222 P. Stoliczka— Notes on Terrestrial Mollusca. [No. 3, 



suredin the longer diameter 35 mm., but specimens of half the size, 

 and even smaller than that, often have all the appearance of being 

 full grown. "The amount to which the aperture is deflected varies, 

 but I never saw a specimen in which it was entirely turned down- 

 wards, as shewn in Kiister's figure. 



The usual colour is rufous brown above, albescent below, with 

 the mouth deep or pale lilac about the peristome. In caves, 

 secluded shady localties, and under large stones, white or yellow- 

 ish white specimens are often found, the peristome being in this 

 case also white. The colour of the animal varies as much as that of 

 the shell ; it is rarely white, more often grey or brownish black ; 

 in the former case the head, pedicles and tentacles and the foot 

 in front are grey, in the latter these organs are only somewhat 

 paler than the general dark coloration of the body. 



Plectopylis cyclaspis, Bens., pi. xv, figs. 4 — 6. 



Helix cyclaspis, Benson, vide Pfeiff. Mon. Hel., v, 414. — Hanley and Theob., 

 Conch. Indica, pi. xiii, fig. 10.* 



When the shells are well preserved and perfectly fresh they 

 possess a coarsely serrated fringe of horny cuticle at the peri- 

 phery of the last whorl ; this fringe is, however, very easily worn 

 off in older shells even during life. The two embryonal whorls 

 are almost always yellowish albescent, the third is uniform brown, 

 and the following become marbled and banded with white and 

 brown. The spiral striation round the umbilicus, particularly 

 alluded to in Benson's description of the species barely deserves 

 the name ; it is generally very indistinct and caused by the at- 

 tachment of the fine hairs of the cuticle, this being there a little 

 more strongly developed than on the rest of the lower surface, 

 but the rugosity generally is hardly more apparent than on the 

 upper side of the shell. 



The internal plication is situated at a distance from the aper- 

 ture of one-third of the last circuit. It consists on the inner lip 

 of a large, transversely oblique, erect lamella, on the inner end 

 produced into an anterior short fold ; on the outer, or peripheri- 

 al, side it is divided posteriorly into two folds, the outer o f which 

 * An entirely insufficient illustration of the species j 



