CANADIAN GROUP. 381 



This is a species which was found by Fritsch, in the Valle de 

 Gran-Key, in Gromera ; and as it appears to have been in a sub- 

 fossil condition, it may perhaps have become extinct, though 

 this is a question which can only be solved by future, and more 

 careful, researches, in the same island. I have had no oppor- 

 tunity of inspecting it ; but it is compared by Mousson to the 

 Porto-Santan H. depauperata, Lowe, of the Madeiran archi- 

 pelago ; and, judging from the figure, it would certainly seem 

 to have something in common (as regards size, sculpture, and 

 contour) with that species. 



In his remarks which follow the diagnosis, Mousson says: 

 ' Tout le test est convert de granulations allongees dans le sens 

 des stries d'accroissement et tellement serrees, qu'elles semblent 

 resulter de deux systemes de sillons se croisant sous un angle 

 tres aigu. L'ombilic est mediocre, ne s'evase que peu et 

 s'enfonce presque cylindriquement. L'ouverture est assez ob- 

 lique, presque circulaire et peu modifiee par Favant-dernier 

 tour. Le peristome peu evase au bord superieur, reflechi et 

 labie a Pinferieur, se continue dans la callosite un peu detachee 

 qui relie les deux bords. Le nucleolus est plus grand qu'ordi- 

 nairement et lisse. Parmi les especes de Madere, YH. depau- 

 perata, Lowe (Pfr. Mon. No. 493) s'en rapproche le plus, mais 

 elle a les tours plus serres et plus convexes, le pourtour moins 

 anguleux, les stries plus grossieres et plus irregulieres, par contre 

 les granulations beaucoup plus fines. Toutefois elle fixe la 

 place de notre espece dans la systeme ' (I. c. pp. 59, 60). 



( Spirorbula, Lowe.) 



Helix paupercula, 



Helix paupercula, Lowe, Cambr. Phil. S. Trans, iv. 47. t. 5. 



f. 19(1831) 



Id., Proc. Zool. Soc.Lond. 175 (1854) 



Alb., Mai. Mad. 35. t. 8. f. 27-30 (1854) 



Paiva, Mon. Moll. Mad. 61 (1867) 



Mouss., Faun. Mai. des Can. 60 (1872) 



Pfeif. Mon. Hel. vii. 264 (1876) 



Habitat Lanzarotam ; circa Haria, versus borealem insulae, 

 rarissima. 



The solid, flattened, and Planorbiform little H. paupercula, 

 which is composed of about four whorls, the spire being ex- 

 tremely depressed (indeed often a little concave), occurs very 

 sparingly in Lanzarote, where it was obtained originally by 

 M. Hartung, and subsequently (near Haria, in the north of that 

 island) by Mr. Lowe. It is universal throughout the Madeiran 



