462 TEST ACE A ATLANTIC A. 



must remain an open question to which of them this apparently 

 somewhat osculant form is more properly to be referred. 



Even of the L. attenuata, however, as here understood, 

 there appears to be a larger and a smaller state, differing in 

 nothing, I think, except in size ; and therefore as Mousson 

 speaks of his Cionella attenuata as being conspicuously smaller 

 than the lanzarotensis, it would seem to follow that the com- 

 paratively minute examples of the shell were the only ones he 

 possessed from which to compile his diagnosis. The examples 

 which I have measured vary from about 4 to nearly 5J lines in 

 length. 



Lovea vitrea. 



Achatina vitrea, W. et B., Ann. des Sc. Nat. 28. syn. 320 

 (1833) 



Bulimus vitreus, d'Orb., in W. et B. Hist. 72. t. 2. f. 28 



Q839) 

 ,, Pfei/., Man. Eel., iv. 453 (1859) 



Cionella vitrea, Mouss., Faun. Mai. des Can. 131 (1872) 



Ferussacia vitrea, Pfeiff., Mon. Hel. viii. 303 (1877) 



Habitat Lanzarotam, et Fuerteventuram [necnon sec. W. et 

 B., sed hand vere, Teneriffam] ; sub lapidibus, praecipue in 

 humidis, occurrens. 



The straightened, rather cylindric-oblong outline of this com- 

 paratively small, very highly polished, pellucid, and pale greenish- 

 yellow, or olivaceo-corneous, Lovea (which measures from 

 about 3 to 3J lines in length), added to the thinness of its 

 substance, the excessive obliquity of its suture, its enlarged and 

 slightly tumid penultimate volution, its acute, unthickened 

 peristome, and its somewhat short and posteriorly rounded (or 

 unangulate) aperture, will sufficiently distinguish it. 



The only island in which I have myself met with the 

 L. vitrea is Fuerteventura, where I secured many examples of 

 it at the edges of a tank, near Sta. Maria Betancuria, in the 

 Eio Palmas (a spot in which it was found subsequently, also, 

 by Mr. Lowe), as well as on the ascent of the Monte Atalaya ; 

 and although it is stated by Webb and Berthelot to occur in 

 damp places in ' Teneriffe,' I nevertheless reject that habitat 

 altogether as having been founded (like so many of Webb's 

 localities) on inaccurate data, seeing that no other island is 

 cited for it by them, and I myself possess three original types, 

 which were sent by Webb to Mr. Lowe in 1829 (and which 

 agree precisely with others in the d'Orbignyan cabinet at the 

 British Museum), marked expressly as having been obtained in 

 6 Lanzarote ' an island in which, in point of fact, it has 

 subsequently been collected by Fritsch. There can be no 



