332 TESTACEA ATLANTIC A. 



Helix pusilla, a. ammlata, Lowe, Proc. Zool. Soc. Lond. 176 



(1854) 



Alb., Mai Mad. 18. t. 2. f. 7-10 (1854) 

 Pawa 9 Mon. Moll. Mad. 79 (1867) 

 hypocrita, Dohrn, in Mai. Bldtt. xvi. 1 (1869) 



Patula servilis, Mouse., Faun. Mai. des Can. 25. pi. 2. 

 f. 13-16 (1872) 



Habitat Teneriffam, Palmam, et Hierro ; in aridis sub lapi- 

 dibus, minus frequens. 



This extremely minute Patulaseems to possess a wide geogra- 

 phical range, occurring not only in the Madeiran and Canarian 

 archipelagos, but likewise at the Cape Verdes (from whence it 

 was described by Dr. H. Dohrn as the ' P. hypocrita '), and even 

 at St. Helena, where it was detected by myself in 1875. At the 

 Canaries I met with it only in Teneriffe and Hierro (in the 

 former of which islands it was obtained by Mr. Lowe near Grara- 

 chico) ; but it would appear, also, to have been found by Blauner 

 in Palma. 



I have already stated, at p. 89 of the present volume, what 

 the exact characters are which separate the P. pusilla from the 

 placida ; but I will again add that it is (on the average) a 

 little smaller, browner (or less olivaceous), and more depressed 

 (its spire being less raised), and that its volutions ' (which are 

 a trifle less inflated) have a greater or less tendency to be fur- 

 nished with a few additional, elevated, hair-like lines, or costse, 

 which, although at times scarcely distinguishable, are more 

 often (when viewed beneath a high magnifying power) quite 

 conspicuous. 



Patula spinifera. 



Patula spinifera, Mouss., Faun. Mai. des Can. 25. pi. 2. 



f. 17-20 (1872) 

 Helix spinifera, Pfei/., Mon. Hel. vii. 85 (1876) 



Habitat Canariam Grandem, et Palmam ; in sylvaticis edi- 

 tioribus, rarissima. 



This remarkable little Patula appears to be one of the 

 rarest of the Land-Shells of the Canarian archipelago, where 

 it occurs in the damp sylvan districts of intermediate and lofty 

 elevations. I took a single- specimen of it in Grand Canary (the 

 first, I believe, which has been recorded from that island) ; and 

 a few more were met with by Mr. Lowe and myself in the Bar- 

 ranco de Agua and the Barranco de Gralga, as well as on the 

 Cumbre above Buenavista, of Palma. 



In its rather larger size and turbinate, Helix-shaped out- 

 line, the P. spinifera (which belongs to much the same type as 



