62 THE NAUTILUS. 



one-fifth of a mile from Salt Island, to which one can walk at low 

 tide, only the banded form 12345 and occasionally 10345 could be 

 found. Note that Binney in his second work says, " banded varie- 

 ties are said not to be uncommon." This would indicate that he did 

 not visit the island a second time, and that there is no positive proof 

 that the banded varieties referred to came from there. They were 

 probably found on the near-by promontory. 



At Bass Rocks, one-half mile southwest of Briar Neck, and sepa- 

 rated by a sandy beach, marsh and creek, both the plain and banded 

 forma occur in almost equal numbers. The yellowish-white form, 

 subalbida Locard, comprise about one-half of those classed as plain, 

 the other being the bright yellow form, often with an obsolete brown 

 or translucent band. The banded forms show the following varia- 

 tions : 12345, 123(45), 12045, 00300. After a shower I found 

 these in numbers, but only along the narrow strip of natural growth 

 left between the road and high-water mark. This strip being trav- 

 ersed by a walk, many were crushed under foot by pedestrians. I 

 next visited Emerson Point (" Land's End," Rockport), about two 

 miles northeast of Briar Neck, from which it is separated by Long 

 Beach and a small creek. Here I found both the plain and banded 

 forms, only about 25 per cent., however, being banded. 



It seems quite interesting that in the four localities above men- 

 tioned, the shells from the two nearest together (Salt Island and 

 Briar Neck) show scarcely any variation in their respective stations, 

 while those found on either side are considerably diversified, and 

 that the form subglobosa on Salt Island has undoubtedly remained 

 unchanged since Amos Binney collected it there about eighty years 

 ago. 



During the month of July Dr. J. A. Cushman, while collecting 

 material with Prof. J. S. Kingsley in Casco Bay, Maine, visited a 

 number of the islands and made a very interesting collection of 

 Helix hortensis, adding materially to our knowledge of its distribu- 

 tion. On the western portion of Brown Cow Island, 96 specimens 

 were collected, of which six were banded 12345 ; nine had pale 

 translucent bands v. arenicola, and the remainder were the v. sub- 

 globosa. From the eastern portion of the island the material con- 

 tains 35 v. subglobosa and six banded 12345; among the latter 

 there was a tendency for bands one and two to fuse toward the 



margin. 



