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Show • 1877.] MR. SMITH O N N E W SOUTH-AMERICAN HELICID^S. 361 Fig. 3. Outer side view of alveolar part of the left maxillary, with the series after the acquisition of the premolar in situ. PLATE XXXVIII. Sthenurus minor, Ow. Fig. 1. Eight upper premolar, outer side of crown. 2. The same tooth, the inner side of crown. 3. The same tooth, working surface of crown. 4. Eight upper m 3, wording surface of crown. Sthenurus atlas, Ow. 5. Eight upper premolar and contiguous molar, outer side of crown. 6. The same teeth, inner side of crown. 7. The same teeth, working surface of crown. 8. Eight upper, m 3, working surface of crown. 9. Eight lower premolar, outer surface of crown. 10. The same tooth with d 4, inner surface of crown. 11. Eight upper incisors, outer side view. Sthenurus brehus, Ow. 12. Eight upper premolar and contiguous molar, outer side of crown. 13. The same teeth, inner side of crown. 14. Tbe same teeth, working surface of crown. 15. The right upper m 3, working surface of crown. 16. The right lower premolar, outer side of crown. 17. The same tooth, inner side of crown. All the figures in both Plates are of the natural size. 6. Description of new Species of South-American Helicidae in the British Museum. By E D G A R A. S M I T H , F.Z.S. [Eeceived April 10, 1877.] (Plate XXXIX.) HELIX (ISOMERIA) GEALEI. (Plate XXXIX. figs. 9 a, 9 bi) Testa obtecte perforata, depresse conica, ad peripheriam acute carinata, oblique striata et granulata, supra anfr. ultimum malleata, castanea, versus apicem pallidior; spira depresse conica, apice obtuso, marginibusque vix convexiusculis; anfractus 5 parum convexi, lente accrescentes, sutura profundi-uscula sejuncti, ultimus aliquanto pone labrum contractus, ad aperturam subito deflexus, constrictus, subtus ad labrum quasi distortus, circa medium acute carinatus, versus aperturam carina plus minusve evanescente; apertura subhorizontalis, intus pallide carnea; peristoma incrassatum undique eeneo-viridi iridescens margine dextro sinuato reflexo dentem prominentem fuscum gerente, columellari lato reflexo umbilicum tegente, medio intra aperturam dente pallido minore munito, superne callo tenui prismatico labro juncto. Diam. max. 37 mill., min. 30 ; alt. 17. Hab. Malacatos, South Ecuador. I feel much pleasure in associating with this remarkable species |