The Shell-Collector’s Handbook. 135 
CLAUSILIA RUGOSA, DRAPARNAUD. 
SHELL cylindrical, fusiform, diaphanous, glossy, chocolate- 
brown or horn-coloured, marked with whitish streaks, 
and with closely-set, strong striz; whorls ten to 
thirteen, the body-whorl slightly narrower than the 
two preceding it; spire tapering, blunt; suture bor- 
dered with white, oblique; aperture oval, pyriform, 
furnished with several plaits—two more or less pro- 
minent ones on the base of 'the penultimate whorl, 
with one to three smaller plaits between them, and 
two on the columella, one semilunar, the other small and 
indistinctly spiral; outer lip white, reflected, detached; 
basal crest sharp, angular; umbilicus narrow; clausilium 
oblong, oval; length 12-14; diam. hardly 3 mill.. Ap. 22 
mill. long, 2 rile. Animal greyish-brown. 
Piuhitat. —Under stones, on walls, and trunks of eee 
and ash trees. 
v. dubia (Drap.): Shell larger, more ventricose. 
(= Clausilia dubia, Drap. Hist. 70, t. 4, f. 10; Alder, Cat. 
Supp. 8, Mag. Zool and Bot. i., 111.) 
v. Everetti (Miller): Shell shorter, whorls fewer. 
(= Clausilia Everetti. Miller, Ann. Phil., n. s. xix., 377, 
1822.) 
v. gracilior (Jeff.): Shell longer and more slender. 
(B. C. vol. i., p. 279.) 
v. tumidula (Jeff): Shell smaller, shorter, and more 
ventricose. (B. C. vol. i., p. 279.) 
v. Schlechtii (Zelebor): Shell generally larger, more 
elongated, smoother, and more transparent than var. 
dubia, pale brown, frequently resembling in external 
appearance Clausilia laminata both in smoothness and 
transparency. 
v. parvula (Turton): Shell smaller, more slender. 
(= Clausilia parvula. Leach, MSS., B. M., Turton, Zool. 
