248 Proceedings of the Royal Society of Victoria. 



processes ; caudal claws almost straight, and feathered for most 

 of their length. Male with rostrum short and acute ; suhapical 

 cylindric appendage to hands two-jointed. — dahli. 



Sha|)e of shell rather like preceding species, although deeper 

 and snbtruncated in front, never produced in front of the 

 anterior end of the hinge as in following species, back of female 

 generally greatly vaulted ; lines of growth about four, meeting 

 closely together at antero-dorsal angle ; caudal claws slender, 

 feathered for not more than half their length.- — vicioriensis. 



Shell in front produced in a broadly rounded curve somewhat 

 beyond the level of the end of the hinge, never immediately 

 receding therefrom ; rostral expansion of male very long and 

 usually bluntly rounded ; subapical cylindric appendage of hands 

 three-j ointed. — rivolensis. 



This species may be a synonym of sordida. 



Genus 2 — Papalimnadia, G. O. Sars. 



This genus has been suggested by Sars for the following 

 species, but so far is undefined by a description. 



Paralimnadia stanleyana, King. (PI. XXXIV., Fig. 2 a, b). 



Limnadia stanleyana, King. Proc. Roy. Soc. Van Diemen's 

 Land, 1855. 



Limnadia stanleyana. King. Trans. Entom. Soc. N. S. Wales, 

 vol. i., p. 162, pi. xi. 



Limnadia stanleyana, Glaus. Ueber den Korperbau einer 

 australischen Limnadia und iiber das Mannchen derselben. 

 Zeitschr. f. wissensch. Zoologie, Bd. 22, 1872, p. 355, pi. xxix. 

 and XXX. 



Eulimnadia stanleyana, Sars. Arch, for Math, og Naturvid, 

 Christiania, xvii., pt. 2, No. 7, pp. 16-28, pis. 2 and 3. 



Paralimnadia stanleyana, Sars. Id., xviii.. No. 8, p. 15. 



Specific Characters. — Shell much compressed, and, seen from 

 the side, in fully grown females, subtriangular in form, umbones 

 very prominent and occurring much nearer the anterior than 

 posterior extremity, dorsal margin obliquely declining, ventral 

 margin strongly curved in the middle, anterior extremity short, 



