260 MOLLUSCA. PULMONIFERA. Helix- 



58. H. albella. — Shell flat above, with a carinated edge ; gib- 

 bous beneath. 



Cochlea alba, List. Conch, t. 80. f. 81 — H. alb. Linn. Syst. 1242. Drap 

 Moll. 113 On the shore, St Andrew's. 



Shell dusky yellowish-white, minutely striated by the lines of growth. 

 Whorls 3 or 4, the line of separation distinct, but the spire very little raised. 

 Mouth rather wide at the pillar. Draparnaud states, after Muller, that three 

 spires can be seen in the pillar cavity ; a mistake, probably arising from the 

 latter contemplating a dead specimen of Planorbis corneus, instead of the true 

 albella. By the former, that animal is said to frequent rushes on the coast. 

 A single dead specimen of this shell, in my possession, was found in 1810, on 

 the shore at St Andrew's. 



59- H. terrestris. — Spire conical, whorls flat, carinated at 

 the base. 



Trochilus Monspessulanus, List. Conch, t. Gl. f. 58 — Trochus terrestris, 



Penn. Brit. Zool. iv. 127. Don. Brit. Shells, t. iii. Mont. Test. Brit. 



287 — H. elegans, Drap. Moll. 70 — England, rare. 



Shell whitish, striated longitudinally ; whorls 5 or G, nearly flat, divided 



by a very small depressed line, with a prominent ridge at the base»of each ; 



apex produced, but not very pointed ; mouth compressed, angulated ; base 



flat, striated from the centre This species has hitherto been found only in 



Northamptonshire by Morton, and Cumberland by Hudson. 



60. H. Trochilus. — Spire conical ; whorls rounded. 



. Buccinum parvum sine Trochilus sylvaticus, List. An. Ang. 123 — H. 

 Troch, Mull. Verm. ii. 70.— H- trochiformis, Mont. Test. Brit. 427. 

 —In moist situations, rare. 

 Shell thin, pellucid, horn coloured ; whorls 6, rounded, and strongly divid- 

 ed by the separating line ; 'apex considerably produced ; mouth transverse, 

 narrow ; lip a little reflected on the pillar cavity. Montagu has found this 

 species in Wiltshire and Devonshire among decayed wood. A specimen, 

 found in the south of Fife, was presented to me by Mr Chalmers, surgeon, 

 Kirkcaldy. 



61. H. Turtoni. — Shell flat on both sides, with a rounded 

 margin. 



H. rotundata, Turton, Conch. Diet. 53. 

 " Shell quite flat and level on both sides, dark horn coloured, with trans- 

 verse chesnut marks or blotches, which, however, are not in a regular ra- 

 diate manner, with the perforation rather large, but not exhibiting the inter- 

 nal volutions ; spires 6, rounded and well defined, crossed with regular, close 

 set, fine, rather oblique, raised lines ; the larger volution rounded at the mar- 

 gin and without the faint keel-like appearance ; aperture large, roundish, 

 crescent shaped, the margin thin and not reflected over the perforation ; dia- 

 meter not a quarter of an inch." Such is the description of a singular spe- 

 cies found by Dr Turton in the woods near Brecon. It is not the H. rotun- 

 data of Muller, though probably a variety of his H. obvoluta, Hist. Venn, 

 ii. 27- 



** Preceding whorls in part exposed by the pillar cavity. 



62. H. ericetorion. — Whorls six, rounded, subdepressed ; 

 mouth suborbicular ; pillar cavity very wide. 



