556 Mr. Jeffreys on the Testaceous Pneunomobranchous 



the shell is clothed with an earthy covering like that of the 

 Bulimus obscurus. This seems a provisional defence to the 

 animal until the teeth of the aperture are completely formed, 

 when it divests itself of its coat by rubbing the shell against 

 extraneous substances ; and it is one of the many and va- 

 rious contrivances of nature which we cannot sufficiently 

 admire. 



This is not the Grain d'avoine of GeofFroy, to which as 

 well as the Pupa avena of Draparnaud, Ferussac has re- 

 ferred it. The Helix ventricosa of Miiller is without doubt 

 this species in its young state. 



2. RiNGENS. 



Animal 



Testa ventricosa, nitida, glabra, fulva. Anfractus 5, sutur^ 

 lineari. Apertura elongato-lunata, plicis 5, inaequali- 

 bus, nempfe 3 columellaribus et 2 labralibus instructa : 

 peristomio fulvo, subincrassato. Umbilicus foramine 

 cylindrico. 



Long. 0.115. — Diam. 0.065. 

 Vertigo anglica. F6r. Tab. des Moll. p. 64. 

 From the neighbourhood of Scarborough by Mr. J. S. 

 Miller. 



3. Umbilicata. 



Animal nigro-griseum, politum. Tentacula superiora ar- 

 cuata. 



Testa cylindracea, glabra, nitida, fulvescenti-cornea. An- 

 fractus 5 — 7. Apertura elongato-lunata, plic^ unic4 

 columellari et alik interddm tenuiori in ipso columellae 

 labio instructa : peristomio subincrassato. Umbilicus 



angustatus, foramine cylindrico. 



Long. 



