730 A. FE. Verrill— The Bermuda Islands. 
b.—Introduced Snails. 
Figures 75, a, b,c; 76, a, b; 79e. 
‘The “ Spiral Snail.” (Rumina decollata (1.). 
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, 6, e.—Spiral Snail (Rumina decollata); x14; a, adult, ordinary 
form ; 6, adult example, still retaining most of the apical whorls; ¢, a young 
shell with perfect apex. Figures 75, d, e, f.—Polygyra appressa, showing 
variations; x 1}. 
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 rapidly 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 Schivelyce), 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. 
