AZOREAN GROUP. 37 



sparingly on the mountains in the immediate neighbourhood of 

 the great crater known as the Caldeirao. 



The H. vespertina would seem to be somewhat depressed 

 and lenticular, but with the nucleus nevertheless (as in the H. 

 Woodwardid) prominent, very thin in substance, and glabrous, 

 but not shining. It is of a corneous brown, but has a faint 

 paler band immediately below the rather obtuse keel ; its whole 

 surface is finely and closely striated ; the margins of its peri- 

 stome are remote, but joined by a very thin lamelliform callus; 

 and its umbilicus is small and shallow, the outer edge being- 

 reached (but scarcely overhung) by the very slight columellary 

 dilatation. 



Genus 9. BULIMUS, Scopoli. 

 Bulimus ventrieosus, 



Bulimus ventrieosus, Drap., Tabl. de Moll. 68 (1801) 



Id., Hist. Nat. 78. t. 4. f. 31-33 (1805) 



Helix ventrosa, Fer., Prodr. 377. t. 52 (1807) 



Bulimus ventrosus, Lowe, Cambr. Phil. S. Trans, iv. 62 



(1831) 

 Alb., Mai. Mad. 54, t. 14. f. 18, 19 



(1854) 



Morel., Hist. 'Nat. des Acor. 1 96 ( 1 860) 



Drouet, Faun. Acor. 163 (1861 ) 



Helix ventricosa, Mouse., Faun. Mai. des Can. 46 (1872) 



Habitat ins. omnes (sec. Morelet et Drouet) ; sub lapidibus 

 in aridis, vulgaris. 



This Bulimus, which is so widely spread throughout Medi- 

 terranean latitudes occurring in the Madeiran, Canarian, and 

 Cape-Verde archipelagos, as well as on the west coast of 

 Morocco is found, according to Morelet and Drouet, on every 

 island of the Azorean Group. As elsewhere, it resides princi- 

 pally, beneath stones and about old walls, in dry spots of a low 

 elevation. 1 



Bulimus solitarius, 

 Helix solitaria, Poir., Coq. Fluv. et Terr. 85 (1801) 



conoidea, Drop., Tabl. de Moll. 69 (1801) 

 Theba conoidea, Beck, Ind. Moll. 11 (1837) 

 Bulimus solitarius, Pfeiff., Mon. Hel. ii. 216 (1848) 



Morel., Hist. Nat. des Acor. 196 (1860) 



1 Considering that this common Bulimus was described by Draparnaud, 

 under the name of ventrieosus, in 1801, and by Ferussac under that of ventrosus 

 in 1807, it is difficult to understand why so many authors should quote it 

 under the latter title instead of the former. So long as the law of priority is 

 to be recognized, there is a manifest want of consistency in not following it 

 implicitly. 



