Mollusca of Great Britain. 861 
On the waterflag in marshy ground at Marino near 
_ Swansea, and among the rejectamenta of the Avon river 
near Bristol. 
The Helix minuta of Müller, referred by Montagu with 
doubt to the present species, is probably the Cyclostoma 
vitreum of Draparnaud (a variety of the Paludina acuta), 
and is a freshwater shell. 
Genus IX. VERTIGO. Müll. 
Animal corpore attenuato.  Tentacula inferiora punctiformia, 
valdé indistincta. 
Testa cylindraceo-fusiformis, spirá brevi, sinistrorsà. Apertura 
extüs marginata, sinuata, intùs denticulis coarctata : 
peristomio subreflexo. 
I. PUSILLA. 
Animal griseum, subtüs pallidius. Sustentaculum angustum. 
Testa ventricosior, attenuata, glabra, nitidula, fragilissima, 
pallidé fusca. Anfractus 5. Apertura subquadrata, 
subtüs rotundata, lamellis 6—7 albis, nempé 2 vix 3 
columellaribus et 4labralibus munita: peristomio tenui. 
Umbilicus subangustatus. 
Long. 0.085.—Diam. 0.045. 
Vertigo pusilla. Müll. Verm. 2. p. 124. 
Pupa Vertigo. Drap. Hist. des Moll. p.61. t.3.f.34,35. 
Alive under moss in a coppice at Newton near Swansea, 
and among. the Tecin coia a Be Avon rivet near Bristol. 
2. ANGUST IOR. 
Animal - 
Testa ventricosior; subdolioliformis, pallide fulva, argute et - 
3429 3 lentissimé 
