Mollusca of Great Britain. 343 
Helix umbilicata. Mont. Test. Brit. p. 434. t. 18. f. 2. 
Maton & Rackett in Linn. Trans. 8. p. 200. Dillo. 
Cat. 2. p. 915. 
—-—- rupestris, 8. Drap. Hist. des Moll. p. BA. (. T. 
NC. 
Very plentiful in the crevices of limestone-rocks near 
Swansea, Tenby, and other parts of South Wales; and in 
the rocks near Bristol. 'The animal walks with its shell 
erect, owing to the shortness of its foot. 
27. PyaM Za. 
Animal nigro-griseum, politum. Tentacula superiora fili- 
formia, approximata.  Sustentaculum longius. 
Testa subdepressa, pellucida, subtiliter striata, pallidé brun- 
nea. Anfractus 3—4, globosi. Apertura compressa, 
suborbiculata: peristomio simplici, marginibus dis- 
junotise Umoilicus patulus, sinu profundo. 
i Long. 0.025.— Diam. 0.06. 
Helix pygmea. Drap. Hist. des Moll. p. 114. t. 8. 
f. 8—10. | 
—-— Kirbii. Shepp. in Linn. Trans. 14. p. 162. 
At the roots of rushes in a marshy piece of ground at 
Marino near Swansea. 
**** Depresse ; peristomio incrassato, reflexo. 
28. PuLcHELLA. | 
Animal croceo-lactescens, pellucidum. Te | 
via; superiora cylindric 2 
Testa pellucida, nitida, subtiliter striata, albida. Bude 
3—4, subglobosi. Umbilicus patens, sinu profundo. 
Apertura suborbicularis : peristomio Subeontintos 
Long. 0.04.—Diam. 0.1. 
VOL. XVI. 2Y - Helix 
