CANADIAN GROUP. 449 



short diagnosis of it which was given by Shuttleworth. But 

 as it is said to be closely allied to the European P. minutissima, 

 Hartm., 6 mais encore plus petite, plus fortement costulee, et 

 forme d'un moindre nombre de tours,' it would seem in all pro- 

 bability -to have much in common with the subfossil P. linearis 

 of the Madeiran Group, even if it be not absolutely identical 

 with it. Indeed it is quite evident that the linearis, Lowe, 

 and the atomus, Shuttl., together with the minutissima, 

 Hartm., of Europe, and the molecula, Dohrn, from the Cape 

 Verde archipelago, are intimately connected. However I have 

 already recorded my conviction that at any rate the first and 

 last of these four species are distinct from each other ; but it 

 remains yet to be ascertained whether the Canarian P. atomus 

 can be regarded as a geographical modification of either of 

 them. 



Pupa midrospora* 



Pupa microspora, Lowe, Ann. Nat. Hist. ix. 275 (1852) 

 Id., Proc. Zool. Soc. Lond. 207 (1854) 



Alb., Mai. Mad. 61 (1854) 



edentata var., Paiva, Mon. Moll. Mad. 119 (1867^ 

 microspora, Mouss., Faun. Mai. des Can. 124 (1872) 

 Pfei/., Mon. Hel. viii. 357 (1876) 



Habitat Teneriffam, et Palmam ; in sylvaticis editioribus, ad 

 frondes filicum humidas, a meipso copiose inventa. 



The little P. microspora, which is so abundant at a high 

 elevation in the damp sylvan districts of Madeira, and which is 

 recorded also from the Azores, was captured by myself in con- 

 siderable profusion in the Canarian archipelago, namely at Las 

 Mercedes, Ycod el Alto, &c., in Teneriffe, and on the ascent to 

 the Cumbre above Buenavista in Palma. My examples were 

 nearly all obtained from off the fronds of ferns, while brushing 

 for insects, a fact which implies a modus vivendi precisely 

 similar to what I have observed in the Madeiran Group. The 

 characters of the species have been already so fully pointed out 

 at p. 208 of this volume, that I need not again allude to them. 



( Gastrodon, Lowe.) 



Pupa fanalensis. '. 



Pupa fanalensis, Lowe, Ann. Nat. Hist. ix. (1852) 

 Id., Proc. Zool. Soc. Lond. 208 (1854) 



umbilicata, var., Paiva, Mon. Moll. Mad. 121 (1867) 

 debilis, Mouss., Faun. Mai. des Can. 124 (1872) 

 anconostoma (pars), Pfeiff., Mon. Hel. viii. 370 (1876) 

 G a 



