96 TEST ACE A ATLANTIC A. 



common in many of the calcareous deposits, where I believe 

 that it was first met with by myself. 



The H. psammophora belongs to the same type as the 

 phlebophora, from which however it differs in its somewhat 

 smaller size and more elevated spire, in its basal volution being 

 a little more deflexed at the aperture (which is just appreciably 

 rounder), and 'in its entire surface being (instead of coarsely 

 malleated and confidently costate-striate) densely crowded with 

 large granules, which are elegantly arranged (not exactly on 

 ridges, but) in oblique irregular rows. 



In general size and contour the H. psammophora has more 

 in common with the ' var. 8. craticulata ' (which was detected 

 by myself on the Ilheo de Ferro) than with any other form of 

 the H. phlebophora ; nevertheless its totally different sculpture 

 (the 8. craticulata being quite free from granules, and even 

 more malleated than the ordinary type) will at once separate it. 



Helix phlebophora. 



Helix phlebophora, Lowe, Cambr. Phil. S. Trans, iv. 41. t. 



5. f. 6 (1831) 



nivosa, Pfeiff., Mon. Hel. i. 192 (1848) 

 phlebophora, a. chlorata, Lowe, Proc. Zool. Soc. 



Lond. 166 (1854) 

 Alb., Mai. Mad. 49. t. 13. f. 7, 8 



(1854) 



Paiva, Mon. Moll. Mad. 15 (1867) 



var. 0. planata. 



Helix phlebophora, /3. planata, Lowe, Proc. Zool. Soc. Lond. 



166 (1854) 

 (pars), Alb., Mai. Mad. 49. t. 13. f. 9, 



10 (1854) 

 var. 7. nivosa [pallida, immaculata]. 



Helix nivosa, Sow., Zool. Journ. i. 56. t. 3. f. 3 (1824) 

 phlebophora, 7. decolorata, Lowe, Proc. Zool. Soc. 



Lond. 166 (1854) 

 var. S. craticulata. 



Helix craticulata, Lowe, Ann. Nat. Hist. ix. 113 (1852) 

 nivosa, var. 0., Pfeiff., Mon. Hel. iii. 148 (1853) 

 phlebophora, 8. scrobiculata, Lowe, Proc. Zool. Soc. 



Lond. 166 (1854) 

 var. 0., Alb., Mai. Mad. 49. t. 13. f. 1 1, 



12 (1854) 



var. a., Paiva, Mon. Moll. Mad. 15 



(1867) 



Habitat Portum Sanctum, insulasque parvas adjacentes ; 



