AUSTRALIAN MALACOSTEACA. 281 



Sub-Family Ligiince. 



External antennae not decidedly geniculate at the fifth joint, 

 terminating in a multi-articulate fiagellum. Base of the caudal 

 appendages very long and exserted, with two long setif orm rami. 

 Maxillipedes four-jointed, elongated. 



Genus Ligia, Eabr. 



Carapace but slightly convex, nearly oval, with the abdominal 

 segments narrower than those of the thorax. Head small. 

 External antennae very long. Internal antenna? rudimentary. 

 Base of the caudal appendages not furcate at the apex, elongated, 

 with two slender styliform rami. 



485. Ligia australiensis. 



Lygia australiensis, Dana, U. S. Explor. Exped., Crust., ii., 

 p. 740, pi. xlix., fig. 3. 



Abdomen with the three segments before the last but little 

 prolonged backwards on either side, and the sides of the penul- 

 timate not reaching half-way to the angles of the last segment. 

 Postero-lateral angles of the last segment very short, acute, and 

 not reaching beyond the low tooth on the posterior margin at 

 the base of the stylets. Body rather narrow, and surface fine 

 granulous all over, the granules scattered. [Dana.] 



New South Wales. 



Sub-Tribe Ctmothoidea. 



Body usually broad and convex. Abdomen large, the last 

 segment often scutiform. Caudal appendages broad, often 

 lamellate or falciform, natatorial and applied to the sides of the 

 last segment. 



Family GYMOTHOIDJE. 



Body convex. Abdomen 4-6 jointed, the anterior segments 

 rarely coalescent. Epimera conspicuous. Antenna? inserted 

 beneath the head. Maxillipedes short, 3-4 jointed, operculiform, 

 the terminal joints narrow and short. All the feet terminating 

 in a large curved claw. Caudal appendages free, the margins 

 rarely ciliated. 



