1871.] F. Stoliczka — JYotes on Terrestrial Mollusca. 257 



the peristome of the normal shell had been entirely absorbed, and 

 then the growth proceeded as usually ; in such a case it would be 

 much more difficult, and sometimes quite impossible, to trace the 

 connection of the two forms, which could then with more propriety 

 be acknowledged as two distinct species. 



When after hibernation the calcareous covering or false opercu- 

 lum of the aperture has not been perfectly dissolved, the inner 

 peristome becomes sometimes irregularly thickened, as if it had 

 been injured, (fig. 9 of pi xix,) and then imperfectly restored. 



The animal is whitish or pale fleshy gray, slightly darker on 

 the head, and on the pedicles and tentacles ; mantle white in young, 

 grey near the edge in older, specimens ; posterior end of foot often 

 tinged gray. 



Hah. The species is very common on the limestone hills to the 

 east and south of Moulmein. 



SOPHINA FORABILIS, BeUS., pi. xix, fig. 10. 



Ann. Mag. Nat. Hist., 3rd ser. vol. iii, p. 389 j — eadem, Pfeiffer, Mon, Hel., 

 vol. v, p. 112. 



Soph, testa depressiuscule semiglobosa, parva, tenui, cornea, 

 nitida; anfractibus 5 — 5 J, convexiusculis, sutura adpressa, vix 

 canaliculata, junctis, striis incrementi filiformibus confertissimis et 

 in anf. superioribus striis spiralibus, aut subtilissimis aut fere 

 omnino obsoletis, tectis ; ult. anf. ad ambitum rotundato, ad basin 

 leviter convexiusculo, perforate; umbilico latiusculo 0*16 partem 

 long. diam. maj. sequante, carina distincta, albida circumdato, 

 ejusque lateribus interioribus verticaliter descenclentibus ; apertura 

 rotundate semilunari, labio albido, tenuissimo, breviter ex23anso ; 

 columella prolongata, paulo incrassata, recta, fere verticali seu paulo 

 obliqua, ad basin breviter reflexa ; labro tenui, fere recto, supra 

 vix flexuoso et paululum producto, infra leviter convexo et cum 

 columella angulum circa 115° form ante ; emarginatione carinse 

 umbilicalis brevi. Speciminis max. diam. maj. 8*8 mm. ; min. 7*5 ; 

 axis 5 ; alt., 5-8; alt. apert. 3-8 ; lat. ap. 4 mm. 



This species may be regarded as the diminutive of the variety 

 Soph. schistostelis > but it is readily distinguished from it by its less 

 convex base and comparatively large umbilicus ; it never seems to 



33 



