THE NAUTILUS. 139 
Melampus flavus Gmel. Not common. 
Limnea humilis Say. Common in fresh water ponds on Anastasia 
Island. 
Physa pomilia Conr. Common with the above species. 
Physa heterostropha Say. Some young specimens evidently this 
species, from Tocoi St. John’s River. 
» Planorbis tumidus Pfr. Common in ponds on Anastasia Island. 
Planorbis dilatatus Gld. A few specimens near St. Mark’s pond. 
Aneylus (Acroloxus) filosus Conr. Common in a swamp near 
Matanzas. 
Ancylus sp.? At Tocoi on the St. John’s River. 
Siphonaria lineolata d’Orb. Common on the old light house rocks. 
OL 
HELIX HORTENSIS IN AMERICA. 
BY T. D. A. COCKERELL. 
There seems to be a prevalent opinion that this species does not 
belong to America at all, but was introduced, like H. nemoralis. 
This idea, however, is surely without foundation, and Mr. W. G. 
Binney tells me that he regards the species as naturally present in 
America. The distribution, though, is curious, and half suggests the 
idea (which I believe is without reasonable foundation) that the 
hardy Norsemen of old may have carried the snail about for food, 
and so imported it where they went. At all events, it frequents the 
places they visited. Starting with New England, the species goes 
north to Canada, Labrador and Greenland. It appears also in 
Iceland, and a small variety occurs in the Shetland Is., * and so we 
come to the continent of Europe, where it abounds. 
H. hortensis is readily known from H. nemoralis, when ordinary 
characters fail, by the shape of its “dart.” It is also less variable 
than nemoralis. I have examined specimens of the following 
varieties, collected in America :— 
(1.) Helix hortensis var. vallotia Moq. 
There is an example of this variety from Labrador in the British 
Museum. 
1 The Shetland form was first named var. zaza, but not described. It is now 
known as var. minor Jeffreys. 
