HELIX. 



Plate CXII. 



Species C36. (Mus. Cuming.) 



Helix Siiuttleworthi. Ilel. testa utrinque umbiUcatd, 

 auljcompresad, corned, pellucidd ; npird immersd ; an- 

 fradiliM quutitor ad qidnqiie, rolundatk, incoliitis, 

 heciiiis, niik/U; aperlurd anymtd, compresso-lunari, 

 labro simplici, acuta. 



SuUTTLEWORTii's ITelix. Shell umbilicated on both 

 sides, rather compressed, homy, transparent ; spire 

 immersed ; whorls four to five, rounded, involuted, 

 smooth, shining; aperture narrow, compressly lunar, 

 lip simple, sharp. 



Pfeiffeb, Zeitschrift fur Malac. 1S.")1. p. It. 



Hab. Bahia. 



A small Nautiloid species, the whorls being convoluted 

 one into the other, so as to form an umbilicus on each side. 



Species 637. (Mus. Cuming.) 



Helix semen-lini. Ilel. iesld umbiUcatd, suhconicd, 

 leniii, corned, pellucidd; spird breti ; anfraclibm 

 quiiique, convexis, laviiits, nitidis; aperlurd lunari- 

 ovatd, subhorizontali. 



Tue fl.\x-seed Helix. Shell umbilicated, somewhat 

 conical, thin, horny, transparent ; spire short ; whorls 

 five, convex, smooth, shining ; aperture lunar-ovate, 

 nearly horizontal. 



MoRicAND, Mem. Nat. Hist. Soc. Geneva, 3rd suppl. 

 p. 55. pi. 5. f. 17. 



Ilab. Bahia. 



A little transparent homy species, of simple and regular 

 subconical growth. 



An opakc brown shell, as if covered with nu epidermis, 

 partaking of the form of CycUisloma . 



Species 638. (Mus. Cuming.) 



Helix costellata. Hel. testa subampUter umbilicatd, 

 tenui, fused ; spird depressd ; sutitrd dislincld ; an- 

 fractiLus quinque, rotutidatis, subtilissime costellalis ; 

 aperturd rotunda, labro tenui, acuta. 



Tue riXELY-KiBUEU Helix. Shell rather largely um- 

 bilicated, thin, brown ; spire depressed ; suture dis- 

 tinct ; whorls five, rounded, very finely ribbed ; aper- 

 ture round, lip thin, sharp. 



D'OiiBiCNY, Voyage dans TAmcr. Merid. p. 252. pi. 2G. 

 f. 6-9. 



Hab. Montevideo. Eastern Paraguay. ' 



August, 



Species 639. (Mus. Cuming.) 



Helix epidekmia. Jfel. tetid lali et profundi umbilicatd, 

 dincoiJed, epidermide brunned iiulutd, utrinque costel- 

 latd; spird plana ; aiifraclibiu quatuor, sentim aceret- 

 centibus, contexiusculii ; aperturd subvert icati, subcir- 

 culari ; peri-itomale acut'j, simplici, nuiri/iniius up- 

 proximatis. 



The EPiuEiiMis-covEKED Helix. Shell l)roadly and 

 deeply umbilicated, discoiil, covered with a brown 

 epidermis, finely ril)bed on both sides ; spire flat ; 

 whorls four, increasing slowly, rather convex ; aper- 

 ture nearly vertical, subcircular; lip slmrp, simple, 

 with the margins approximating. 



Anton, Verz. p. 30. 



Helix costellata, Deshayes. 



Hub. Valparaiso ; Cuming. 



It is extremely doubtful whether this species differs 

 specifically from the preceding. 



Species 610. (Mus. Cuming.) 



Helix Pacifica. Hel. testa umbilicatd, sub-TrochiforMt . 

 tenui, pellucidd, striatuld, corned; spird eouoiiled. 

 aculiusculd; anfractibus sex ad septem, conrexiuiculit, 

 ultimo acute carinato, basi poulo conrexiore, l<erigalo, 

 nitido ; aperturd depressd, antjulato-lunari ; pfritlo- 

 mate simplici, acuta, margine columellari rit dilalalo, 

 in perforatiuneni puncliformem inurto. 

 The Pacific Helix. Shell umbilicated, somewhat Tro- 

 ehus-shapcd, thin, trnnsparenl, finely striated, horny, 

 spire conoid, nithcr sharp ; whorls six to seven, rathi i 

 convex, the last shnqily keeled, a little more convex, 

 smooth and shining at the base ; aiicrturc dcprrssoti, 

 angularly lunar ; lip simjjlc, slmrp, coluuiellnr ninr- 

 gin scarcely dilated, inserted in the punctun-liki- 

 umbilicus. 

 Pfeiffeb, Symbola;, vol. iii. p. 66. 

 Hab. Cocos Island, Pacific Ocean. 



The surface of this little horny species has n silkcu as- 

 pect above the keel, an<l a smooth iH)lished one bt-low it. 



1S52. 



