136 HELIX-HADRA. 



H. MULGO^ Cox. PL 40, figs. 98, 99. 



Shell subglobose, perforated, with conoidal spire, obsoletely keeled 

 at the periphery ; thin, light, reddish-brown or pale greenish-yellow, 

 not banded ; obliquely, rather rudely striated, especially at the 

 sutures, microscopically granulated, smooth beneath. 



The form is slightly more globose and swollen beneath than H. 

 grayi, and it is thinner, lighter, without brown bands at suture and 

 umbilicus. The spire is low-conoidal, apex obtuse ; whorls 5 to 6, 

 convex, the last a little descending in front, swollen below, obso- 

 letely keeled at circumference. Aperture oblique, round-lunar, 

 purple inside ; peristome very slightly thickened, white, baso-colu- 

 mellar margin expanded, half closing the narrow umbilicus. 



Alt. 20, greater diam. 22, lesser 20 mill. 



Mulgoa, near Penrith, N. S. Wales, Australia. 



H. mulgoce Cox, Mon. Austr. L. Sh., p. 38, t. 1, f. 3, 7, 7a. 



Although closely allied to H. grayi, and even more near to H. 

 corneovirens, this species has certain characters peculiar to it. 



H. CORNEOVIRENS PfeifFer. PI. 40, figs. 1, 2, 3. 



Shell globose, somewhat depressed, half-covered umbilicate, the 

 periphery obsoletely keeled ; of a light greenish-yellow color, some- 

 what translucent, thin and light, rather rudely obliquely striated, 

 microscopically granulated, smooth below. 



The shell is inflated, thin and light, pale greenish horn-colored 

 or yellowish. Apex whitish, obtuse ; whorls 5 J, the last a little 

 descending in front. Aperture rounded-lunar, light purplish inside, 

 peristome simple, not expanded or thickened, white ; at the umbili- 

 cus suddenly dilated, half concealing it. 



Alt. 17 greater diam. 20 , lesser 19 mill. 



Picton, (46 miles S. W. of Sydney} N. S. Wales, Australia. 



H. corneovirens PFR., Zeitschr. f. Malak. 1851, p. 25 ; Mono- 

 graphia iii, p. 41. REEVE, Conch. Icon. f. 1366. Cox, Monogr. 

 Austr. L. Sh., p. 46. WOLL ASTON, Testacea Atlantica, p. 505. 



Formerly supposed to inhabit the Cape Verde Is. It is thinner 

 and lighter than H. mulgoce, or the other allied species. Fig. 3 is 

 typical ; I have figured a more globose specimen. 



H. L^SA Reeve. 



A species of Hadra described by Tryon under Dorcasia, MANUAL 

 iii, p. 214, t. 49, f. 15. 



