HELIX.— Plate CXVIII. 



five, convex, obliquely plicately striated, impressly 

 decussated with minute spiral lines ; a[)t,'rtur<^ nearly 

 circular ; lip thin, margins approximating, coluniellar 

 margin shortly dilated. 



Pfeiffek, Pro. Zool. Soc. 1852. 



HaL. Shanghai, China ; Fortune. 



Of a subacuminated BuUmm-Yikt growth, thin and semi- 

 transparent, and of a uniform light flesh-brown hue. 



Species 689. (Mus. Cuming.) 



Helix appressa. Ilel. testa obtecie umbilicald, orbicu- 

 laio-depressd, pellucidd, costulato-striatd, comeo-lutes- 

 cente ; spird planulfitd ; aiifractibus tiuinqiie, superne 

 planulalis, itUii/io obtuse angulalo (amjido aut'ux eca- 

 iiescenle), antici comtricio ; aperturd coarctaid, siib- 

 trimtffitlari ; peristomate amjulatim late rejlexo, intM 

 calloso, marginibus callo leiiiii, dentem Imguifornwm 

 oblique inlrantem emUtente, junctis, dextro el basali 

 slrictiusculo obsolete dentatis. 



The appressed Helix. Shell with a covered umbilicus, 

 orbicularly depressed, pellucid, finely rib-like striated, 

 honiy-vellow ; spire flattened ; whorls five, flattened 

 at the u])|)er part, the last obtusely angled (the angle 

 disappearing towards the front) constricted anteriorly; 

 aperture contracted, nearly triangular ; lip angularly 

 broadly reflected, callous within, margins joined by a 

 thin callosity, emitting an obliquely entering tongue- 

 shaped tooth, right and basal margins rather drawn 

 out, obsoletely toothed. 



Sat, Journ. Acad. Nat. Sci. Philadelphia, vol. ii. p. 1.51. 

 Helix linguifera, Ferussac. 



Hub. Ohio and Missouri, North America. 



Characterized in great measure by its appressly flattened 

 growth. 



Species 690. (Mus. Cuming.) 



Helix tridentata. Eel. testd umiilicatd, orbiciMo- 

 (Ispressd, conferlim costulato-striatd, corneo-luted vet 

 fuscescente ; spird breviisimd ; aiifractibus i/uinque ad 

 nex, convexiusculis, ulliiiio aiitice vij; descendente ; aper- 

 turd luiiari, sublriangulari ; perlitomate rejlexo, alio, 

 iiitus calloso, marginWus coimiveiilibus, callo lenui 

 deiiteni liiiffulformei/i intrantem emitleiile junctis, dex- 

 tro el basati unideutalis, denlibus iiuequalibus, in ipso 

 iiiaryine calli posilis. 



The xnitEE-TooTHED Helix. Shell urabilicated, orbi- 

 cularly depressed, closely rib-like striated, horny- 

 yellow or brownish ; spire very short ; whorls Ave to 



six, rather convex, the last a little descending in 

 front ; aperture lunar, subtriangidar ; lip reflected, 

 white, callous within, margins a];proximating, joined 

 by a thin callosity, emitting an entering tongue- 

 shaped tooth, right and basal margins one-toothed, 

 teeth unequal, placed on thr callous edge. 



Say, Niehol's Encyclopaedia (American edition), vol. iv. 



Jfa/j. Atlantic States of North America. 



Although resembling //. /a///ur in the dentition of the 

 aperture, the shell is specifically distinct in form and man- 

 ner of convolution. 



Species 691. (Mus. Cuming.) 



Helix multilineata. Ilel. testd obtecie umbilicatd, de- 

 presso-f/lobosd, lenui, pellucida, cotlulis miniUit o6li- 

 qiiis confertissimis ornatd, coriieo-stramined, cingulis 

 cariis niigustis riijis circuiiidatd ; aiifractibus sex, con- 

 vexiusculis; aperturd lunaio-rotundata ; peristomate 

 acuta, angulatim reflexn, iiuirgiiie culuuiellari in lami- 

 nam tenueni, uiMlicum prorsus obtegentem, expanso. 



The many-lined Helix. Shell with a covered umbili- 

 cus, depressly globose, thin, pellucid, ornamented 

 with oblique close-set iniimte ribs, homy-straw co- 

 lour, encircled with various narrow red bands and 

 lines ; whorls six, rather convex ; aperture lunar- 

 rounded ; lip sharp, angularly reflected, columellar 

 margin expanded into a thin lamella, entirely cover- 

 ing the umbilicus. 



Say, Jouni. Acad. Nat. Sci. Philadelphia, vol. ii. p. 150. 



Hub. Illinois and ilissouri. North America. 



This delicate tinely-ribbed transparent species, encircled 

 with red bands and lines, stands alone as a distinct tyjw 

 by itself among the North jVmerican snails. 



Species 692. (Mus. Cumiug.) 



Helix Columbiana. Net. testa umbilicald, globo*o-de- 

 pressd, lenui, luteo-corned, slriatd, pilis breribus ri- 

 gidis obsitd ; spird elecatiiisciild : aiifractibus sex, coh- 

 vexis, ultimo antici vix dejlexo, ad aperluram coii- 

 slricto ; aperturd rotuiidato-lunari : peristomate late 

 expanso, inliis albo, calloso, margine columellari bred, 

 nubcerticali, dUalalo, rejlexo, umiiliaim angustum fere 

 orcultante, basnli slrictiuwiilo. 



The Columbia Helix. Shell umbilicated, globosely 

 depressed, thin, yellowish-honiy, striated, covered 

 with short rigid hairs : sjiire sonicwhat niised ; 

 whorls six, convex, the last a little deflected in front, 

 constricted at the aperture ; aperture rotuudateh 



