Descriptions of some Australian Phyllopoda. 29 



form dark brown. Length of adult female 9 mm,, of male 

 about the same. 



Remarks. The present species looks, as to the shell, 

 very like the European form E. tetracea, Krynicki, or perhaps 

 still more the E. cydadoides of Joly, as figured by Grube in 

 his treatise on Phyllopoda, but may be distinct from any of 

 them. There is, however, another species recorded by Baird 

 from India as E. Soysii, which, according to the figure of 

 the shell given, hardly admits of being specifically distinguished 

 from the present form. If this be the case, the name proposed 

 by Baird, as the much older one, ought to be retained for 

 the species. 



Prof. Brady records another Australian species under the 

 name of E- lutraria. The Estheria JBirchii of Baird is, on 

 the other hand, evidently not an Estheria, but, as above noted 

 more properly a Eulimadia, or perhaps the type of a new 

 genus nearest allied to the latter. 



Description of the female. 



(PL 4.) 



The length of the shell in fully grown specimens measures 

 about 9 mm., the height being not fully 6 mm. 



As compared with that in Eidimadia, the shell appears 

 rather tumid, and is also of much firmer consistency, though 

 the valves, to a certain degree, are flexible and not con- 

 nected dorsally by any true hinge. 



When seen from the side (fig. 1), the shell exhibits a some- 

 what irregular oval or elliptic form, with the umbones well 

 defined and slightly prominent, occurring far in front, about 

 at the end of first 4th part of the length of the shell. The 

 dorsal margin is almost straight and horizontal, whereas the 

 ventral one is gently arched, joining both the anterior and 

 posterior edges by an even curve. The anterior extremity is 



