CANARIAN GROUP. 405 



Habitat Fuerteventuram, semifossilis ; a cl. Fritsch lecta. 



A small species, found likewise by Fritsch in Fuerteven- 

 tura, and only in a subfossil condition. Indeed, as in the 

 case of the H. Tuorata, Mousson appears to have had but a 

 single example to describe from. The following are his re- 

 marks concerning it : ' Cette petite espece, qui se lie a la 

 rtiorata, appartient encore a une faune passee. Elle est plus 

 petite, plus applatie, et se distingue de ses voisines par la de- 

 viation considerable du dernier tour, ce qui degage I'ombilic sur 

 \ de son pourtour. La surface est tres finement reticulee, par 

 des stries costidees serrees et des lignes spirales plus distantes, 

 ce qui produit une fine granulation ponctiforme un peu allongee. 

 Des taches blanches opaques alternent avec d'autres un peu cor- 

 nees et diaphanes, et produisent sur la car^ne et le long de la 

 suture un faible ondulation, ce que provient d'une plus facile 

 destructibilite des parties comees a cote des opaques. Le seul 

 individu de cette espece est a I'etat subfossile et altere.' 



(§ Lemniscia, Lowe.) 



Helix tumulorum. 



Helix tumulorum, W. et B., Ana. des Sc. Nat. 28. syn. 



315 (1833) 

 „ „ dOrh., in W. et B. Hist. 62. 1. 1. f. 29-31 



(1839) 

 „ „ PMff', Mon. Hel. i. 216 (1848) 



„ „ Mouss., Faun. Mai. des Can. 43 (1872) 



Hah it at Canariam Grrandem ; in promontorio boreali 



* Isleta ' dicto, praecipue inter tumulos Indigenarum, et recens et 

 semifossilis, occurrens. Necnon semifossilis in calcariis juxta 

 Puerto da Luz, Isletse adjacentibus, parce legi. 



This is the largest member of the Leinniscia section in the 

 Canarian Grroup, and one which has been found hitherto only on 

 the ' Isleta,' — the island-like promontory in the extreme north 

 of Grrand Canaiy, stretching out beyond the village of Puerto da 

 Luz (which is itself a little to the north of Las Palmas). In 

 that particular locality it was found originally by Webb (as it 

 subsequently has been by Lowe, Fritsch, Watson, and others), 

 principally amongst the tombs of the ancient inhabitants of the 

 archipelago, the Gruanches, — a fact which evidently suggested its 

 specific name. 



The H. tumulorum (the largest adult examples of which 

 measure about 5 or 6 lines across the widest part) is, like most 

 of its allies, a thin and rather broadly- or shortly-conical shell, 

 strongly sculptured with the dense oblique transverse lines of 

 growth, with its perforation extremely minute and almost con- 



