CANADIAN GROUP. 339 



., which nevertheless is cited by Pfeiffer (Mon. Eel. iv. 

 222, and vii. 332) as occurring in the Canarian Group. 'La 

 forme des Canaries,' says Mousson (1. c. 71), 'appartient bien a 

 la lactea, Miill., et non a la punctata, Mull., et se place entre 

 le type et la var. murina, Kossm. (Icon. in. 800-805), dont 

 Fouverture au bord superieur est encore plus dilatee.' 



Helix gibboso-basalis, n. sp. 



T. imperforata, depresso-globosa, solida, subnitida, striis ob- 

 liquis subevanescentibus irregularibus, aliisque indistinctis mi- 

 nutissimis spiralibus leviter decussata, suffuse subcarneo- et 

 subplumbeo- aut sublivido-brunnea sed subtus in medio obscure 

 et ad peristoma subclarius pallidior [aut, aliter, infuscate palli- 

 dula sed obsoletissime et omnino suffuse 4-fasciata, fasciis 

 versus aperturam nebulose confluentibus] ; spira minus elevata, 

 ad apicem obtusa; anfractibus 4J, ultimo rotundato, antice 

 deflexo; apertura intus subnigra, peristomate (anguste solum 

 expanso) intus nigro-castaneo sed extus pallide brunneo-flavo, 

 marginibus callo.nigro (longe intus sulcato) junctis, columellari 

 lato sed undulato-ingequali, quasi biflexuoso, in medio (aut 

 paulo magis versus insertionem) obtuse gibboso. Diam. maj. 

 12; alt. 7. lin. 



Habitat ' Teneriffam borealem ; ' exemplaria duo a D. Vargas 

 collecta, obtinet Eev. E. T. Lowe. 



Obs. H. lacteal^ MiilL, amnis, sed nisi fallor vere distincta. 

 Differt testa multo minore, ad apicem magis obtusa, omnino 

 levius decussatim sculpturata; anfractibus minus numerosis; 

 apertura minore, antice minus desiliente, intus super parietem 

 ventralem breviter plicato-sulcato ; peristomate multo minus 

 expanso minusque recurvo, margine basali bisinuatim inaequali 

 aut in medio obtuse tuberculatim gibboso. Necnon in colore 

 omnino ab H. lacted discedit ; sc. testa suffuse subcarneo- et 

 sublivido-tincta (quasi subconcolor), solum in regione umbilicali 

 et extus aperturam infuscate flavescenti-grisea, fasciis obsoletis- 

 simis (rmllo modo albo-irroratis) obscure ornata. 



The two examples from which the above diagnosis has been 

 compiled were given to Mr. Lowe, in 1861, from the collection 

 of Senhor Vargas, and as having been taken undoubtedly ' in 

 the north of Teneriffe,' but as to the exact spot he had no note. 

 And indeed this locality (if really to be depended upon) might of 

 itself have created a suspicion, had there been any doubt on the 

 subject, that the species is truly distinct from the H. lactea, 

 which, so far as Teneriffe is concerned, seems to be confined 

 to the vicinity of Sta. Cruz. But, in point of fact, I think there 

 can be no question about its specific claims; although it is 



z 2 



