Zoological Society. 139 



thickness of unclassified strata in the Isle of Wight is 400 feet, 

 if not more, and within this range are at least two distinct sets of 

 organic remains. The fluvio-raarine beds in all, including the Headon 

 series, are very nearly 600 feet thick. 



ZOOLOGICAL SOCIETY. 



May 27, 1851.— W. Yarrell, Esq., V.P.L.S., in the Chair. 



Description of new Land Shells from the Collection 

 OF H. Cuming, Esq. By Dr. L. Pfeiffer. 



1 . Helix axjdebardi, Pfr. H. testd imperforatd, conoideo- 

 globosd, soliduld, nitidd, castaneo-fulvd, strigis saturatioribus 

 confertis ornatd ; spird conoided, apice obtusiusculd, albidd ; an- 



fractibus o\ convexis, summis granulatis, ultimis irregulariter 

 rugoso-striatis, ultimo infiato, antice deflexo ; columelld perdeclivi, 

 subarcuatd, laid, pland, albd ; aperturd perobliqud, truncato-ovali, 

 intus cteruled, nitidd ; peristomate incrassato, subreflexo, alba. 



Diam. maj. 48, min. 39, alt. 35 mill. 



Hab. St. Domingo {Salle). 



2. Helix albersiana, Pfr. H. testd umbilicatd, subturbinato- 

 depressd, tenui, acute et confertim costatd, diaphand, rufo -corned ; 

 spird subturbinatd , apice acutd ; anfractibus 4^ convexis, celeriter 

 accrescentibus, ultimo antice deflexo, basi juxta umbilicum an- 

 guste constricto ; aperturd perobliqud, lunato-ovali ; peristomate 

 tenui, marginibus subconniventibus, dextro breviter expanso, colu- 

 mellari dilatato, reflexo, intus plied obliqud, dentiformi munito. 



Diam. maj. 14^, min. 12, alt. 8^ mill. 

 Hab. St. Domingo {Salle). 



3. Helix pubescens, Pfr. H. testd angustissim^ umbilicatd, 

 depressd, tenui, pilis mollibus, brevibus, confertis pubescente, dia- 

 phand, lutescente ; spird vix convexd, obtusd ; anfractibus 5, con- 

 vexiusculis, ultimo subrotundato, altiore quam lata, non descen- 

 dente ; aperturd vix obliqud, rotundato-lunari ; peristomate sim- 

 plice, recto, margine columellari superne breviter reflexo. 



Diam. maj. 11, min. 10, alt. 6 mill. 

 Hab. St. Domingo {Salle). 



4. Helix leucorhaphe, Pfr. H. testd anguste umbilicatd, 

 depresso-turbinatd, subtilissime striatuld, diaphand, luteo-corned, 

 fascid angustd, cretaced, ad suturam ornatd ; spird subturbinatd, 

 apice obtusiusculd ; anfractibus 6 planiuscuUs, ultimo convexiore, 

 non descendente, basi subplanato ; aperturd vix obliqud, lunari ; 

 peristomate simplice, recto, margine columellari reflexiusculo . 



Diam. maj. 10, min. 9, alt. 6 mill. 

 Hab. St. Domingo {Sall^). 



5. SucciNEA dominicensis, Pfr. iS. testd ovali, soliduld, sub- 

 striatd, comeo- albidd, punclis corneis irregulariter aspersd ; spird 

 conicd, acutd; anfractibus Z\ convexis, summis corneis, ultimo 



10* 



