270 



MR. E. A. SMITH ON THE 



angular on the right or labral side. Its operculum is horny, 

 brown, and littorinoid in character, consisting of about two and a 

 half whorls, 



I have much pleasure in associating this interesting form with 

 the name of Mr. Brazier, who has sent a large series of it to the 

 Museum. 



34. 'H.YDRO'BiA.Yic'roni^,Tenison-Woods. (Plate VII. fig. 20.) 

 Bythinia victorise, Tenison- Woods, Trans. Roy. Soc. Victoria, 1878, 



vol. xiv. p. 65. 

 Bythinella victoriae, Tenison-Woods, Proc. Roy. Soc. Tasmania, 1878, 



p. 71. 



Shell small, ovately conical, narrowly rimate, horn-colour, lon- 

 gitudinally striated, covered with a blackish earthy deposit. 

 Whorls 5, smooth, very convex, separated by a deep suture. 

 Apex rather obtuse. Aperture small, obliquely ovate, a trifle nar- 

 rower above than below, but not acuminate, occupying about two 

 fifths of the whole length of the shell. Peristome continuous and 

 free from the whorl. Operculum horny, paucispiral. 



Length 3 millim., diam. 1^ ; aperture 1-^ long, | wide. 



Hah. St. Kitts, South Australia {Angas); Lake Connewarre, 

 Greelong {Tenison-Woods). 



I do not feel quite certain that the operculum is not slightly 

 shelly ; if so, the calcareous deposit is very thin indeed. Several 

 specimens have been presented to the Museum by Mr. G. F. 

 Angas. I am not absolutely certain that the specimens, the 

 description of which is given above, are, without doubt, the By- 

 thinia victoricB of Woods. However, the diagnoses agree in many 

 respects ; and I prefer to leave the question to be decided by com- 

 parison of specimens to giving a new and possibly unnecessary 

 name. 



85. Htdeobia Petteedi, n. sp. (Plate VII. fig. 23.) 

 Shell very small, pale horn-colour, rimate, subpupiform, semi- 

 transparent, rather glossy, smooth. Whorls 4-5, very convex, 

 and divided by a very deep suture; body-whorl only a trifle 

 broader than the preceding. Aperture small, ovately circular, a 

 little oblique, occupying about two sevenths of the entire length. 

 Peristome continuous, free from the whorl. Operculum horny, 

 thin, paucispiral. 



Length 2 millim., diam. 1|. 



