14 G. O. Sars. 



The eye (see fig. 2) is not very large, and exhibits a 

 number of well-defined crystalline bodies projecting from 

 the dark pigment. 



The ocellus (ibid.) is very small, punctiform, and occurs 

 near the insertion of the antennulæ. 



The latter appendages (ibid.) exhibit the usual structure, 

 and this is also the case with the antennæ (see fig. 1). 



The tail v fig. 3) is remarkably broad, and differs from 

 that in other species by the production of the posterior 

 edge, above the anal sinus, to a nearly rectangular gibbous 

 expansion. The anal sinus itself is defined above by a 

 rather small, obtusangular corner, and is armed on each 

 side with about 12 denticles, successively rapidly increasing 

 in length distally. The terminal claws are nearly straight, 

 and each armed in their basal part with a regular, comb- 

 like series of well-marked secondary teeth. 



The number of eggs in the matrix is often very great, 

 amounting to more than 50 in all. 



Young specimens have the acute projection of the front 

 as distinct as in the adults, and only differ in their smaller 

 size, and in the dorsal margin of the shell not being con- 

 vex, but nearly straight. 



Occurrence. — Mr. King found this form in ponds at 

 Denham Court. In one of the gatherings kindly sent me 

 by Mr. Whitelegge, and taken from Waterholes at Bourke 

 Street, this species occurred rather abundantly, and it was also 

 found in another sample probably from the same locality. 



Though some ephippia apparently of this form were 

 detected in the mud sent me from the said place, I did not 

 succeed in hatching this form in my aquaria. As, however, 

 the spirit-specimens sent were in a very good state of pre- 

 servation, a minute examination could be instituted, especi- 



