356 TEST ACE A ATLANTIC A. 



It is to Grand Canary that this Helix appears to be pe- 

 culiar, it having been taken by Mr. Lowe and myself in many 

 remote spots both in the interior and south of that island. We 

 met with it in abundance at the head of the Barranco leading 

 down to Aldea de San Nicolas from Mogan ; but we had previ- 

 ously taken it, more sparingly, at Mogan itself, as well as in the 

 lofty Final of Tarajana (above San Bartolome), and even so low 

 down as at Maspalomas and Arguineguin. On the northern 

 side of the island we did not observe it ; but Mousson records 

 its detection by Fritsch near Las Palmas. In the calcareous 

 region between Aldea de San Nicolas and Lagaete, we found it 

 subfossilized. 



In proportion to its size (for the larger examples measure so 

 much as an inch across their widest part), the H. psathyra is a 

 rather thin and fragile shell, with the umbilicus completely 

 closed over, and the peristome (although acute) greatly expanded 

 and recurved. It is slightly shining above, and brilliantly po- 

 lished in the central area below, where, moreover, it is of a 

 much paler olivaceous-yellow. Its upper region is of a pale 

 olivaceous-brown, with a slightly livid tinge (sometimes the 

 green and sometimes the yellow predominating), the outside of 

 the aperture being flavescent ; and there are very obscure traces 

 of four or five obsolete darker bands ; and its sculpture is very 

 light, consisting only of fine irregular oblique lines of growth 

 (free from granules, except at the nucleus), mixed up with faint 

 malleations. 



Helix Gaudryi. 



? Helix Gaudryi, d'Orb., in W. et B. Hist. 57. t. 3. f. 15-17 



(1839) 

 ? Pfeiff., Mon. Hel. iv. 231 (1859) 



Mouss., Faun. Mai. des Can. 98. pi. 5. f. 



16, 17 (1872) 

 ? Pfeiff., Mon. Hel. vii. 347 (1876) 



Habitat Canariam Grandem ; in intermediis, praecipue per re- 

 gionem El Monte dictam necnon in Caldeira magna montis 

 Bandama, degens. 



The H. Gaudryi (at any rate as understood by Mousson^ 

 though not, apparently, as accepted by Pfeiffer) would seem to 

 be peculiar to the intermediate districts of Grand Canary, 

 where, throughout the region of El Monte (particularly about 

 Los Laurealos, and within the great crater of the Bandama 

 mountain) it is by no means uncommon ; and I have taken it 

 above San Mateo, on the ascent to the Koca del Soucilho. It 

 was met with in much the same localities by Mr. Lowe like- 

 wise ; and Mousson records that it was also obtained in Grand 



