496 II. A. Pilshry — Air-breathing Mollusks of the Bermudas. 



Thysanophora hypolepta ( Shuttl. ; Pils.)- 



Plate LXII, Figures 2a, 2b. 



Helix {Microphysa) hypolepia Shuttl, Pilsbry, Proc. A. N. S. Phila., 1889, p. 82, pi. 

 iii, f. 6, 7, 8. 



This minute species has the size of Zonitoides minusculue, but 

 differs radically from that species in form, especially in the outline 

 of the aperture. It could not certainly be known from Shuttle- 

 worth's note whether he had this species or the broadly umbilicated 

 variety of Z. minusculus, but the tradition preserved on labels by 

 Bland fixes its identity. The species is apparently peculiar to Ber- 

 muda. First recorded by Jones, 1876. It was also recorded by C. 

 B. Adams and T. Bland, but seems to have escaped later collectors. 



Polygyra microdonta (Desh.). 



Plate LXII, Figure 3. 



Found by Robert Swift in 1852, and by all later naturalists who 

 collected land shells. It is distinguished from the Florida wheel- 

 shaped Polygyras by its very much finer striation above. It occurs 

 also in the Bahamas, One of the most abundant Bermudian species. 



It is one of the few species found on Shelter Island and various 

 small uninhabited arid islands. It occurred abundantly under stones 

 on the main island, near the Causeway. — (Cook.) 



Polygyra appressa (Say). 



First recorded from Bermuda by Jones, 1876, and by Bland in 

 1881. It still flourishes there, as the specimens taken by Professor 

 Verrill's party attest. These are rather small (diam." IS-H""") and 

 strongly ribbed, belonging to the var. sculptior Chadw., which 

 ranges from Virginia westward. There cannot be much doubt that 

 the species was imported from the United States. Mr. J. M. Jones, 

 1876, knew it from but one locality, near St. Georges. Now com- 

 mon. 



It was found abundantly in an old stone wall near the Post Office 

 at Bailey Bay. — (Cook.) 



Family ACHATINIDiE. 

 Rumina decoUata (L.). 



This south European species has become extremely abundant over 

 the cultivated portion of the main island, doing damage to fruit and 

 vegetables. It was first reported from the island in 1888. It was 

 not recorded by Jones in 1876. 



