AUSTRALIAN HALACOSTRACA. 215 



lower border convex, and the propodos having a longitudinal, 

 hairy ridge. 



Tasmania (K. Broadbent.) 



Genus Talorchestia, Dana. 

 Differs from Talitrus in having the first pair of gnathopoda 

 subcheliform in the male, as in Orchestia, and the second 

 developed largely, as in the male of Orchcstoidea and Orchestia, 

 whereas in the female the first gnathopoda are simple as in 

 Talitrus, and the second feeble and unimportant as in the normal 

 Talitri. 



393. Talorchestia diernenensis. 



Talorchestia diernenensis, Haswell, 1. c, vol. iv., p. 248, pi. vii., 

 fig. 6. 



Superior antenna? equalling the cephalon in length. Inferior 

 antenna? equal in length to the cephalon and first three segments 

 of the pereion, the third joint short, the fifth the longest ; 

 flagellum subequal with the peduncle, fringed with short hairs. 

 Anterior gnathopoda in the male with the carpus broad distally, 

 the propodos quadrangular, twice as long as broad, the palmar 

 border transverse, slightly sinuous, the dactylos short ; in the 

 female with both carpus and propodos narrower than in the male, 

 the palmar border with a deep mesial notch, the dactylos well- 

 developed. Posterior gnathopoda in the male large, the propodos 

 compressed, irregularly cordif orm, with the palm oblique, defined 

 by a rounded tooth ; in the female small, imperfectly subcheliform, 

 the propodos narrow, nearly thrice as long as broad, parallel- sided, 

 with the palm oblique, the dactylos rudimentary. Pereiopoda 

 setif erous ; third pair much shorter than fourth and fifth. Telson 

 triangular, blunt. Length 3 lines. 



Tasmania (Macleay Museum). 



394. Talorchestia quadrimana. A.M. 

 Orchestia quadrimana, Dana, Proc. Amer. Acad. Sci. Bost. ii., 



204 ; U.S. Exploring Exp'ed. Crust, ii., p. 879, pi. lix., fig. 7 ; 

 Spence Bate, Cat. Amph., p. 31, pi. v., fig. 3. 



Talorchestia quadrimana, Haswell, 1. c, vol. iv., p. 248, pi. vii., 

 fig. 3, and vol. v., p. 100, pi. (3, fig. 1. 



Male. Coxa? deep. Eyes large, round. Inferior antennae 

 exceeding in length the cephalon and two first segments of the 



