314 TEST ACE A ATLANTICA. 



Vitrina Lamarckii, Pfeif\, Mon. Hel. ii. 506 (1848) 



„ „ Mouss., Faun. Mai. des Can. 12 (1872) 



„ Lamarcki, Pfeif., Mon. Hel. vii. 19 (1876) 



Habitat Teneriffam, et (sec. Mousson) Palmam et Hierro ; 

 in sylvaticis intermediis humidis prsecipue degens. 



This usually large Vitrina is the universal one throughout 

 the sylvan regions of TenerifFe ; but I am not positive that 

 I have myself observed it in any of the other islands of the 

 Grroup, though it is stated by Mousson to occur both in Palma 

 and Hierro.' In TenerifFe however it is tolerably general, at 

 intermediate and rather lofty altitudes, — having been met with 

 by Mr. Lowe and myself about the Vueltas above Taganana, at 

 the Agua Grarcia, near Ycod el Alto, and in many other spots. 



As implied at p. 78 of this volume, the V. Lamarckii 

 would seem to take the place in (at all events) Teneriffe of the 

 V. nitida at Madeira ; and indeed there can be no doubt that 

 the two species have a good deal in common. Nevertheless I 

 feel assured that they are not absolutely identical : from which 

 it follows, that if the Canarian one is to be accepted as the type 

 of Ferussac's Helicolimax Lamarckii (which appears to be 

 inevitable, inasmuch as it was recorded in the original diagnosis 

 as having come from Teneriffe), the Madeiran one (although 

 known hitherto, unfortunately, in Mr. Lowe's works, as the 

 ' V. Lamarckii, Fer.') must be quoted by the next name (in the 

 order of priority) under which it was described ; and that title 

 is (as has already been shewn) the ' nitida^"* of Grould. 



Judging from a considerable series which I have inspected, 

 I should say that the V. Lamarckii, proper, is, on the average, 

 a rather larger and flatter shell than the Madeiran V. nitida, 

 with its aperture even relatively still more developed (or out- 

 wardly-produced, and elongated), and with its spire (which has 

 at least half a volution less) more depressed, and the left-hand 

 margin of its peristome, adjoining the columella, much more 

 broadly, and decidedly, membraneous. From which it will be 

 seen, that in some of its characters it would appear to make a 

 slight approach, at first sight, to the V. ruivensis of the Ma- 

 deiran archipelago, whilst in others (as just stated) it resembles 

 the nitida ; a circumstance which may perhaps account for 

 Mr. Lowe having regarded it, successively, as identical with 

 them both, — referring it, imder the title ' V. Teneriffm, Q. et 

 G.' to the former, and under that of ' V. Lamarckii, Fer.' 



' I say 'positive,' because the examples in my collection from Hierro 

 which were referred by Mousson to the V. Lamarckii appear to me to belong 

 most unmistakeably to the V. latchasis ; and I am not aware that there is any 

 other evidence for tlie existence of the V. Lamarckii in Hierro except that 

 which is supplied by my own material. 



