94 HELICEA. 



— the aperture is much hke that of pustula, but moi-e narrow than 

 that of leporina. The inferior tooth on the peristome is more de- 

 veloped laterally than in H. pustida, — indeed it has a somewhat 

 bifid appearance, in which respect it is more allied to II. leporina. 



Tim fulcrum in H. pustuloides is of the same nature as that in 

 H. leporina, but less developed, and with the outer edge entire. 



As to the station of the species, I copy the following from one 

 of his (Dr. Wilson's) interesting letters : — 



" The place has an eastern exposure to the sea, high tides rising 

 to the base of the low bluff where they exist. The growth of trees, 

 which consists mostly of live oak and Celtis occidentalism has never 

 been cleared off; the Palmetto serrulata flourishes as an under- 

 growth. The soil is covered for a few inches in depth with oyster- 

 shells thrown there by the Indians, and decayed leaves and frag- 

 ments of branches are of course over all these, under which, and 

 among the superficial oyster-shells, the Helices live. II. pustula 

 is nowhere near, or at least a rigid search did not reveal any. II. 

 concava (dead) occurs in small numbers. H. injlecta abun- 

 dantly." 



HELIX PUSTULA Ferussac vol. ii. p. 201 (ex parte), pi. Ixxvii. fig. 12. 



T. orbiculato-depressa, tenue striata, anguste umbilicata ; umbilico 

 obtuso ; rufa vel pallida cornea; anfr. angustis, convexiusculis, sutura 

 depressa conjunctis, ultimo basi convexiore prope aperturam defiexo, 

 coarctato : apertura angusta, arcuata, obliqua, alba ; marginibus reflexis, 

 basi dente mediocri, linguiformi, conjunctis; labro bidentato, dentibus 

 approximatis inasqualibus. (Deshayes.) 



SYNONYMS AND EEFERENCES. 



Helix imstula Deshayes in Fer. i. 78. 



1'feiffeh, iii. 268, (excl. /^). 

 Chemnitz, i. 376, (1846). 

 Reeve, Con. Icon. No. 721, (1852). 

 Bland, N. Y. Lye. vi. 846; Notes, 36. 



I have given a fac-simile of Ferussac's figure of this 

 species, there being no correct one in the Mollusks. As 

 already observed, the pustula of Binney is not Ferussac's ; 

 it is pustuloides Bland. It is readily distinguished by its 



