North American HelicidcB. 41 



angulum aperturse juncto; perist. reflexo, roseo, marginibus connivcntibus, 

 dentibus diiobus sinu disjunctis instructo. 



Shell widely umbilicate, planorboid, tliin, rufous or pale 

 horn-colored, delicately striated, with thin sparingly hirsute 

 epidermis ; spire scarcely elevated ; whorls 4- 4|^, slightly con- 

 vex, gradually increasing, the last subangular at the periphery, 

 at the aperture gibbous, constricted, suddenly deilexed, beneath 

 devious ; suture rather deeply impressed ; umbilicus wide, 

 equal to one-third of the larger diam. of the shell, showing all, 

 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 

 occidentalis, has never been cleared off; t\\Q 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. II. pustula is nowhere near, or at least 

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

 small numbers. H. infleda abundantly." 



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

 Anthony. 



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



