CANARIAN GROUP. 331 



de ses tours, s'elevant a 9, et la largeur de I'ombilic elle se 

 presente comme im developpement extreme du type de la rotun- 

 data, Miill.' 



(§ Pyraviichila, Fitz.) 



Patula placida. 



Helix pusilla (pars), Loive., Gamhr. Phil. S. Trans, iv. 46 

 (1831) 

 „ placida, Shuttl., Bern. Mitth. 140 (1852) 

 „ Pfeiff., Mon. Hel. iii. 82 (1 853) 

 „ pusilla, /3. sericina, Loiue, Proc. Zool. Soc. Lond. 176 



(1854) 

 „ Luseana, Paiva, Mon. Moll. Mad. 83. t. 2. f. 3. 

 (1867) 

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



f. 9-12 (1872) 

 Helix placida, Pfeiff., Mon. Hel. vii. 139 (1876) 



Habitat TenerifFam, Palmam, et Hierro ; in sylvaticis edi- 

 tioribus, passim. 



As I have already stated, at p. 87 of this volume, the present 

 minute Patula formed a portion of Mr. Lowe's original H. 

 'pusilla, but it was not until 1 854 that he recognized it to be 

 so far distinct as to define it as a ' var. /S. sericina ' of the 

 latter. In the meanwhile however it had been described by 

 Shuttleworth, from the Canaries, under the title H. placida. 

 The exact characters which separate it from the pusilla have 

 been fully pointed out. 



The P. placida would seem to occur in precisely similar 

 situations throughout the Canarian archipelago as it does at 

 Madeira, its normal range being within the wooded districts of 

 intermediate altitudes. I have taken it at Las Mercedas in 

 Teneriffe, in the Barranco de Agua and the Barranco de Gralga 

 in Palma (where it was found also by Mr. Lowe at El Monte, 

 above Barlovento), and in the sylvan region of El Grolfo on the 

 western slopes of Hierro. It appears also to have been found 

 in Teneriffe (namely on the trunks of trees at Gruimar) by 

 Blauner. 



(§ Acanthinula, Beck.) 



Patula pusilla. 



Helix pusilla, Lowe, Cambr. Phil. S. Trans, iv. 46. t. 5, 

 f. 17 (1831) 

 „ „ Pfeif., Mon. Hel. i. 101 (1848) 

 „ servilis, Shuttl., Bern. Mitth. 140 (1852) 

 „ Pfeif., Mon. Hel. iii. 101 (1853) 



