96 HELICIDiE. 



KtTSTER, p. 22, pi. 3, f. 10, 11, 12.— Morelet, Moll. 



Portugal, p. 74. — L. Pfeif. Monog. Helic. vol. ii. p. 329. 

 Helix umbilicata, Ferus. Prodrom. 474 (Cochlodonta). 

 Pupa muscorum, Fleming, Brit. Anim. p. 268. — Brown, Ulust. Conch. G. B. 



p. 39 (probably), pi. 18*, f. 38, 38*. 

 Pupilla umbilicata, Beck, Index Moll. Mus. Christ. Frid. p. 84. 

 Eruca „ Swainson, Malacology, p. 334. 



Stomodonta umbilicata, Mermet, Moll. Pyren. p. 53. 

 Pupa bidentata, Brown, 111. Conch. G. B. p. 39, pi. 14, f. 6 (probably). 



Shell small, oblong-cylindrical, or subcylindrical, but 

 distinctly tapering, thin, somewhat pellucid, pale olivaceous 

 brown, or fulvous horn-coloured, shining, indistinctly strio- 

 late, and chiefly so near the sutures. Whorls six or 

 seven, rounded, distinctly though gradually enlarging; the 

 last about equal to two-fifths of the entire length ; apex 

 more or less blunt. Aperture obliquely semi-oval, nar- 

 rowed, and angular below (or anteriorly), usually (there 

 exists an edentulous variety) provided with a laminated or 

 angular tooth closely adjacent to the junction of the outer 

 lip with the body, and often connected with, and sub- 

 parallel to the former. Peristome broadly and flatly re- 

 flected, especially at the columella, unarmed, white or 

 stained with rufous. Columella longer than the space 

 between it and the outer lip. Base compressed, broadly 

 perforated ; umbilicus bounded by a kind of rib-like fold. 

 Length the ninth of an inch ; breadth the twentieth of 

 an inch. Da Costa, as usual, whilst regarding this species 

 as the muscoi'um of Linnaeus, endeavoured to substitute a 

 name of his own selection. 



In this species and in Pupa anglica* Mr. Alder was 

 first to observe that a spiral ridge or lamina runs around 

 the columella, and another in the centre of the upper side of 

 the whorls, whilst they are crossed by small flat transverse 

 laminse like rudimentary partitions. The structure is not 



