456 Descinptions of Land Shells 



VITRINA PRiESTANS. 



Plate XXIV. Fig 2. 



Testa depressa, fragili, nitid&, straminea; anfr. tribus, striis incrementi et striis 

 volventibus reticulatis ; aperlura sub-coarctala. 



D 



ESCRIPTION. 



This shell has the usual ear-shaped form of other species 

 of the genus. It is principally remarkable for its great size, 

 being, perhaps, the largest species known. There are about 

 three whorls, not rising into a spire, distinguished by a delicate 

 suture, which has an adjacent impressed line. The surface is 

 delicately marked by the lines of growth, and these are crossed 

 by shallow, somewhat scattered, revolving furrows. The ap- 

 erture is nearly circular, rather wider than high ; the lip is 

 very delicate, generally inflected near its posterior junction, 

 and the final additions to the shell are such as to cause the 

 outlet to be somewhat contracted, or pursed in. The color 

 is dark straw-color, or amber-color, inclining to green. A 

 thin layer of enamel unites the two extremities of the lip. 



Greatest length | of an inch ; heighth | of an inch. 



HELIX (Streptaxis) PETITII. 



Plate XXIV. Fig 7. 



Testa oblique ovato-subglobosa, albido-virescente, arcte umbilicata ; spira atifr. 7, 

 convexiusculis, apice obtusa, supra striata, subtus Ifevigata; apertura subquad- 

 rata, antice rotundata ; columella dente lamelloso instructa ; peristomatc albo, undu- 

 lato, reflexo, ad anguluni posticum attenuate. 



Description. 



Shell obliquely ovate-globose, of a greenish white color, 

 having a moderate, regular umbilicus ; spire obtuse, of seven 

 whorls, which, on the superior aspect, exhibit distinct and 

 regular lines of growth ; beneath, polished about the umbi- 

 licus ; aperture semi-elliptical, rather large, having a single 

 compressed tooth on the transverse portion, nearest to, and 

 partially joining, the external lip ; lip white, reflexed, and 

 recurved, the external portion salient near the middle, and 

 rapidly narrowed posteriorly. 



Length f of an inch ; breadth less than i^a of an inch. 



