Mollusca of Great Britain. 359 
3. REVOLUTA. 
Animal 
Testa subventricosa, subattenuata, albida, glabra. Anfrac- . 
tus 5, sensim minores, suturá levi. Apertura suborbi- 
cularis, extrinsecalis, edentula, nec marginata: peri- 
stomio postice subreflexo. Umbilicus dilatatus, com- 
pressus, foramine cylindrico. 
Long. 0.1.—Diam. 0.05. 
Among the rejectamenta of a small stream at Marino 
near Swansea, where only one specimen has as yet occurred 
tome. The umbilicus is much more flattened and open than 
in the rest of the genus. 
4. CYLINDRICA. 
Animal 
Testa attenuata, pellucida, striis argutis obliquis, pallidé 
fusca. Anfractus 5, suturá profundá. Apertura ovata, 
| extüs parüm. marginata, edentula. Umbilicus angus- 
tatus. 
Long. 0.075.— Diam. 0.03. 
Pupa muscorum (a). .Drap. Hist. des Moll. p. 59. 
Vertigo cylindrica. Fér. Tab. des Moll. p. 64. 
Of this very beautiful little shell I found a single live 
specimen on the under side of: a loose stone on Durdham 
Downs near Bristol ; but I regret that 1 did not at it the, etime 
examine the animal. Ee qe e 
5. VULGARIS. | sl eee 
Animal Sipto-prisefifh,. Blalen Tentacula nudo oculo 
nequaquàm discernenda, armato punctiformia viden- 
tur. P^ . 
VOL. XVI. 3A — . Testa 
