HELIX.— Plate CVIII. 



Species 607. (Mus. Cumiug.) 



Helix Swainsoni. IM. tedd umbilicatd, depressmimd, 

 tetitii, pellucidd, subarcualim rugidoso-slriatd, viret- 

 cenle-fidvd, liiiein riijk ornatd ; anfractibm quinque, 

 flepreuis, medio conoexiusculis, cariiialU, carina acuta ; 

 itmliUico tnediocri, pro/undo ; aperttird perol/liqud, de- 

 presse securiformi ; periatomate simplici, recto, mar- 

 ijine columellari mibincrassalo. 



SwAiNsox's Helix. Shell umbilicated, very depressed 

 on both sides, thin, pellucid, somewhat arcuately 

 roui^hly striated, fjrecnish-yellow, ornamented with 

 two red lines; whorls five, depressed, rather coavex 

 in the middle, keeled, keel sharp ; umbilicus middling, 

 deep ; aperture very deep, depressly hatchet-shaped ; 

 lip simple, straight, columcUar margin rather thick- 

 ened. 



I'FEIFFEU, Pro. Zool. Soc. 18-16, p. 28. 



Ho/>. Tahiti. 



Very closely allied to H. ZolUngeri figured above it. Of 

 the two red lines mentioned in the description, one is 

 above the keel and the other below it, but they are not 

 always present, and the shell is sometimes partially co- 

 vered with a light freckled epidermis. 



Species 608. (Pig. a, b, Mus. Cuming.) 

 Hklix Emiliana. Hel. testa minute umbilicaid, depreaso- 



orbiculari, oUvaceo-comeS, bati contexd, Urvi, tumiduld, 

 auperni creberrime costiilalo-ttriatd, ttriit pectiliariter 

 tjranulatis ; spird apicem ttraua eleva/d ; nnfractibut 

 »ez, eonvexit, ultimo acute carinalo ; aperlurd fraut- 

 verae ovatd, labro simplici. 



Emil's Helix. ShcU minutely umbilicated, depressly 

 orbicular, olive-homy, convex at the base, smooth 

 aud rather swollen, very closely rib-like striated at 

 tlie upper part, ribs peculiarly granulcd ; spire raised 

 towards the apex ; whorls six, convex, the last shaqily 

 keeled ; aperture transversely ovate, lip simple. 



Pfeiffek, Pro. Zool. Soc. 1851. 



Hab. Ceylon ; Layard. 



.\ thin horny shell, characterized by a verj' remarkable 

 fine grain-ribbed sculpture on the upper surface, wliile all 

 below the keel is smooth aud polished. 



Fig. 609. (Mus. Cuming.) 



The shell here figured appears to be identical with 11. 

 Swainsoni figured above it, and both answer to the //. Eu- 

 rydice described in the same year by Dr. Goidd, among 

 the new shells collected by the United States Exploring 

 Expedition. H. ZolUngeri may prove to be only another 

 varietv of the same. 



