38 G-. 0. Sårs. 



terminating in an acute rostrum. Surface of shell faintly 

 striated longitudinally. Ocellus much smaller than the eye. 

 Tail comparatively short and of uniform breadth, trans- 

 versely truncated at the tip, with the posterior corner well 

 defined, postanal angle distinct, though obtuse, posterior 

 edge below it perfectly straight and armed with a double 

 row of very delicate denticles, in front of which there is 

 on each side a lateral series of still more delicate, squami- 

 form spinules, terminal claws rather elongated, each with a 

 distinct secondary denticle at the base. Length of adult 

 female 0,58 mm. 



Remarks — This is, as I believe, the form originally 

 recorded by Mr. King under the above name. It is closely 

 allied to another Australian species described by the present 

 author from the northern part of the country as A. lœvissima. 

 But in the latter form, as indicated by the specific name, the 

 shell is perfectly smooth, whereas in the present species it 

 exhibits the usual longitudinal striation. 



Description of the female. 



The length of adult, ovigerous specimens does not 

 exceed 0,58 mm., and is accordingly rather inferior to that 

 of the preceding species. 



The form of the shell, when seen laterally (fig. 3), is 

 oblong quadrangular, being scarcely wider behind than in 

 front. The posterior extremity appears obtu *ely truncated, 

 with both the upper and lower corners rounded off, the 

 latter being the more prominent. The dorsal margin is 

 quite regularly arcuate until the tip of the rostrum, and 

 has its greatest curvature about in the middle, whereas the 

 ventral one appears almost straight and horizontal. The 

 head is less procumbent than in the preceding species, 



