101 



Rissopsis buliminoides, spec. nov. 



Shell small, cylindroid, thin, opaque-white. Whorls six, flatly 

 •convex, sculptured with faint axial striae of growth; suture 

 linear, but well-defined. Pullus hyaline, depressedly rounded, 

 forming a small abrupt papillary summit, tip immersed. Aperture 

 oval ; peristome entire, the callous growth on the parietal wall 

 somewhat explanulate ; columella with a slight torsion over a 

 minute umbilical chink. 



Length, 4-25; breadth, 1*3 mm. 



Federick Henry Bay, Tasmania, 10 fathoms, W. L. May. 



Rissopsis eonsobrina, spec. nov. 



Elongate, turreted, hyaline (in a fresh state), with rounded 

 whorls and a deep suture, sculptured with curved growth-lines. 

 Aperture elongate-oval, somewhat explanulate, columella-lip very 

 thin and exsert. 



Its turreted form, rounded whorls, and elongate-oval aperture 

 distinguish it from R. buliminoides. 



Length, 3*5 ; width, 1*0 mm. 



Federick Henry Bay, Tasmania, common, W. L. May. 



Cyelostrema popcellana, spec. nov. 



Shell oval-conic, moderately stout, smooth, shining, opaque- 

 white. Spire-whorls three and a-half, convex, sloping gently 

 from the posterior one-third, more abruptly to the anterior suture, 

 faintly marked b}^ oblique striae. Pullus of one and a-half 

 whorls, translucent, depressedly convex. Periphery of last whorl 

 roundly angulated. Aperture roundedly-oval, oblique ; peristome 

 incomplete; outer lip rather thin; columella slightly exsert, but 

 not reflected over a minute umbilicus. Six examples. 



Length, 1*8 ; breadth, 1*3 mm. 



This species is more conic than such related forms of Tubiola 

 as C. australe, C. contabulatum, and C. micron. 



Frederick Henry Bay, Tasmania ( W. L. May). 



ZidOPa LoddePSe, nom. mutand. 



Z. Tasmanica, Hedley, P.L.S., N.S. Wales, 1900, p. 93, three 

 woodcuts; non Beddome, 1883. 



This species is closely related to the Japanese Z. reticulata ; 

 and judging from Reeve's figure of that shell, the Tasmanian 

 congener differs by relatively greater width. 



The shell which Tate rightly attributed to Beddome's species, 

 and described under the name of Z. Leyrandi, T.R.S., S. Aust., 

 XVIII. , p. 118 , 1894, differs from other known species by its 

 apex situated far within the vertical plane of the posterior 

 .margin. 



Tasmania (Miss Lodder); N.S. Wales (apud Hedley). 



