133 



posterior sides with divaricating graruilose plica? united in the 

 median region by transverse rows of granules ; the whole 

 surface with regular incised lines coincident with the edge of 

 the shell. 



Interior of right valve with a bifid cardinal tooth in front of 

 a ligaroental pit, laterals one on each side stout and elongated. 



Length, "09 ; breadth, "06 inch. 



Habitat. — Shell sand Fowler's Bay, two right valves (Tate). 



The shape and sculpturing recalls some Ooniomyat, in the 

 latter character particularly of G. heteropleura, Ag., with this 

 difference that the en chevron plicae are inverted. 



DESCRIPTIONS OF NEW SPECIES OE SOUTH 

 ATJSTEALIAN "PULMONIEEEOUS SNAILS. 



Helix subsecta, nov. spec. PL v., figs. 2a, 2b. 



Shell umbilicated, depressly orbicular, nearly discoid, solid, 

 somewhat rugosely plicated, and obscurely but densely 

 longitudinally striated, more conspicuously so on the anterior 

 half of the body whorl. Colour greyish-white, somewhat 

 porcellanous ; epidermis ? Spire slightly convex, whorls 

 five ; last whorl rounded at the periphery, anteriorly much 

 depressed. Peristone thin, reflected, with an acute edge, but 

 not thickened, nearly entire ; aperture longitudinally ovate. 

 Umbilicus large ; its Jbreadth being about one-fifth the major 

 diameter of the base of the shell. 



Dimensions. — Major diameter, '625 ; minor diam., '5 ; height, 

 "25 of an inch. 



Locality. — Collected by Mrs. Kreusler, an indefatigable ento- 

 mologist, in the Port "Wakefield Scrub. 



This species stands alone among the Australian Helices in 

 its deflected aperture and almost entire peristome, associated 

 with a depressed spire and open umbilicus. 



Helix Nttllarborica, nov. spec. PI. v., figs, la, lb. 



Shell narrowly umbilicated, globosely conic, very thick, 

 surface of a dirty white colour, coarsely and closely wrinkled 

 transversely, interrupted by equidistant incised lines, whorls 

 4i, rotund, and just perceptibly flattened at the suture, which 

 is impressed. Last whorl somewhat inflated, descending but 

 little in front, base convex. Aperture oblique, sub-circular, 

 peristome sub-acute, slightly reflected, margins joined by a 

 callus ; columella margin thickly dilated above, and nearly 

 covering the umbilicus. 



Major diameter, f inch; minor diam., ^ths of an inch; 

 height, | of an inch. 



