19 



aperture, and the transverse incisions of the strise are sufficiently- 

 distinctive. 



Helix mutata. T. orbicularis, depi-essa, tenuis, cerina, infra 

 rotundata : spira anfr. 4 convexis, nitidis, junioribus glabratis, 

 majoribus supra crassi-striatis, subangulatis ; sutura impressa : 

 subtus glabra, sulcis radiantibus remotis radiatim divisa, umbilico 

 modico perforata ; apertura ampla, lunata, basi subangulata ; 

 labro simplici. Lat. ^ alt. -£$. Hab. Rio Janeiro. 



Not unlike H. alliaria, or small specimens of H. cellaria, in 

 general aspect ; but it is more globose and coarsely rib-striate, 

 like H. Pennsylvanica. It may be H. insignis, D'Orb. 



Helix lyrata (Cotjthouy MS.). Testa minuta, depressa, 

 rufo-cornea, umbilicata : spira anfr. 4 cylindricis, et striis elevatis 

 conferlis lyratis ; sutura canaliculata. : apertura circularis ; labro 

 simplici. Lat. |, alt. ^o P o1 ^ H^- Terra del Fuego. 



About the size and color of H. rupestris, but more depressed, 

 and with a less expanded umbilicus. It may be H. costellata, 

 D'Orb. 



Helix pusilltis. Testa minuta, tenuis, depressa ; supra, ob- 

 lique striata, albido-virens ; infra viridior, sub-polita, perforata : 

 spira anfr. 4 sub-planulatis ; sutura profunda : apertura circu- 

 laris ; labro simplici. Long. ¥ 7 i lat. ^ poll. Hab. Mountains 

 of Maui, Sandwich Islands. 



Scarcely to be distinguished from H. electrina, Gould, in size 

 and form, but it is more coarsely striated. It is also like H. spi- 

 rillus, but has a much smaller umbilicus. 



Helix saxatilis (Cotjthouy MS.). Testa parva, sub-globosa, 

 lucida, viridis, infra convexa, umbilico modico perforata, leviter 

 striata : spira anfr. vix 4 cylindricis, cito crescentibus ; sutura ca- 

 naliculata : apertura sub-orbicularis, ampla ; labro simplici, fere 

 continuo. Alt. ^j, lat. J poll. Hab. Terra del Fuego. 



Resembles, in general, H. lucida, and is remarkable for its 

 globular form and fresh green color. 



Helix ex^equata. T. parva, discoidea, tenuis, lucida, gla- 

 brata, succineo-cornea, ad peripheriam rotundata, infra sub-plana, 

 in foveam centralem devexa : spira anfr. 7 arete volutis, supra 

 planulatis, sutura marginata bene impressa discretis, spiram pla- 

 nam efformantibus : apertura angusta, transversa ; labro simplici, 



