AZOREAN GROUP. 21 



that respect it is said to be somewhat on a North-American 

 type, — having, according to Mr. Tristram, a good deal in com- 

 mon with the Helicella suppressa of Say. It is fulvo-corneous 

 in hue, shining, diaphanous, and but feebly striated, but at the 

 same time sufficiently solid in substance ; and the columellary 

 border of its peristome is minutely and shortly expanded, or 

 thickened, at the point of its insertion, — so as to seal-up the 

 spot which is usually occupied by the umbilical perforation. 



Both Morelet and Drouet speak of a small variety of this 

 species as occurring in Fayal, and which measures only 5 milli- 

 metres (instead of about 9) across its broadest part. 



G-enus 7. PATTTLA, Held. 



(§ Patuhe normales.) 



Patula rotundata. 



Helix rotundata, MillL, Verm. Hist. ii. 29 (1774) 

 Patula rotundata. Held, in Isis, 916 (1837) 

 Zonites rotundatus, Gray, Man. 165, t. 5. f. 44 (1840) 

 Helix rotundata, Morel., Hist Nat. des Agor. 174 (1860) 

 „ „ Drouet, Faun. Agor. 156(1861) 



„ „ Paiva, Mon. Moll. Mad. 81 (1867) 



Habitat ins. omnes (sec. Drouet) ; vulgaris, ac late diffusa. 



According to Morelet the common European P. rotundata 

 ' est extremement multipliee aux Azores,' but he does not 

 mention in what particular islands he met with it. Drouet, 

 however, supplies the required information by adding ' Habite 

 tout I'archipel' ; though whether that expression (as in other 

 places) is used indefinitely, or whether it means to imply that 

 he has actually taken the species in the tvhole nine islands 

 of the Group, I have no mean of ascertaining ; and I can there- 

 fore only tabulate the range in accordance with the terms in 

 which it is asserted. Morelet speaks of the Azorean examples 

 of this Patula as being slightly different from the ordinary con- 

 tinental ones. ' Elle constitue,' says he, ' dans ces iles, une 

 variete locale, plus convexe que le type, plus fortement striee, et 

 dont les tours de spire sont aussi plus nettement separes.' 



The P. rotundata has been introduced within the last few 

 years into Madeira, where however it is extremely rare ; but 

 hitherto it has not been observed at the Canaries. 



(§ AcantMnuht, Beck.) 



Patula monas. 



Helix monas. Morel., Hist. Nat. des Agor. 173. t. 3. f. 5 

 (1860) 

 „ „ Drouet, Faun. Agor, 156 (1861) 



