44 



AMERICAN JOURNAL 



Doubtful Species. 



1. LlMAX CINEREO-IMMACULATUS, Olafs., 1, p. 612. 



West Iceland; common. (Olafs.) 



2. Limax agrestis, Brekku Swigill. Common everywhere. 



It is used for medicine, called Sniglavatn, (snail water), for 

 external use, for wounds, warts, etc. Olafs. 2, p. 715. Limax 

 agrestis is common in the gardens. (Mohr. p. 115). I cannot 

 decide if these species are the above named. 



3. Helix stagnalis, L. Very common, but small. (Mohr. 



p. 138.) 



Perhaps L. truncatula. 



4. Helix auricularia, L., is found very large, but thin, by 



Myvatn, where a great number were lying on the shore. 

 It is found frequently at other places, but several times 

 smaller. (Mohr. p. 138.) 



5. Tellina cornea, L., S. N. ed. xii, p. 1120. 



T. magnitudine pisi, rudio, cornu caloris ; ut in Islandia qua- 

 druplo major, L. This is perhaps Sphasrium rivicola, Leach, but 

 no Cyclas is yet found in Iceland ; perhaps it is an error like 

 Buceinum cingulatum, L.,* Mantis, stated to be from Iceland. 



Olafsen seems, however, to describe a Sphcerium in the follow- 

 ing manner, p. 1019, A : 



Concha bivalvis, t. ovata oblonga planiuscula. It is very like 

 to Ader (Mytilus) and agrees with Fauna Svec. 1332, (Mgtilus 

 anatinus) ; but it is flatter, and exceedingly small. The length 

 is half an inch ; the shell is very thin and fragile. 



Tellina lacustris, Mohr., p. 128. 



Prof. Steenstrup feels convinced that none of the above named 

 species are introduced by man, as they nearly all are found far 

 from inhabited places. The fresh-water shells of course cannot 

 be introduced by man. 



All the enumerated species are found as far south as the Alps. 

 It is a remarkable feature that the same species are found in 

 Norway, northern Sweden, in Finland and probably Siberia, 

 countries which all have a colder winter than Iceland. 



The Icelandic species are found associated in the South of 

 Europe with generally three or four closely allied species, which 



* Purpura cingulata, L., Desh. P. trochlea, Lam., from Cape of Good 

 Hope. It is not Trichotropis. 



