1888.] AUSTEALIAN CLADOCEEA. 51 



truncate, outer part finely ciliate along the dorsal edge and 

 having a lateral series of very delicate lamellar appressed den- 

 ticles; supraanal angle very slight; caudal claws of moderate length, 

 with a very minute secondary denticle at the base. Colour pale 

 yellowish brown or corneous. Length of adult female 0,40 mm. 



Remarks. — The present Lynceid agrees on the whole, as 

 regards the form of the shell, pretty well with the figure given 

 by King of his Alona Kama; and though the tail in his draw- 

 ing looks somewhat different, I am inclined to regard both these 

 forms as identical. It is undoubtedly congeneric with the preced- 

 ing species, though easily distinguished alike by the form and 

 the sculpture of the shell. 



Description. — The length of the adult female does not ex- 

 ceed 0,40 mm, and hence it is somewhat smaller than the pre- 

 ceding species. 



The carapace, as in the latter, is very much compressed, 

 but exhibits in a lateral aspect (PI. 5, fig. 8) a rather different 

 form, being nearly quadrangular, with the posterior part ab- 

 ruptly truncate and somewhat narrower than the anterior. The 

 dorsal edge has its greatest curvature anterior to the middle 

 and terminates posteriorly with a well-marked angle. Also the 

 infero-posteal corners of the valves are somewhat angular, though 

 less so than the superior corner. The inferior edges project 

 considerably in the middle, their anterior halves ascending ab- 

 ruptly towards the infero-anteal corners. The head is rather 

 depressed, with the dorsal edge but slightly arcuate and con- 

 tinuous with the dorsal edge of the carapace ; it terminates in a 

 rather prominent acute rostrum, projecting beyond the inferior 

 edges of the valves. 



The surface of the shell is very distinctly sculptured with 

 rather distant and sharply defined striae, running on the posterior 

 part of the carapace longitudinally, quite straight, and not ana- 

 stomosing with each other; inferiorly they become successively 

 somewhat oblique, pointing towards the infero-posteal corners. 

 On the anterior part of the valves, the striae, as in the preced- 

 ing species, curve obliquely upwards, the most anterior running 



