HELIX. 



Plate CXX. 



Species 705. (Mus. Cuming.) 



Helix microdonta. Hel. testa umbilicatd, orhiculato- 

 planu, corned vel pallide mfescente, mpenie plana, ob- 

 lique et arguti Hriatd, subtus convexd, tenerrimi striata, 

 nitidd, macidis opacis radiantibm notatd ; umbilico in- 

 fundibulifomd, excavatd; anfradibus sex, idlimo ad 

 aperluram ijibbo ; aperturd subtriangulari ; peristomate 

 subincrassalo, re/lexiusculo, marginibus deiite parvo cal- 

 loso triant/ulari jttnctis. 



The small-tootu Helix. Shell umbilicated, orbicu- 

 larly flattened, horny or pale red, flat at the upper 

 ])art, obliquely and smartly striated, convex beneath, 

 very finely striated, shining, marked with opake ra- 

 diating spots ; umbilicus funnel-shaped, hollowed ; 

 whorls six, the last gibbous at the aperture ; aperture 

 somewhat triangular ; lip rather thickened and a little 

 reflected, margins joined by a small callous triangular 

 tooth. 



Desuayes, in Ferussac, Hist. Moll. p. 6. pi. 72. f. 13. 

 Helix plana, Dunker. 



Hab. Texas and Bermuda Islands. 



Distinguislied by the small tooth which is set in a tri- 

 angular form on the bodv-whorl. 



Species 706. (ilus. Cuming.) 



Helix Teoostiana. Hel. testa umbilicatd, discoided, 

 utrinque costulatd, corned, siiperne planulatd, basi con- 

 vexiore ; spird planiusculd ; anfractibus quinque ad 

 sex, planulatis, penultimo siiblus umiilicum latum pla- 

 nulatum fonnanle, ultimo antice defiexo, constricto ; 

 aperturd obliqud, Itinari, coarctatd ; peristomate arulo, 

 angulatim refiexo, inlus calloso, marginibus callo den- 

 teni linguiformem subtrinngularem emitlente junctis, ba- 

 sali dente submarginali, dextro deiite latiore pro/undo, 

 munitis. 



Troost's Helix. Shell umbilicatcd, discoid, fiuely ribbed 

 on both sides, horny, flattened at the upper part, 

 convex at the base ; spire rather flat ; whorls five to 

 SL\, flattened, penultimate whorl forming underneath 

 a broad flattened umbilicus, last whorl deflected and 

 constricted in front ; aperture oblique, lunar, con- 

 tracted ; lip sharp, angularly reflected, callous within, 

 margins joined by a callosity emitting a subtriangular 



tongue-shaped tooth, basal tooth submarginal, right 

 margin furnished with a deep broader tooth. 



Pohjgyra Troosliana, Lea, Obscr^'ations, vol. ii. p. 17". 

 pi. 21. f. iiy. 



Hab. Tencssee, North America. 



The tongue-shaped tooth upon the body-wborl of thi» 

 species is unusually broad and excavated. 



Species 707. (Mus. Cuming.) 



Helix Texasiana. Hel. testa umbilicatd, orbiculato-de- 

 pressd, teniiiuxculd, nitiduld, albd vel riiMld, fiipenir 

 confertim plicatd, basi contexd, lavigatd ; spirn brr- 

 vissimd, vix elevatd ; anfractibus sex, planulatis, ultimo 

 prope aperluram argute plicato, antici deflexo, sniint 

 constricto, basi deciaute, rimam arcuotam fonnanle . 

 aperturd liinari, coarctatd ; peristomate albo, reftezo, 

 marginibus dente Unguiformi acuta triangulari juneti^, 

 dextro dente miuuto, basati dente validiorc, muniti*. 



The Texas Helix. Shell uml)ilicated, orbicularly de- 

 pressed, rather tliin, shining, whitish or reddish, 

 closely plicated at the upper part, convex and smooth 

 at the base ; spire very short, scarcely raised ; whorls 

 six, flattened, the last neatly plicated near the apt-r- 

 ture, deflected in front, constricted beneath, de\'iating 

 at the base so as to form an arched rim ; aperture 

 lunar, contracted; lip white, reflected, margins joined 

 by a sharp triangular tongue-shaped tooth, right 

 margin furnished with a minute tooth, basal with a 

 stronger one. 



MoRic^ND, .Mem. Soc. Hist. Nat. Geneva, vol. vi. p. 53S. 

 pi. 1. f 2. 



Hab. Texas, Alabama. 



The tooth on the body-whorl forms n distinct hollowed 

 triangle joining with the margins of the aperture 



Species 708. (.Mus. Cuming.) 



Helix Berlandebiana. Hel. testa angusti umbilicatd, 

 depresxo-globosd, striatd. luridd, aVta ret rinerrS, in- 

 terdum unifascuitd ; anfraclibus quntuor ad quinque. 

 contexiusculis, ultimo basi iuflalo ; aperturd Imualo- 

 Kubcirrulari ; peristomal^ arulo, iutua ' ' ■ rgiue 



columellari juxin uiiibiliruin loigutlum / 'itlo. 



Berlander s Helix. Shell narrowly umbdicntc<l, d«- 



August, 1852. 



