TOMLIN AND MARQUAND : SHELLS OF THE CHANNEL ISLANDS. 293 



Var. ovata Drap. — Guernsey, at Ivy Castle, and near Fort Doyle. 



Var. inflata Kobelt. — Abundant and fine in a mill-pond in Tal- 

 bot's Valley, Guernsey. 



Var. solemia Zgl. — This distinct and much more swollen form 

 occurs at Cobo, Guernsey. It is also known from Preston and South- 

 port, Lancashire. 



Var. intermedia Fer. — Cobo, Guernsey. 



Var. fontinalis Stud. [=var. pulcheUa Garn.]. — Pool towards 

 Grandes Rocques, Guernsey, scarce. 



Var. maritima Jeffr. — According to Messrs. Cooke & Gwatkin 

 this form is widely distributed, but we have only found characteristic 

 specimens in a small tank in Herm, the shell being very solid, small, 

 with a large mouth. The race varied considerably in four consecutive 

 years (1884-7), ^^'''^ the last lot, procured in 1887, are apparently 

 tending towards a dwarf form of the type, with quite thin shells. 



L. palustris Miill. — Not uncommon throughout the northern half 

 of Guernsey, especially about the Vale, where the form is rather 

 stumpy and deeply-coloured inside, being perhaps referable to var. 

 tincta Jeffr. 



Monst. decollatum Jeffr. — Guernsey (Lukis). 

 L. truncatula Miill. — Jersey, Guernsey, and Alderney, not un- 

 common in suitable places. 



Var. elegans Jeffr. — Grande Mare, Guernsey, very fine. 



Var. minor Moq. — Saints' Bay Valley, Guernsey. 

 L. glabra Miill — Jersey (Duprey). Guernsey, common in 1877 in 

 ditches near Ivy Castle (Cooke & Gwatkin). In 1884 this locality 

 was searched in company with Professor Gwatkin, and again on sub- 

 sequent occasions, but no trace of L. glabra was discoverable. It 

 seems to have entirely died out in that station, and possibly the species 

 is now extinct in Guernsey. 



Var. elongata Jeffr. — Jersey, living with the type, but having a 

 blunter apex (Duprey). 



Ancylus fluviatilis Miill. — Jersey, Guernsey and Alderney, com- 

 mon in streamlets. Port du Moulin, Sark (Cooke & Gwatkin). Mr. 

 Duprey has more than once found it in Jersey, attached to the active 

 flying water-beetle, Acilius sulcaius, thus showing how a slow, seden- 

 tary mollusc may be quickly distributed over the country. 



Var. gibbosa Bourg. — Sark (Jeffreys). 



Var. albida Jeffr. — Guernsey, scarce in a spring at Fermain ; 

 plentiful under a small waterfall at Bon Repos. 



A. lacustris L. — 'Marshes near Ivy Castle, (Guernsey (Cooke &i. 

 Gwatkin). 



