116 Remarks on Certain Species of N. A. Uelicidm. 



5 convexiusculis, ultimo ad aperturani breviter deflexo, disjuncto, scro- 

 bicnlato-constricto ; apertura pcrobliqua, subreniformi, coarctata ; perist. 

 acuto, continue, marginibus lamella superne excavata, dentem lingui- 

 formem emittente, junctis; dcxtro lamella lata uncata, basali dente 

 lamclliformi, erecto, intra aperturam producto et recurvato, instructo. 



Shell perforate, above slightly convex, beneath convex, 

 striated, reddish-horn colored, thin, with very short hairs ; spire 

 scarcely elevated ; whorls 5, rather convex, the last deflected 

 and turned outwards from tlie preceding one, scrobiculate, 

 constricted, grooved within the umbilical region ; aperture very 

 oblique, subreniform, contracted ; peristome acute, continuous, 

 the margins joined by a lamella, excavated above, and pro- 

 duced into a tongue-shaped tooth ; the right margin liaving a 

 broad hooked lamella, and the base an erect lamelliform tooth 

 produced into and recurved within the aperture. ^ 



Diam. maj. 9, min. 8, Alt. 4, mill. 



" " 7 " 6 " 3 " var. minor. 



Hahitat, — Sullivan's Island, South Carolina. Dr. E. Ravenel ! 



Observations. — This species is certainly distinct from the 

 others of the group. In the form of the parietal process, it is 

 intermediate between H. Postelliana and H. avara, but most 

 like the latter; the teeth on the peristome are very similar to 

 those in the former, but beneath it is less inflated, the umbi- 

 lical region is wider, showing more of the penultimate whorl, 

 and it is hirsute. 



I am indebted, for this species to Dr. Edmund Ravenel, and 

 adopt the name suggested by him in correspondence with Say. 

 He informs me that many years ago he collected specimens, 

 and thinking the shell nndescribed, forwarded some to Say, 

 with the following label, which is still in Jiis possession, " H. 

 avara Say ? probably new, if so call it H. espiloca." Say con- 

 sidered them to be avaraJ^ 



* See Extracts from Dr. Ravenel's letters at page 124. I am indebted to Mrs. 



Say for specimens of JI. Postelliana, with label " Helix ? Swamps of S. Car." 



■written by Dr. Kavenel, with the specific name " avara S " added by Say. 



