438 ON THE AUSTRALIAN BRACHYURA OXYRHYNCHA, 



pointed tubercles ; anterior portion of the cardiac region rounded, 

 separated, together with tlie urogastric region, from the branchial 

 by a broad, low, sinuous ridge which broadens out anteriorly to 

 form a smooth, pear-shaped elevation on the inner part of the 

 branchial region, and breaks up behind into a number of small 

 rugae ; branchial regions dilated, each with two ovate flattened 

 tubercles situated close together towards the centre, and three 

 spinous tubercles towards the lateral margin. Rostrum slightly 

 deflexed ; cornua triangular, pointed, slightly divergent. Eyes 

 non-retractile ; orbits incomplete, the upper orbital border ending 

 behind in a minute acute tooth, and followed by two convergent 

 spines separated by open fissures. Epistome short. Basal joint 

 of the external antennae about twice as long as broad, concave 

 from side to side, with a thin outer lip, slightly notched in front, 

 more prominent behind, forming the lower rim of the orbit ; a 

 small tooth at the antero-internal angle. External maxillipedes 

 with the third joint produced and rounded at its antero- external 

 angle, the internal angle acute. Arm (in the male) with a dorsal 

 ridge ; wrist carinate above ; hand slightly dilated, smooth ; 

 fingers slender, pointed, two-thirds of the length of the palm, 

 the mobile finger with a large rounded tooth near its base and a 

 row of denticles in its distal half ; immobile finger with the inner 

 border concave proximally, with a single, small tooth near the 

 base, straight distally and armed with a row of small denticles. 

 Ambulatory legs covered above with slender hairs, terminal joint 

 slender, hooked, armed below with a row of fine denticles ; first 

 pair longer than the body, the rest successively decreasing in 

 length — the last pair shorter than the post-frontal region of the 

 carapace. Abdomen, in the male, with all the segments distinct. 

 Length of carapace and rostrum fourteen lines, breadth nine and 

 a-half lines. 



Hal. Port Jackson. 



Fam. II. MAIIDJE. 



Genus Egeria, Latr. 



