272 DR. L. PFEIFFER ON NEW LAND SHELLS. [NoV. 25, 



cii'ca umhiliciun angustum infundibuU instar excavatus ; apev' 

 tura obliqiia, lunaris, intus alba, subfasciata ; j^erist. simpleoc, 

 marginibus convergentibus, callo junctis, dextro ab insertions 

 asce.ndente, regidariter arcuato, expanso, columellari Jlexuoso, 

 anguste reflexo. 



Diam. maj. 30, min. 25, alt. 12 mill. 



i?"a5. Island of Mysol(?Fc^/«ee). 



Nearly allied to //. circumdata, Fer., from which it differs in its 

 size and epidermis, in its last whorl being less deflected, the umbilicus 

 narrower, and the aperture more rounded. 



15. Helix biomphala, Pfr. (1888 a). T. mediocriter umhili- 

 cata, depressa, solidida, striatula et lanugine brevi obtecta, 



fusca ; spira profunde immersa ; anfr. fere 5, tiirgidi, ultimi 

 rapide accrescentes, ultimus injlatus, alius, antice sensim de- 

 scendens, circa umbilicum non angulatus ; aperttira fere dia- 

 gonalis, lunari-rotundata, intus margaritacea ; pei'ist. tenue, 

 carneum, marginibus convergentibus, dextro ab insertions ascen- 

 dente, subregulariter arcuato, anguste expanso, columellari sub- 

 arcuato-declivi, anguste refiexo. 



Diam. maj. 20, min. 17, alt. 10-11 mill. 



Hab. Island of Ceram (7FaZ^«ce). 



16. Helix laomontana, Pfr. (1911 a). (PI. XXXVI. figs, 9, 

 10.) T. umbilicata, discoidea, solida, conferte capillaceo- 

 striata, fusca ; spira plana ; anfr. Q)^,vix convexiuscidi, lente 

 accrescentes, ultimus periplieria rotundatus, antice subdilatatus, 

 deflexus, suhtus antice fortius striatus ; umbilicus latissimus, 

 pateriformis ; apertura perobliqua, transverse truncato-oblonga, 

 in imo fundo lamellis pluribus, per testam pellucentibus, munita; 

 perist. albidum, incrassatum et refexiusculum, marginibus callo 

 crassiusculo rectilineari junctis. 



Diam. maj. 32, min. 27, alt. 8|- mill. 



jS. Minor, anfr. 6, lamellis in anfr. ultimo nullis conspicuis. An 



spec, propria? 

 Diam. maj. 21^-, min. 18, alt. 6^ mill. 

 Hab. Lao Mountains, Camboja {Mouhot). 



17. Helix horrida, Pfr. (1912 «). (PI. XXXVI. fig. 15.) 

 T. umbilicata, depressa, tenuiuscula, granulata setisque rigidis 

 erectis obsita, corneo-fusca ; spira immersa ; sutura profunda ; 

 anfr. 4^, convexi, tdtimus rotundatus, antice profmide descen- 

 dens, fossa profunda ab apertura remotiuscula et 2 juxta peri- 

 stoma notatus ; umbilicus latiusculus, infundibuliformis; aper- 

 tura subhorizontalis, bisinuato-pyriformis, intus dente "profundo 

 et ad marginem duobus validis {omnibus fossis externis respon- 

 dentibus) instructa ; perist. continuum, undique refiexum, mar- 

 ginibus dextro et basali flexuosis, parietali subelevato, 



Diam. maj. 18|-, min. 14, alt. 7^ mill. 

 Hab. Lao Mountains, Camboja (Motihot). 



