SAINT HELENA. 535 



lines across its broadest part (with an altitude of one line), and 

 having its aperture totally free from plaits or teeth ; and so far 

 as I can gather from the mere description, I should imagine 

 that it must have a good deal in common with that species. 

 Pfeiffer's diagnosis of it is as follows : ' T. umbilicata, depressa, 

 discoidea, tenuiuscula, conferte striata et irregulariter subvari- 

 cosa, vix nitidula, nigro-fusca ; spira plana ; anfr. 4 convexi, 

 sensim accrescentes, ultimus non descendens, subdepresso-rotun- 

 datus ; umbilicus pervius diametri subaequans ; apertura fere 

 diagonalis, lunato-circularis ; perist. simplex, rectum, margini- 

 bus convergentibus, columellari superne vix dilatato.' 



Hyalina cellaria. 



Helix cellaria, Mutt., Hist. Verm. ii. 28 (1774) 



Lowe, Proc. Zool. Soc. Lond. 177 (1854) 

 Albers, Mai. Mad. 17 (1854) 

 Paiva, Mon. Moll. Mad. 21 (1867) 

 Hyalina cellaria, Mouss., Faun. Mai des Can. 15 (1872) 

 Zonites cellarius, Melliss, St. Hel. 120 (1875) 



Habitat in cultis intermediis Sanctse Helena, vulgaris ; ex 

 Europa forsan introducta. 



This common European Hyalina is tolerably abundant in 

 the intermediate districts of St. Helena, where in all probability 

 it has been introduced from England along with consignments of 

 shrubs and plants. We found it pretty general at and around 

 Plantation, and it also ranges up to the central ridge, though 

 less decidedly so than the H. alliaria, which is perhaps more 

 at home in the loftier parts of the island than it is lower down. 



The H. cellaria, owing probably to the easy manner in 

 which it is liable to be transported through indirect human 

 agencies, has become widely distributed, and is well-nigh uni- 

 versal within the cultivated regions of the Azorean, the Madeiran, 

 and the Canarian archipelagos. 



Hyalina alliaria. 



Helix alliaria, Mill., Ann. Phil. (N.S.) vii. 379 (1822) 

 fcetida, Brown, Brit. Shells, t. 40. f. 48-52 

 alliaria, Pfeiff., Mon. Hel. i. 90 (1848) 

 remota, Bens., Ann. Nat. Hist. vii. 263 (1851) 

 Pfeiff., Mon. Hel. iii. 106 (1853) 



Zonites alliarius, Melliss, St. Hel. 120 (1875) 



Habitat in intermediis editioribusque Sanctse Helenae, prse 

 sertim sub ligno putrido et lapidibus humidiusculis, frequens. 

 Ex Europa, nisi fallor, olim introducta. 



