REPORT ON THE CUMACEA. 19 



several slender bristles ; similar bristles are also found along the inner edge of the pro- 

 podal joint. 



The four remaining pairs of legs are all very small, and, in both sexes, quite simple, 

 without any trace of exopodites. They represent the true ambulatory legs, and for this 

 purpose are also turned more exteriorly. 



The anterior of these pairs (fig. 17) are somewhat shorter than the succeeding pair, 

 but have the coxal joint very large (see figs. 1, 2), forming an almost semicircular plate 

 firmly connected with the corresponding segment. Of the other joints the basal is as 

 usual the largest. The carpal joint is obliquely truncate at the apex, or produced 

 on the outer side to a blunt process bearing two stiff bristles. The propodal joint is 

 extremely small, whereas the terminal is rather large, compressed, and armed at the tip 

 and aloug the outer edge with six short spines. 



The three posterior pairs of legs (figs. 18, 19) are quite similar in structure, de- 

 creasing, however, somewhat in length, owing to the basal joint being shortened succes- 

 sively. The coxal joint in all of them is very small and scale-like; the four outer joints 

 successively decrease in size, and the terminal joint has the form of a simple biarticulate 

 spine. A few strong bristles originate from the tip of each joint. 



The ventral limbs of the tail are, as usual, completely wanting in the female (fig. 3). 

 In the young male (fig. 1) there are five pairs of imperfectly developed pleopoda, con- 

 sisting of a stout basal segment and two short branches without distinctly developed setae. 



The uropoda (see fig. 20) are about twice as long as the last caudal segment, with the 

 basal part or scape almost cylindrical or slightly dilated towards the apex. The terminal 

 branches are both lanceolate in form and at the apex drawn out to a sharp point. The 

 inner one is the shorter, about as long as the scape, and uniarticulate, with the inner 

 edge finely serrulate ; the outer branch is distinctly biarticulate, with the first joint very 

 short, and the inner edge of the second joint setiferous. 



Habitat. — Several specimens of this form were collected on April 1, 1874, off the 

 entrance to Port Philip, Australia, Station 161, from a depth of 38 fathoms; sandy 

 bottom. 



2. Cyclaspis pusilla, n. sp. (PL I. figs. 21-23). 



Specific Characters. — %. Carapace almost globular, quite smooth at the sides, dorsal 

 line evenly curved ; pseudorostral projection very short and obtuse. Ocular lobe only 

 slightly produced, its outer part swollen and provided with well-developed visual 

 elements. Tail slighty keeled dorsally, but elsewhere quite smooth. Limbs much as in 

 Cyclaspis australis. Colour whitish, anterior part of body mottled with brownish-pink. 

 Length of adult female only 3^ mm. 



Remarks. — This beautiful little form is readily distinguished from the preceding 



