OF NEW SOUTH n'ALES. 139 



Shell small imperforate, elongately ovate, shining, Rub-diaph- 

 anous, yellowish horn, covered more or less with a sooty peri- 

 ostraca ; whorls 4, sloping spirally and regularly punctately lirate 

 (lirae somewhat distant), carinate above, lines of growth close 

 and very fine ; spire exsert, acute ; aperture elliptic ; peristome 

 sharp, very thin ; lip not reflected but twisted, exactly defined 

 and anteriorly produced. 



This shell difiers from the preceding in its narrow elongate 

 form and the conspicuous keel. On some specimens a second 

 faint keel above may be noticed. When the shell is covered with 

 periostraca the keel becomes a line of somewhat indistinct 

 granules. This coupled with the faint indistinct dotted line 

 makes me think that the shell in its perfect state or in its young- 

 state is covered with a horny periostraca, which has regular lines 

 of spines or hairs at intervals. It would then resemble some of 

 the Victorian and Tasmanian species, except that none of the 

 hirsute kinds are so small as this shell, nor have they any keel. 

 With these exceptions, the present shell comes nearest to Phijsa 

 Brunonensis, Sow., of any Australian congener, and the nearest in 

 New Zealand is P. w.cEsta, H. Adams, which is angled above but 

 longer and more inflated. 



The following is a list of all the N.Z. Physoe known to me. 

 P. tabulata, Gray, P. gihhosa, Gould, P. variabilis, Gray, P. 

 Novoe Zelandice, Gray, P. mcesta, H. Adams, P. antipodea, Sow., 

 P. gicyoiiensis and P. lirata, Nobis. 



EXPLANATION OF FIGURES. 



Plate 13. 



Fig. 2. Bythinella corolla, Gould ; much enlarged. 

 Fig. 3. Variety a, much enlarged. 

 Fig. 5. Variety b, ditto. 

 Fig. 4. Physa guyonensis. 

 Fig. 6. Physa lirata. 



