a AER es 
Mollusca of Great Britain. 387 
Planorbis deformis. Lam. Hist. des Anim. sans Vert. 6. 
p. 154. 
Helix rhombea. Turton’s Conch. Dict. ? 
—-— Draparnaudi. Shepp. in Linn. Trans. 14. p. 158. 
Sparingly among the rejectamenta of the river Taaf 
near Cardiff. It somewhat resembles an over-grown spe- 
cimen of the following; but differs in the disproportionate 
size and medial carina of the last volution, and, above all, 
in its colour and fine transverse striz. 
9. ALBUS. 
10. 
Animal grisescens. Tentacula longa, flexilia. | 
Testa utrinque subumbilicata, perforata, tenuis, pellucida, 
reticulato-striata, albida, epidermide fusco induta. 
Anfractus 5, convexiores. Apertura subrotundo-rhom- 
boidea: peristomio vix soluto. 
m . Long. 0.075.—Diam. 0.2. 
Punon albus. Müll. Verm. 2. p.164.  . 
hispidus. Drap. Hist. des Moll. p. 43. t. 1. 
J.45—18. Lam. Hist.des Anim.sansVert.6. p.154. 
Helix spirorbis. Linn. Syst. Nat. 1. p. 1244. 
—-— alba. Gmel. Syst. Nat. 1. p. 3625. Mont. Test. 
Brit. p. 459. t. 25. f. 1. 
Common on aquatic plants in ditches and slowly-running 
streams. The term ‘souvent hispide," applied by Dra- 
» parnaud to this shell, may perhaps 4 ae a orig inated in an 
accidental erosion of the ph lennis. — —— E. 
GLABER. 
Animal E 
Testa suprà planior, subtüs umbilicata, utrinque perfo- 
rata, 
