CANARIAN GROUP. 333 



the European H. aculeata, Miill.) approaches nearer to the 

 P. placida than it does to the pusilla ; nevertheless in the fact 

 of its surface being furnished with a few distant, oblique, hair- 

 like costee (which however are occasionally developed into 

 elongate lamelliform processes, or even spines) it partakes more 

 of the peculiarities of the latter. It is both larger and more 

 convex than even the placida, and of a more dull hyaline 

 brown ; whilst the extraordinary tendency for the development 

 of its line-like lamellce into spiniform appendages (sometimes 

 monstrously expressed, even though occasionally worn and in- 

 distinct) completely removes it from the pusilla, — in which these 

 additional thread-like lines are in a comparatively undeveloped 

 state, and seldom very conspicuous. 



Genus 9. HELIX, Linne. 

 (§ Vallonia, Risso.) 



Helix pulchella. 



Helix pulchella, Mull., Hist. Verm. ii. 30 (1774) 

 „ „ Lowe, Carnhr. Phil. 8. Trans, iv. 45 (1831) 



„ „ Id., Proc. Zool. Soc. Lond. 176 (1854) 



„ „ Alb., Mai. Mad. 45. t. 12. f. 1-4 (1854) 



„ „ Paiva, Man. Moll. Mad. 77 (1867) 



„ „ Mouss., Faun. Mai des Can. 57 (1872) 



Habitat Canariam Granclem, Teneriffam, et Palmam ; hinc 

 inde sub lapidibus, prascipue in cultis. 



The minute European H. pulchella, which occurs also in the 

 Azorean and Madeiran archipelagos, and which I detected during 

 1875 in the intermediate districts of St. Helena, and which was 

 found by Mr. Benson at even the Cape of Good Hope, is widely 

 spread over the Canarian Group, — where in all probability it 

 will be ascertained, sooner or later, to be universal. Hitherto 

 however it has been observed only in Grand Canary, Teneriffe, 

 and Palma, in the first and third of which I have myself met 

 with it. Indeed on the western side of Palma it appeared to 

 be common, — on the calcareous Llanos (in the region of La 

 Banda) between Argual and the sea. And it would seem to 

 have been found in the same island by Blauner ; as well as in 

 Teneriffe by Fritsch and Mr. Lowe, — the former of whom 

 obtained it about Sta. Cruz and towards Point Anaga, and the 

 latter at Garachico. The only form of the shell which I have 

 as yet seen corresponds with the true pulchella, Miill., and not 

 with the costata — which elsewhere is so often intermixed with 

 the type. 



