CANARIAN GROUP. 371 



line, and the other 3 above it. The nucleus is minutely granu- 

 lose, but much less coarsely so than in the H. Glasiana. 



The H. Fritschi may be said to be the Gomeran representa- 

 tive of the H. nivarice (rather than of the H. malleata) of 

 Teneriffe, and of the H. Glasiana of Grand Canary. It was 

 met with abundantly by Mr. Lowe and myself, as it had been 

 previously by Fritsch, on the hill-sides above San Sebastian ; 

 and Mr. Lowe obtained it subsequently, in great profusion, in 

 a subfossil condition, at Hermigua, on the opposite side of the 

 island. 



( Hktp&rypha, Hartm.) 

 Helix pisana. 



Helix pisana, Mull., Venn. Hist. ii. 60 (1774) 



Lowe, Cambr. Phil. S. Trans, iv. 52 (1831) 

 W. et B., Ann. des Sc. Nat. 28. 6 (1833) 

 d'Orb., in W. et B. Hist. 58 (1839) 

 Lowe, Proc. Zool. Soc. Lond. 171 (1854) 

 Alb., Mai. Mad. 21. t. 3. f. 1-18 (1854) 

 Paiva, Mon. Moll. Mad. 70 (1867) 

 Mouss., Faun. Mai. des Can. 28 (1872) 

 Pfei/., Mon. Hel. vii. 227 (1876) 

 var. geminata. 



Helix pisana, v. geminata, Mouss., Schw. Denks. xv. 132 



(1857) 



geminata, Id., Faun. Mai. des Can. 29 (1872) 

 Pfeif., Mon. Hel. vii. 228 (1876) 



var. Grasseti. 



Helix planata (pars), W. et B. [nee Chemn.] Ann. des Sc. 



Nat. 28. syn. 312 (1833) 

 pisana monstrosa (pars), d'Orb., in W. et B. Hist. 59 



(1839) 

 , Grasseti, Tarnier in litt. 



Mouss., Faun. Mai. des Can. 31. pi. 2. 



f. 33,34(1872) 

 Pfeif., Mon. Hel. viii. 228 (1876) 



Habitat Lanzarotam, Fuerteventuram, Canariam Grandem, 

 TenerirTam, Gomeram, et Palmam (in Hierro sola adhuc haud 

 observata) ; calcareos inferiores prsecipue colens. Etiam semi- 

 fossilis in Fuerteventura a cl. Mousson occurrere dicitur. 



After a very careful comparison of the almost endless phases 

 (both in outline and colour) which cluster around (in the Cana- 

 rian archipelago), or radiate from, the normal state of the com- 

 mon European H. pisana, I have been driven to the conclusion 

 that not one of them can be held as specifically distinct, for 



B B 2 



