTEAilAir MAIACOSTBACA. 



Anterolateral angles of rostrum produced into spines, which 

 are nearly as long as the median spine. Fifth abdominal segment 

 longitudinally corrugated ; sixth apparently coaleseent with the 1 

 telson, and armed with six convex tubercles. Telsoh armed 

 above with three convex rounded tubercles disposed in a triangle ; 

 behind these the upper surface marked with impressed lines 1 j 

 posterior margin with a median notch, and divided by narrow 

 fissures into about six truncated lobes. Stylif orm termination of 

 the dactyli of the raptorial limbs short, unarmed. Outer of 

 the spines of the basal prolongation of the uropoda larger than 1 

 the inner, and arhied with a tooth on its inner margin. Length 

 about li in. [M.] 



Swan River ; Shark's Bay. Found also at Fiji and Auckland. 



II. EDRIOPHfHALMATA. 



Malacostracous Crustacea with mandibles and fftaxillipedes 

 adapted for mastication, sessile eyes', and destitute of a carapace. 



Tribe I. AMPHIPODA. 



Body rounded above, and laterally compressed; the seven pair 

 of thoracic legs consisting of an anterior series' of four pairs' (of 

 which the first two have a more or legs perfectly chelate' hand); 

 and a posterior series of three pairs. Branchial vesicles pendent 

 from the thoracic limbs. Segments of the abdomen distinct, the 

 abdomen usually elongated, but sometimes rudimentary. Abdo- 

 minal appendages of the first three segments elongate, ciliated 

 and flexible ; of the three succeeding pairs stylif orm, terminal 

 segment small, or rudimentary. 



Group Normalia. 



Coxse of the pereiopoda squamiformly developed, generally 

 large enough to protect the branchial sacs. Pleon normally 

 developed. Three anterior pairs of pereiopoda consisting of 

 ciliated, double-branched, multi-articulate, flexible appendages, 

 whieh are used in swimming, and originate' oU the ventral 

 surface,. Three posterior pairs of pleopoda consisting of stiff, 

 generally double-branched stylets* of which the last pair vary 

 more than the others, and sometimes have the spines developed 



