SAINT HELENA. 541 



Helix pusilla, Pfeiff., Mon. Hel. i. 101 (1848) 

 „ servilis, Shuttl, Bern. Mitth. 140 (1852) 

 „ „ Pfeif., Mon. Hel. iii. 101 (1853) 



„ pusilla, a. annulata, Loive, Proc. ZooL S. Lond. 176 



(1854) 

 „ „ Alb., Mai. Mad. 18. t. 2. f. 7-10 (1854) 



„ hypocrita, Dohrn, Mai. Bldtt. 1 (1869) 

 Patula servilis, Mouss., Faun. Mai. des Can. 25. pi. 2. f. 

 13-16 (1872) 



Habitat in intermediis insulse ; ad Plantation, West Lodge, 

 et Thompson's Wood a meipso copiose lecta. 



This extremely minute Patida (which occurs in the Azorean, 

 Madeiran, Canarian, and Cape-Verde archipelagos) I met with, 

 not vmcommonly, in the intermediate districts of St, Helena, — 

 particularly in the grounds at Plantation, where it is found in 

 damp spots beneath fir-cones and pieces of timber, as well as at 

 West Lodge and Thompson's Wood. It is not unlikely that it 

 may have been originally imported into the island, along 

 perhaps with consignments of shrubs and plants ; though the 

 fact that the latter were introduced chiefly from England and 

 the Cape of Grood Hope, where the P. pusilla has not been 

 ascertained to exist, is against that hypothesis. 



Apart from its very diminutive size (the largest examples 

 measuring scarcely a line across their broadest part), the P. 

 'pusilla may be known by its rounded but flattened contour and 

 large open umbilicus, as well as by its brown and subopake 

 surface being more or less evidently furnished with a few addi- 

 tional, remote, appreciably raised, oblique, thread-like lines, — 

 which, although sometimes so indistinct as to be barely trace- 

 able, are at others considerably developed and conspicuous. Its 

 aperture is quite free from plaits, and its peristome is acute. 



Genus 4. HELIX, Linn. 



(§ Valhniia, Risso.) 



Helix pulchella. 



Helix pulchella, MiilL, Verm. Hist. ii. 30 (1774) 



„ „ Lowe, Cambr. Phil. 8. Trans, iv. 45 (1831) 



„ ,, Alb., Mai. Mad. 45. t. 12. f. 1-4 (1854) 



„ „ Morel., Hist. Nat. des Agor. 175 (1860) 



„ „ Mouss., Faun. Mai. des Can. 61 (1872) 



Habitat prsecipue in intermediis ; ad Plantation, Thomp- 

 son's Wood, Peak Gut, et cset., abundans. Forsan ex alienis (se. 

 Anglia), una cum plantis, olim introducta. 



