330 TEST ACE A ATLANTIC A. 



more open, but which shapes-out at its commencement a peculiar 

 and very distinct circular keel on the under-part of the basal 

 volution. It is also, on the whole, a little darker, or browner, 

 than the rotundata ; and it is less sculptured beneath (at any 

 rate outside the above-mentioned circular keel) with costate 

 lines. 



This would appear to be one of the most local of the Ca- 

 narian Land-shells, and indeed one of the rarest, — the only 

 district in which I am aware that it has hitherto been found 

 being around Gfarachico, in the north of Teneriffe. It was met 

 with there, in 1861, not uncommonly, by Mr. Lowe, — having 

 previously been taken, in the same locality, by Blauner. 



Patula retexta. 



Helix retexta, ShuttL, Bern. Mitth. 139 (18'52) 

 „ „ Pfeiff., 3Ion. Hel Hi. 115 {18 5S) 



Patula retexta, Mouss., Faun. Mai. des Can. 24. pi. 2. 



f. 5-8 (1872) 

 Helix retexta, Pfeiff., vii. 212 (1876) 



Habitat Palmam ; a cl. Blauner sub foliis dejectis lecta. 



This species and the following one are the only Canarian 

 Patulas which I have not myself had an opportunity of ex- 

 amining. Comparing it with the Teneriffan P. engonata, and 

 the P. Guerineana, Lowe, from Madeira, Mousson says {I. c. 

 24) : ' Elle ne presente ni la carene, ni Tangle au pourtour de 

 I'ombilic de la P. engonata ; le dernier tour est plus lisse ; la 

 sutu.re marginee d'une fine ligne blanche. L'espece la plus 

 proche est la P. semiplicata, Pfr. {Guerineana, Lowe) de Ma- 

 dere, mais celle-ci n'a pas de suture marginee, un ombilic encore 

 plus large, des tours plus etroits quoiqu'en nombre egal, et une 

 costulation plus grossiere.' 



The P. retexta^ was taken by Blauner in Palma, where how- 

 ever it was not met with by either Mr. Lowe or myself. 



Patula scutula. 



Helix scutula, ShuttL, Bern. Mitth. 139 (1852) 

 „ „ Pfeiff., Mon. Hel. iii. 108 (1853) 



Patula scutula, Mouss., Faun. Mai. des Can. 24 (1872) 

 Helix scutula, Pfeiff., Mon. Hel. vii. 186 (1876) 



Habitat Teneriffam ; sub ligno emortuo a cl. Blauner bis 

 detecta. 



As already stated, this is one of the few Canarian species 

 which I have not been able to inspect. It appears to have been 

 unknown also to Mousson, who remarks {I. c. 24) : ' Cette 

 espece m'est inconnue. Par sa forme tres deprimee, le nombre 



