North American Ilelicidce. 351 



but especially the penult whorl ; aperture oblique, crescentic, 

 with erect, oblique, white parietal lamelliform tooth, joined to 

 the upper angle of the aperture by a slightly arcuate, filiform 

 callus; peristome reflexed, with margins approaching, and 

 having two dentiform lobes separated by a deep fissure. 



Diam. maj. 5£, min. 4£, alt. 2£. 



Habitat. — Near Darien, Georgia, For the specimens in my 

 cabinet I am indebted to Dr. S. W. Wilson. As to the station 

 of the species, I copy the following from one of his interesting 

 letters : 



" The place has an eastern exposure to the sea, high tides 

 rising to the base of the low bluff where they exist. The 

 growth of trees, which consists mostly of live oak and Celtis 

 occidentalism has never been cleared off; the Palmetto serrulata 

 flourishes as an undergrowth. The soil is covered for a few 

 inches in depth with oyster shells thrown there by the Indians, 

 and decayed leaves and fragments of branches are of course 

 over all these, under which, and among the superficial oyster 

 shells, the Helices live. H. pustula is nowhere near, or at least 

 a rigid search did not reveal any. H. concava (dead) occurs in 

 small numbers. H. inflecta abundantly." 



I have one dead specimen from Alabama, sent to me by Mr. 

 Anthony. 



Observations. — In my notes on H. pustula Fer. I have 

 referred to Dr. Binney's description of the shell now under 

 consideration. IT. pustuloides is intermediate in size between 

 IT. pustula and H. leporina — is less globose than the former, 

 and more sparingly hirsute. It differs widely from both in the 

 character of the umbilicus — the aperture is much like that of 

 pustida, but more narrow than that of leporina. The inferior 

 tooth on the peristome is more developed laterally than in H. 

 pustula — indeed it has a somewhat bifid appearance, in which 

 respect it is more allied to H. leporina, 



SEPTEMBER, 1858. 25 Akn> Lva Nat - Hkt - Vor " VI « 



