HELIX.— Plate CCIX. 



Species 1483. (Coll. D'Orbigny in Mus. Brit.) 



Helix omalomobpha. Uel. tettd lat'unme pertpectivi 

 innbilicatd, depreiso-orbiculari, subducoided, lav'ujatd, 

 diapliaiidyfulro-britniied; sjiird tuboblund ; anfracl'dius 

 teplem, coucexU ; aperturi lunato-ovali, tubiitjlaid, 

 labro tenui, margiiiibus approximate. 



The flat Helix. Shell very broadly pcrspectively um- 

 bilicnted, depressly orbicular, subdiscoid, smooth, di- 

 npbauous, fulvous-browu ; spire rather obtuse ; whorls 

 seven, convex; aperture lunar-oval, rather inflated, 

 lip thin, with the margins approximating. 



D'Okbic.ny, Voy. dans I'Amt'r. Mt'rid. p. -249. pi. 27. f. 

 1 to 3. 



flab. Capinata, Bolirian Andes. 



A fine cyclostomoid species, witli a very broad shallow 

 open umbilicus, of transparent horny texture, covered with 

 a thin layer of epidermis. 



Species 1484. (Coll. D'Orbigny in Mus. Brit.) 



Helix ixsignis. Uel. testd mediocriter vmbilicatd, or- 

 biculari, mibdlncoided, leniii, diaplwtid, l<Bvigald, hrun- 

 neu-Jlaticante ; spird obliisd ; anfractibtm qualuor, ro- 

 tiindalis ; apertvrd rotundato-lunari, labro ten id, ad 

 columellam breviler re/lexo. 



The EEMAitKABLE Helix. Shell moderately umbili- 

 catcd, orbicular, subdiscoid, thin, diajjbanous, smooth, 

 brownish-yellow ; spire obtuse ; whorls four, rounded ; 

 aperture rotundately lunar, lip thin, shortly reflected 

 next the columella. 



D'Orbigny, Voy. dans I'Amer. Merid. p. 247. pi. it!, f. 

 14 to 17. 



I/ab. Guayaquil. 



There is nothing in this species to suggest the idea of 

 its name. It is of a dull horny texture, and of simple 



rather flattened growth. 



.Species 1485. (Coll. D'Orbigny in Mus. Brit.) 



Helix POLLODONTA. Hel. IttlS laiiuimi aperti am- 

 bilicald, orbicular!, deprettimmd, ilriatd, albida ; 

 spird pland ; anfractibus tepletn, anffulato-rolunJa- 

 iii ; apertiird pared, eirculari, deniibiu plurimut in- 

 teniis, labro iiicroMato, re/lexo, margiHibu4 contiuHi*. 



The many-toothed Helix. Shell very broadly o|)cnly 

 umbilicated, orbicular, very depressed, striated, whi- 

 tish ; spire flat ; whorls seven, angidarly rounded , 

 aperture small, circular, furnished with several small 

 intcnial teeth, lip thickened, reflected, with the mar- 

 gins continuous. 



D'Orbigny, Voy. dons rAmer. Mi'rid. p. 237. pi. 23. f. 

 9 to 13. 



llab. Santa Cruz, Bolina. 



A peculiarly openly convoluted species, hanng the um- 

 bilicus very broadly excavated and shallow, densely finely 

 rib-striated with fine keel-like lamelhc within the aperture. 



Species 1486. (Coll. D'Orbigny in Mus. Brit.) 



Heli.\ Argonactcla. Uel. tettd subampliter profundi 

 umbilicatd, orbiculari-depressa, rugoso-»triatd, albida, 

 interdum obscure fusco-fawiatd ; spird late planatd ; 

 aiifractiiiis qualuor, supra concato-planalls, deittde 

 acute carinatis, infra cariiiam angulalo-convexix ; aper- 

 lurd conipresse trigond, lahro siiitplici. 



Tue little Argonaut Helix. Shell rather largely 

 deeply umbilicated, orbicularly depressed, roughly 

 striated, whitish, sometimes obscurely brown-banded ; 

 spire broadly flattened ; whorls four, concavely flat- 

 tened above, then sharply keeled, angularly convex 

 beneath ; aperture compressly triangular, lip simple. 



Webb and Bertiielot, D'Orbigny, Moll, des Isles Ca- 

 naries, p. 04. pi. 2. f. 13 to IS. 



Uab. Canary Islands. 



Of a peculiar flatly compressed form, but angularly con- 

 vex beueath. 



