74 THE NAUTILUS 



localities above cited, "the region of Portland, Maine," and also 

 gives the St. Lawrence, ^n 1843 Dr. J. W. Mighels, in his cata- 

 logue of the shells of Maine, 1 refers to H. hortensis as follows : 

 " Captain Walden has recently detected this species on a little i land 

 in Casco Bay. It must be very plentiful as he obtained more than 

 five hundred specimens in a few hours. * * * Most of them have 

 five dark brown bands on a yellow ground ; some four, some two, and 

 a few none. Some have light fawn-colored bands on a white ground ; 

 in others, in place of colored bands the yellow ground is interrupted 

 with nearly transparent zones, one beautiful specimen is hetero- 

 strophed." The latter probably represents the mutation sinistrosum 

 of British authors, and seems to be the only American record. In 

 the same year James E. DeKay a under H. subglobosa says : " I am 

 indebted to Col. Totten of the United States engineers for my ac- 

 quaintance with this species, which he found near the shore of the 

 St. Lawrence, two hundred miles below Quebec." 



In 1851 s Amos Binney adds to his previous remarks on its geo- 

 graphical distribution, as follows : " It is also said to occur in the 

 northern part of Vermont, in Maine, Canada on the St. Lawrence, 

 Nova Scotia, and the islands of St. Pierre and Miquelon." In re- 

 ferring to changes which have taken place he says : " The prevalent 

 characters of this, and probably of other species in a given locality, 

 seem to undergo a considerable change from time to time. When I 

 first visited Salt Island, where the species abounds, ten years ago, 

 it was impossible to find a single specimen with either lines or bands. 

 One uniform color prevailed throughout. At the present time the 

 banded varieties are said to be not uncommon." To this Dr. Gould 

 appends the following note : " They have recently been discovered 

 by Dr. Samuel Cabot, in great numbers, on House Island, another 

 of the little islets in the vicinity of Cape Ann, where all of them are 

 of the banded variety. On the Outer Gooseberry, another neighbor- 

 ing islet, he found still another variety. 



Mr. Samuel Tufts, Jr., in " A List of Shells Collected at Swamp- 

 scot, Lynn and Vicinity" (Proc. Essex Inst., I, p. 32, 1853), says : 



1 Boston Journal of Natural History, IV, p. 332, 1843. 

 'Natural History of New York, Mollusca, Pt. V, p. 32, 1843. 

 * The Terrestrial Air-breathing Mollusks of the United States (edited by A. 

 A. Gould), II, p. 112, 1851. 



