AUSTEALIAN MALACOSTRACA. 311 



peduncle thick, shorter than the others ; second joint the longest ; 

 flagellum shorter than the second and third segments of the 

 peduncle. Inferior antennae more than half the length of the 

 superior; peduncle more than twice as long as the flagellum. 

 First pair of gnathopoda with the propodos broad, the palm 

 oblique, slightly convex, armed with a series of short spines, and 

 defined by a strong tooth surmounted by a spine. Posterior 

 pair with the propodos ovate, swollen, three times as long as that 

 of the first pair. First pair of pereiopoda slender, as long as 

 the second and third segments of the pereion, with a slight tooth 

 on the posterior margin of the propodos. Second pair much 

 larger than the first or third, rather longer than the cephalon 

 and the first two segments of the pereion, the carpus, propodos 

 and dactylos short, the propodos armed with four spines and a 

 row of serrations on its anterior border. Third pair very slender, 

 equal to the first in length. Fourth and fifth pairs sub-equal, 

 of the same length as the second, but stouter ; a few spines on 

 the carpus and propodos. Length about 7 lines. 



Port Jackson. 



Genus Protella, Dana. 



Body cylindrical. Cephalon confluent with the first segment 

 of the pereion. Pleon rudimentary. Mandibles having an 

 appendage. Griiathopoda sub-chelate. First two pairs of 

 pereiopoda rudimentary, having branchiae attached ; three pos- 

 terior pairs subequally robust and long. Anterior pair of 

 pleopoda rudimentary in the male ; rest obsolete. [#.i?.] 



533. Protella australis. 



Protella australis, Haswell, 1. c, p. 276, pi. xii., fig. 4. 



Cephalon armed above with a single short, anteriorly-directed 

 spine. Superior antemue nearly as long as the body ; peduncle 

 stout ; the second joint the longest ; flagellum as long as the last 

 segment of the peduncle. Inferior antennas as long as the first 

 two segments of the peduncle of the superior pair ; flagellum very 

 short. First pair of gnathopoda with the propodos sub-triangular, 

 broad at the base, which is nearly straight, with straight, gradually 

 converging lateral borders ; dactylos more than two-thirds of the 

 length of the propodos. Posterior gnathopoda with the propodos 



