AUSTEAEIAN MALACOSTEACA. 215 



lower border convex, and the propodos haying a longitudinal, 

 hairy ridge. 

 Tasmania (K. Broadbent.) 



G-enus Talobchestia, 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 Orchestoidea 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 diemenensis. 



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

 fig. 6. 



Superior antennae equalling the cephalon in length. Inferior 

 antennae 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 cordiform, 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 ; TT.S. Exploring Exped. 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. 6, fig. 1. 



Male. — Coxae deep. Eyes large, round. Inferior antennae 

 exceeding in length the cephalon and two first segments of the 



