On Fresh-water Eiitornostraca. 45 



The antennulæ are comparatively short and thick, 

 scarcely extending beyond the middle of the rostrum. 



The antennæ are rather small, and of the usual structure. 



The tail (fig. 8) is comparatively narrow, and somewhat 

 resembles in form that in A. excisa, not being at all 

 expanded distally, and having the tip narrowly truncated. 

 The post-anal angle is well defined, though not very pro- 

 minent, and the ante-anal denticles are very small, almost 

 hair-like, and present to the number of about 10 pairs. 

 The terminal claws are not very strong, and have each a 

 minute secondary denticle at the base. 



Occurrence. — Some specimens of this small Lynceid 

 were picked up from a sample taken by Mr. Whitelegge 

 from the Marubra Swamp, near Sydney. The specimens 

 were of a very dark grey hue. 



Gen. Camptocercus, Baird. 



20. Camptocercus australis, G. O. Sars, n. sp. 

 (PI. 6, figs. 9, 10). 



■ Specific Characters. — ^ Shell highly compressed 

 and, seen laterally, of oblong form, broadest in front, poste- 

 rior extremity narrowly rounded, dorsal margin evenly con- 

 vex, ventral bulging anteriorly, straight behind. Head rather 

 large, crested, terminating in a deflexed, blunt rostrum. 

 Surface of shell longitudinally striated; inferior edges cili- 

 ated in the middle and not exhibiting any trace of denticles 

 at the infero-posteal corners. Eye small; ocellus still 

 smaller, both occurring at a rather considerable distance 

 from the anterior edge of the head. Tail very slender and 

 elongated, conically tapering distally, post-anal angle well- 



