730 



A. E. Verrill — The Bermuda Islands. 



b. — Introduced Snails. 



Figures 75, a, b, c ; 76, a, b ; 79e. 



The " fyriral Snail." (Rumina decollata (L.). 



On account of its great abundance and the damage that it does to 

 the crops, the " spiral snail " is the most important species. This 

 appears to have been accidentally introduced by Governor Lefroy, 



Figures 75, a, b, c. — Spiral Snail (Rumina decollata); xl|; a, adult, ordinary 

 form ; b, adult example, still retaining most of the apical whorls ; c, a young 

 shell with perfect apex. Figures 75, d, e, f. — Polygijra ajjpressa, showing 

 variations ; x l£. 



with growing plants from Teneriffe, in 1876. A single specimen 

 was found in that year by J. M. Jones, in the garden at Mt. Lang- 

 ton.* A few other specimens were found, from time to time, in and 

 about Hamilton and in Paget Parish from 1877 to 1881, when it 

 was still rare and local : in 1882 it was common in some localities. 

 Soon after this it began to spread rapidl}' over the Main Island in all 

 directions, but most rapidly along the principal highways. By 1890 



* The Yale University Library now owns the copy of the Memorials of Ber- 

 muda presented to J. M. Jones by Governor Lefroy. Inserted on the fly leaves 

 is an autograph letter from Lefroy to Jones, dated October 13, 1877, after leav- 

 ing Bermuda, in which he mentions finding a second specimen of this snail in 

 the garden at Mt. Langton, in 1877. In this letter he also refers to the "large 

 slugs " (probably Veronicella Sehivelya?), as abundant in the garden of Mr. 

 French. The first specimen of Rumina, found by Jones in 1876, is recorded in 

 the Essay, No. 3, by Mr. Morris A. M. Frith, who quotes a letter from Mr. Jones 

 in regard to it. But the earliest printed record of the species is by J. T. Bar- 

 tram, in his List of Bermuda Shells, printed in the Bermuda Almanac for 1878. 

 It is not in his list for 1877. 



