AUSTRALIAN MALACOSTBACA. 5 



Carapace sub-pyriform and convex, upper surface without 

 Bpines or tubercles. Rostrum deflexed ; the spines of which it 

 is composed small, flattened, acute, and separated by a narrow 

 fissure. Immediately behind the eyes are two small blunt 

 prominences ; and a third, at a little distance, represents the 

 post-ocular spine. There are two very small tubercles at the 

 distal end of the slender basal antennal joint. The second and 

 third joints are not, as in J3. lucasii, very broad, but cylindrical. 

 Anterior legs (in the female) very slender and smooth. Both 

 the body and legs are pubescent. Length of carapace five-sixths 

 of an inch. [ilT.] 



N.E. Coast of Australia (Cuming). 



Grenus Oncinopus, De Haan. 



Carapace elongate-triangular. Rostrum very short ; front 

 emarginate. Basal antennal joint very short, the next longer. 

 Merus-joint of outer maxillipedes elongated and articulated with 

 the next at its summit. Ambulatory legs slender, the penulti- 

 mate joints of the first and second pairs more or less dilated and 

 compressed, the fifth somewhat raised upon the dorsal surface. 



7. Oncinopus subpellucidus. A.M. 



Oncinopus subpellucidus, tStimpson, Proc. Acad. Nat. Sci., 

 Philad., Vol. ix., p. 218. 



Oncinopus angulatus, Haswell, Proc. Linn. Soc. N.S.W., 

 Vol. iv., p. 433. 



Carapace much depressed behind. A low angular elevation on 

 the hepatic region. Rostrum very short ; frontal region with a 

 well-marked mesial furrow. Eye-peduncles as long as the front. 

 Arm trigonal, wrist smooth, rounded ; fingers as long as the palm, 

 slightly incurved, acute, toothed, meeting throughout their entire 

 length. Second pair of limbs three times as long as the post- 

 frontal region of the carapace ; dactylus filiform. Following 

 pairs of limbs decreasing in length backwards, dactyli falciform. 



Port Jackson ; Port Stephens ; Port Molle ; Cape Grenville. 

 Common at a depth of four or five fathoms. 



Grenus Halimus, Latreille. 



Carapace sub-triangular, with lateral marginal spines. Rostrum 

 long, formed of two diverging cornua. Three spines above the 



