TEESHWATEE SHELLS OF AUSTRALIA. 271 



Hff5. Richmond Eiver, New South Wales, and Alert River, 

 Queensland ( TF. F. Petterd) . 



36. Htdrobia Axgasi, n. sp. (Plate VII. fig. 22.) 



Shell ovately conical, narrowly rimate, smooth, yellowish olive, 

 shining, covered with a blackish earthy deposit. "Whorls 5, 

 convex. Aperture ovate, oblique. Peristome continuous, free 

 from the last whorl, the right margin being very slightly expanded. 



Length 85 millim., diam. 1| ; aperture 1^ long, 1 broad. 



Operculum with a subcentral nucleus, paucispiral, horny, with 

 a callosity on the inner surface, from the centre of which arises an 

 apophysis which is directed towards the inner or columellar edge. 



Hab. Compasely River, "Victoria. 



The operculum differs from that in Eatoniella Jcerguelenensis 

 in having the nucleus more central ; and notwithstanding its 

 differing from the normal or typical form of the operculum 

 in Hydrohia, at present I deem it advisable not to separate the 

 species generically on that account alone. 



Genus LiMKiEA. 



37. LiMNiEA (Amphipeplea ?) Lessoni, Desliayes. 



Limnea lje%%om,Deshayes, Magasin deZool. 1830, p. 16, figs. 1-2; Lesson, 

 Voy. Coquille, Zool. pi. xv. fig. 1 ; id. Centurie Zoologique, pi. xHv. ; 

 Kilster, Con. -Cab. pi. v. figs. 16-1 7- 



Lymnsea Lessonii, Desk., Lesson, Centurie Zoologique, 1830, p. 120, 

 pi. xliv. (shell and animal). 



Neristoma Lesson!, Desk., Chenu, Man. de Conch, vol. i. fig. 3542. 



Lvmnea perlevis, Conrad, Proc. Acad. Nat. Sci. Philad. 1850, vol. v. 



"p- 11- 



Amphipeplea perlevis, Conrad, American Journ. Conch, vol. ii. p. 80, 



pi. i. fig. 5. 

 Amphipeplea Strangei, Pfeiffer, Malak. Blatt. 1854, p. 64 ; Novitat. 



Conch. 1854, p. 6, pi. ii. figs. 5 &c &; Kilster, Con.-Cab. p. 60; 



Sowerby, Con. Icon. fig. 40 (Limnsea). 

 Amphipeplea melbournensis, Pfr.*, Novitat. Conch, p. 70, pi. xix. 



figs. 14-15; Sowerby, Con. Icon. fig. 38 a-6 (Limnaea). 

 Limnsea globosa, Sowerby, Con. Icon. fig. 84. 



H.ah. New Holland (^Deshayes) ; Macquarie River {Lesson); 

 Salamanca and Balonne Rivers, New South "Wales {Conrad)', 

 Moreton Bay, Queensland (Zyei^er) ; Melbourne, Victoria {Pfr.) ; 



* Pfeiffer, in the ' Novitates,' I. c, gives a reference to Proc. Zool. Soc. 1856 ; 

 but I have carefully searched the volume in question, indeed the entire series of 

 the ' Proceedings,' but cannot flndany mention whatsoever of an A. melbournensis. 

 lilKK. JOUEN. — ZOOLOGY, TOL. XVI. 19 



