816 TEST ACE A ATLANTIC A. 



Habitat Palmam, et Hierro ; in huinidis sylvaticis editiori- 

 bus praecipue gaudens. 



The present Vitrina is, od the average, smaller, and a little 

 paler, than the V. Lamarckii, its spire is a trifle more de- 

 pressed, its aperture is relatively not quite so large, and its 

 lower lip is not so broadly and conspicuously membraneous. 

 But the character by which it seems to me to be the most 

 easily separated consists in the fact of its nucleus (or apical 

 volutions) being always more or less sculptured with (often very 

 conspicuous) radiating costae, — which are strongly expressed in 

 the examples from Palma, though rather less so in those from 

 Hierro. 



The V. latebasis would appear to stand in much the same 

 relation to the Lamarckii as the V.marcicla, Gould (or media, 

 Lowe) does, in the Madeiran Group to the nitida, Gould (the 

 Lamarckii, Lowe, nee Fer.). Indeed, in their reduced stature 

 and somewhat paler hue, the V. latebasis and the Porto-Santan 

 V. marcida have a good deal in common ; nevertheless the 

 former is a little more decidedly flattened as regards its spire, 

 its lower lip is less broadly membraneous, and its apical volu- 

 tions are sculptured (as just mentioned) with radiating, and 

 often granulated, costae. 



This Vitrina was met with by Fritsch in Palma, and by 

 Mr. Lowe and myself in that island and Hierro. I possess 

 indeed a few examples, taken in the wood of Las Mercedes in 

 Teneriffe, which, from their small size and pallid hue, might 

 well be supposed to belong to the V. latebasis ; but since I can 

 detect no traces of radiatiug costae about their (nevertheless 

 granulated) nucleus, I think perhaps it would scarcely be safe 

 to treat them as conspecific with those from Palma and Hierro. 

 My Palman examples are from the Barranco de Agua, the 

 Barranco de Galga, and the Barranco de Herradura, as well as 

 from Barlovento and about the Vueltas leading up to the Cumbre 

 above Buenavista ; whilst the Hierro ones are from the sylvan 

 district of El Golfo. 1 



Vitrina Blauneri. 



Vitrina Blauneri, ShuttL, Bern. Mitth. 138 (1852) 



„ „ Mouss., Faun. Mai. des Can. 14. pi. 1. 



f. 7-9 (1872) 

 „ „ Pfeiff., Man. Eel. vii. 20 (1876) 



1 I possess two exceedingly young individuals of the V. latebasis, taken on 

 the Curnbre in Palma, which at first sight it somewhat puzzled me to identify. 

 They are so extremely minute as to consist only of the nucleus ; and as that 

 particular portion of the shell is sculptured (as just stated) with oblique 

 radiating costa?, their primd facie appearance is very peculiar. 



