CANARIAN GROUP. 467 



rather exserted and acute, with tlie whorls somewhat convex, 

 and the nucleus whitish and tilted ; its aperture is furnished 

 with a large plait on the lower portion of the ventral paries (the 

 upper minute or tuberculiform one being usually altogether 

 absent), and another, which is much more obtuse and less 

 defined, on tlie columella ; and the outer lip of its peristome is 

 totally simple, or unarmed. 



Fam. 6. LIMN^ID^. 



Genus 16. LIMNJEA, Drap. 



[scrijjt. Limiieus.] 



Limnsea truncatula. 



Buccineum truncatulum, M'dlL, Verm. Hist. ii. 130 (1774) 

 Limneus minutus, Drap., Hist. Nat. 53. t. 3. f. 5-7 (1805) 

 Limnceus truncatulus, Loiue, Proc. Zool. Soc. Land. 218 



(1854) 

 Limnaea truncatula, Paiva, Mon. Moll. Mad. 146 (1867) 

 „ „ Watson, Journ. de Conch. 224 (1876) 



Habitat 'Canaries' (sec. Dom. Watson); mihi non obvia. 



I did not myself observe this widely spread little Limncea 

 at the Canaries, nor indeed is it recorded from thence by 

 Mousson ; nevertheless Mr. Watson cites it as occurring in 

 the archipelago, though he does not mention in what par- 

 ticular island he met with it. But considerino- how universal 

 it is at Madeira, and how liable it must be to accidental dis- 

 semination, we should naturally expect it in the neighbouring- 

 Group. It is a common species in central and southern 

 Europe, as well as in the north of Africa. 



Genus 17. PHYSA, Drap. 



Physa acuta. 



Physa acuta, Drap., Hist. Nat. 55. t. 3. f. 10, 11 (1805) 

 „ ,, W. et B., Ann. des Sc. Nat. 28. syn. 322 



(1833) 

 ,, „ d'Orh., in W. et B. Hist. 74 (1839) 

 „ subopaca, Bourg., Amen. Mai. i. 172 (1856) 

 „ fontinalis, Paiva [nee Linn.'], Mon. Moll. Mad. 147 



(1867) 

 „ tenerifsB, Mouss., Faun. Mai. des Can. 137 (1872) 

 „ acuta, Watson, Journ. de Conch. 224 (1876) 

 var. Tnajor. 



Physa ventricosa, Mouss., I.e. 139 (1872) 



11 H 2 



