CANARIAN GROUP. 411 



little more pallid than the rest. Its keel is sharply defined, 

 and is traceable for a short distance up the spire, its suture 

 is strongly marked, its nucleus is rather more prominent than 

 in the H. oleacea ; and it is altogether dull and opake. 



Helix Watsoniana. n. sp. 



T. anguste umbilicata, rotundato-lenticularis, tenuiuscula, 

 calva, subopaca, rufo-brunnea, ubique dense et argute costulato- 

 striata striis plus minus obscure pallidioribus, plagas valde irre- 

 gulares obsoletas hinc inde efficientibus ; spira depressiuscula, 

 anfractibus 5 convexiusculis, lente crescentibus, ultimo vix de- 

 scendente et vix angulato Subtus obscure subfasciato-marmo- 

 rata. Peristomate acuto, labris omnino disjunctis, columellari 

 ad insertionem reflexo, umbilicum parvum subito excavatum 

 paululum tegente. Diam. maj. tin. 2 ; alt. 1 -J-. 



Habitat Canariam Grandem, et Teneriffam. Pauca speci- 

 mina communicavit Revdus. R. B. Watson, cujus in honorem 

 nomen triviale dedi. 



A few examples of this inconspicuous little Helix have been 

 communicated by Mr. Watson, as having been taken in Grand 

 Canary and Teneriffe ; and, although the affinities of the species 

 are not very manifest, I am inclined to think that it has more 

 in common with the H. Woodwardia and oleacea, of the Lem- 

 niscia group, than with the Xerophilous forms around the 

 armillata and conspurcata. Apart froni its small size and 

 rounded, sublenticular outline, the H. Wat&oniana, which seems 

 quite distinct from everything else recorded in the present cata- 

 logue, may be known by the fine but sharp and densely-packed 

 costate-strise with which it is uniformly sculptured, by its rather 

 thin and fragile substance, and by its bald, reddish -brown sur- 

 face being more or less obscurely marbled with very irregular paler 

 dashes or streaks, caused by the colour of the minute hair- 

 like ribs being here and there more or less suffused or confluent. 

 Its umbilicus is small but suddenly excavated, and is partially 

 overhung by the acute but somewhat recurved columellary mar- 

 gin of the peristome. 



Helix caementitia. 



Helix csementitia, ShuttL, Bern. Mitth. 291 (1852) 

 t n Pfeiff; Mon. Hel. iii. 638 (1853) 



Habitat ' Canaries ' (Mus. de Marseille), sec. Shuttleworth. 



I know nothing about this Helix, except that two examples 

 of it are said to be in the Museum at Marseilles, which are 

 labelled as having come from the Canaries,' but from what 



