494 TEST ACE A ATLANTIC A. 



portion being more decidedly opake and more regularly and 

 distinctly striated, the costae in the P. Bouvieri being both less 

 evident and more interrupted (and subconfluent), giving a more 

 wrinkled appearance to the surface. 



Patula Bouvieri, 



Helix Bouvieri, Morel., Journ. de Conch, xiii. 235 (1873) 

 Pfeiff., Mon. Hel. vii. 200 (1876) 



Habitat S. Vicente ; in editioribus juxta Monte Verde a DD. 

 Lowe et Bouvier reperta. 



Judging from the published diagnosis, I have little doubt 

 that a single example which is now before me, and which 

 was taken by Mr. Lowe in S. Vicente (on the ascent, I feel 

 almost sure, of Monte Verde), is identical with Morelet's re- 

 cently described H. Bouvieri ; and if this be the case, the ' var. 

 minor ' (from S. Antao) of Dohrn's Patula gorgonarum seems 

 to me to be so unmistakeably related to the Bouvieri that I am 

 exceedingly doubtful whether the latter is more in reality than 

 a mere insular modification of that (S. Antao) species, the 

 Bouvieri proper being apparently a S. Vicente form. Indeed 

 if this individual (to which I have just called attention, and 

 which was obtained by Mr. Lowe in S. Vicente) be absolutely 

 typical of the Bouvieri, and I have every reason to believe that 

 it is, the present Patula may be defined as being smaller, and 

 less keeled, than the gorgonarum, not quite so opake, at any 

 rate on the under region, and with the striae in that part less 

 regular and more interrupted and subconfluent, occasioning 

 the surface to appear, when viewed beneath a high magnifying 

 power, as more wrinkled. 



Although calling to mind some of the members of the 

 sections Hispidella and Gonostoma, amongst the true Helices, 

 I have already implied (vide foot-note on preceding page) why 

 it is that I think it will be more natural to treat these three inti- 

 mately allied species, namely the P. gorgonarum, Bouvieri, 

 and Bertholdiana (the last of which moreover is closely akin to 

 the Canarian P. garachicoensis, which could hardly be looked 

 upon as otherwise than a veritable Patula), as members of the 

 present genus. 



Patula Bertholdiana. 



Helix Bertholdiana, Pfeiff., Mai. Bldtt. 149 (1852) 

 Dohrn, Mai. Bldtt. xvi. 2 (1869) 



Pfeiff., Mon. Hel. vii. 210 (1876) 



Habitat S. Antao, et S. Vicente ; a cl. Dohrn lecta. 



The present shell, which is rather more on the ordinary 



