820 TESTA CE A ATLANTIC A. 



Hyalina lenis. 



Zonites lenis, Shuttl, Bern. Mitth. 138 (1852) 

 „ „ Pfeiff., Mo, i. lid. iii. 86 (1853) 

 Hyalina lenis, Mouss., Faun. Mai. des Can. 1 6. pi. 1 . f. 19- 



21 (1872) 

 Helix lenis, Pfeiff., Mon. Hel. vii. 145 (1876) 



Habitat Palmam et Hierro ; in sylvatiois editioribus degens. 



The present trnly indigenous Hyalina has been observed 

 hitherto only in Palma and Hierro, where it occurs in damp 

 sylvan spots of an intermediate and lofty altitude. It was taken 

 by Mr. Lowe and myself in the Earranco de Gralga, the Barranco 

 de Agua, and at El Monte above Barlovento, as well as by the 

 edges of the Vueltas leading up to the Cumbre above Buenavista, 

 of the former, and in the wooded district of El Golfo, on the 

 western slopes of the latter. 



The H. lenis is generally of a clear olivaceous brown ; but 

 it has likewise a paler (though scarcely perhaps an ' albino ') 

 state, of a somewhat greenish white. It is, on the average, 

 nearly as large as the H. cellaria, — from which, however, it 

 differs (apart from colour) in its being less shining, particularly 

 on the uppei^-side, and more strongly sculptured (the entire 

 surface being densely covered with oblique, curved, subconfluent 

 hair-like transverse lines, or costae), as well as in its spire 

 being rather less depressed and its umbilicus a little larger. 

 Its ultimate volution is a good deal developed, but scarcely 

 more so (I think) than in the H. cellaria, and certainly not 

 more so than in the Grand-Canarian examples of the latter. As 

 I have already stated under the H. circumsessa, it is not 

 difficult to detect, in occasional examples of the H. lenis, faint 

 traces, beneath a high magnifying power, of the minute spiral 

 lines which are so easily to be seen in the closely allied H. 

 osoriensis, and which are exceedingly conspicuous in the //. 

 circumsessa. 



(§ Lurilla, Lowe.) 



Hyalina cellaria. 



Helix cellaria, Mull., Hist. Verm. ii. 28 (1774) 



„ „ Webb et Berth., Ann. d. Sc. Nat. xxviii. syn. 



314(1833) ' 

 „ „ $Orb.,in W. et B. 59 (1854) 

 „ „ Lowe, Proc. Zool. Soc. Lond. 177 (1854) 

 „ „ Albers, Mai. Mad. 17 (1854) 

 „ „ Paiva, Mon. Moll. Mad. 21 (1867) 

 Hyalina cellaria et canaria?, Mouss., Faun. Mai. des Can. 



15, 16 (1872) 



