SIKES : NON-MARIXE MOI.LUSCA OF ICELAND. 



and about one-third of this consists of shale and Hgnite, together with 

 indurated moraines, claystones with glacial and interglacial shells, and 

 fluviatile and lacustrine conglomerates. There are many remains of 

 pleistocene volcanoes, while the oldest basalts are probably oligocene. 

 Throughout the island are innumerable hot springs (Laugar) and in 

 the best known ones near Reykjavik I found Limncp.a pereger var. 

 geisericola Beck, living in water so hot that I could only just bear to 

 put my hand in it, and at a distance of about forty feet from the 

 source, where the water bubbles out of the ground at a temperature of 

 250° Fahr. To excuse the apparent unscientific treatment of this 

 phenomenon I must plead in defence that I took a thermometer down 

 with me which shivered into atoms in the hottest water. Alas ! for it 

 was borrowed. As there are now three lists of Icelandic shells, I have 

 thought that a better ' conspectus ' would be gained by putting the 

 results in parallel columns; the "ditto," of course, must be treated 

 horizontally. I owe many sincere thanks to Mr. A. S. Kennard, who, 

 with Mr. Woodward {Pisidia), and Mr. Roebuck (slugs), has verified 

 or altered my conclusions. 



N.B. 



MORCH, 1868. 



A Hon ater (L.). 



Arion cindus Miill. 



Arion horteusis Fer. 

 Li max agrestis (L.). 



=not found. 



Do.^=found. 



WESTERLUND, 1897. SIKES, 1912. 



do. do. var. atra Hafnar- 



fjdrdr (S.). 

 Arion riifus=^\ciX. rufii — 



— Arion std)fusais(V>xviiy.) 



— var. aurantiaca Loc. 

 Reykjavik (S.) 



— var. fniiginea Morelet 

 Hafnarfjordr. 



— Agrioliinax agrestis 



Reykjavik. 



— — var. reticulata Moq.- 



Tand. 

 Limax marginatus (Miill.). do. — 



Vitrina beryl Una Pfr. — — 



— Vitrina angelica Beck. do. common. 

 Hyalinia alliaria Mill. do. do. Hafnarfjdrdr, Isa- 



fjordr (N.W.) 

 Hy.h.ininwnis^^radia- 



titla (Alder) do. do. Akureyri (N.) 



— Conulus fabriciiiWvW.) do. Isafjordr, Seydis- 



fjordr (N.E.). 



