1871.] F. Stoliczka — Notes on Terrestrial Mollusca. 239 



was a thin horny shell, and probably not quite mature. Young 

 shells have the periphery always very sharply carinated, and the 

 spiral ribs or striae on the whorls, as well as on the somewhat 

 inflated base, are distinct. Specimens which live on foliage, or 

 other kind of vegetation in low land, retain the thin horny structure 

 of their shells, even when full grown, but the spiral striation.of the 

 whorls is often difficult to be traced. On drier places and on 

 sandstone hills the shells become more solid and are covered with 

 a thin horny cuticle ; the spiral striation becomes very distinctly 

 discernible, and the re often appear intermediate strise between the 

 4 or 5 stronger spiral ribs. A young specimen of this type has 

 been described by Blanford as Nanina culmen. On limestone ground 

 the shells become again more solid, often attaining a considerable 

 thickness, and the specimens also grow to a larger size, but the 

 spiral striation occasionally disappears almost entirely on the two 

 last whorls. 



The species is common about Moulmein, though not so much on 

 low land as on limestone hills. The spiral angle of specimens 

 collected in Burma varies from nearly 70° to 86 degrees. The fol- 

 lowing table will indicate some of the principal variations. 



Pegu. Moulmein. 



f ^ t a 



Number of whorls, 6 8 %\ . 6| 7 



Larger diameter, 5-8 13 7" 8" 11*2 mm. 



Shorter diameter, 52 11-5 6*4 7*2 10* „ 



Height of shell, 55 12- 7* 7'5 10- „ 



Spiral angle, 72° 80° 70° 80° 86° 



culmen, attegia. attegia. 



Conulema infula, Bens., pi. xviii, figs. 5 — 9. 



Helix infula, Benson, Ann. and Mag. N. Hist., II, p. 160, — eadem auctorum. 



The animal of this species is identical in form and coloration with 

 that of attegia, except that there is often a little more leaden grey 

 on the upper posterior part of the foot, tinging the sole. The 

 general organisation is also the same in both, with the only 

 difference that in the genital organs the amatorial sac is entirely 

 absent. The end of the seminal receptacle is attached by a fine 

 thread to the anterior part of the prostata, and the albuminous 

 gland of the uterus is comparatively larger than in attegia. 



