HELIX-RHAGADA. 189 



and descends abruptly and deeply in front. Aperture very oblique 

 nearly circular, but a little wider than high, white within ; peri- 

 stome expanded all around and arched in every part, dilated on the 

 columellar margin, and reflexed nearly over the umbilicus. Parie- 

 tal wall with a light callus. 



Alt. 10J, greater diam. 14, lesser Hi mill. ; alt. of aperture 8, 

 breadth 9? mill. (meas. outside perist.) 



Shark Bay and Swan River, W. Australia. 



H. plectilis BENS., Ann. & Mag. N. H. 2nd ser., xi, p. 29. PFR. 

 Mon. Hel. Viv. iv, p. 250. REEVE, Conch. Icon. f. 1162. JET. pal- 

 eata REEVE, Conch. Icon. f. 1399. H. (Dorcasia) plectilis Sens., 

 TRYON, Manual of Conchol., 2nd ser. iii, p. 215, t. 49, f. 18, 17. 



The rude wrinkling of this compact little Helix is very character- 

 istic. In sculpture this species forms a passage to the South Aus- 

 tralian group of H. silveri. 



The strongly sculptured typical form is figured in Vol. Ill of the 

 MANUAL, pi. 49, fig. 18 ; H. paleata of Reeve is figured on the same 

 plate, fig. 17. 



H. CARCHARIAS Pfeifler. Unfigured. 



Shell covered perforate, conoid-globose, rather solid, seen under a 

 lens to be most minutely granulated, flesh colored ; spire conoidal, the 

 apex smooth, rather obtuse ; whorls 5, a little convex, the upper ones 

 irregularly tuberculate-plicate, the last one ventricose, above more 

 lightly plicate, beneath radiately striate, whitish, very deeply de- 

 scending in front. Aperture diagonal, subcircular ; peristome simple, 

 thin, narrowly expanded, the margins approximating, columellar 

 margin broadly reflexed in a vaulted manner above the umbilicus. 

 (P/r.) Alt. 10J-14, greater diam. 17-191, lesser 131-16 mill. 



Shark's Bay, Western Australia. 



H. carcharias PFR. P. Z. S. 1863, p. 528 ; Monographia Hel. Viv. 

 v, p. 322. Cox, Monogr. Austr. L. Sh., p. 45. 



Closely allied to H. plectilis Bens., but the sculpture is less rude, 

 and the last whorl inflated. 



H. TORULUS Ferussac. 



This species, if really Australian, is probably a Rhagada. See 

 this MANUAL vol. iii, p. 215, also Cox, Monograph of Australian 

 Land Shells, p. 42. FERUSSAC, Histoire, pi. 27, figs. 3, 4, and 

 PFEIFFER, Monographia i, p. 238. 



