230 REV. H. B. TRISTRAM ON GUATEMALAN MOLLUSKS. [May 28, 



iu Mexican collections, the greater portion of those hitherto described 

 have been observed only in Guatemala by M. Moricand and others. 

 With the exception of one or two, as Achatina ocfona, of universal 

 occurrence iu the warmer regions of the New World, none are iden- 

 tical with West Indian species, and the new species show close generic 

 affinities with the shells of the northern regions of South America. 



1. Helix ghiesbreghti, Nyst. 



The largest and most magnificent species of Helix in the New 

 World, and rivalling in size the Helix ituderii of Madagascar. 



2. Helix eximia, Pfr. 



3. Helix lalliana, Pfr., var. 



4. Helix euryomphala, Pfr. 



Closely allied to Helix laxata of South America. 



5. Helix coactiliata, Fer. 



6. BuLiMUS PAziANXJS, D'Orb. 



7. BULIMUS MORICANDl, Pfr. 



8. BULIMUS HONDURATIANUS, Pfr. 



9. BULIMUS DYSONI, Pfr. 



10. BuLiMus SEMiPELLUciDUs, nov. spec. (PI. XXVI. fig. 8.) 

 Allied to B. discrepans, Sowerby. 



T. imperforata, oblonf/o-conica, fragilis, nitida, semipellucida, alba, 

 strigis opacis sparse signata ; spira conica, acuta ; sutura pro- 

 funda ; anfract. 6, convexi, ultimvs spirani paulo superans, infla- 

 tus, basi rotundatus ; columella verticalis, stricta ; apertura vix 

 obliqua, angulato-ovalis ; peristoma tenue, margine dextro minime 

 expanse, margine columellari breviter rejlexo. 



Long. 18, diam. 8 mill. 



11. SucciNEA puTRis (?), Linn. 



12. GlANDINA GHIESBREGHTI, Pff. 



13. Glandina carminensis, Morelet. 

 Described by Morelet from Costa Rica. 



14. Achatina (species doubtful). 



15. Achatina octona. Lam. 



16. Spiraxis lattrei, Pfr. 



17. Spiraxis shuttleworthii, Pfr. 



