292 JOURNAL OF CONCHOLOGY,. VOL. lO, NO. lO, APRIL, I903. 



and var. charpentieri Dum. As definite localities for this form in 

 Guernsey, we may give Cobo, Ivy Castle, Moulin Huet, Grande Mare 

 and L'Echelle mill-pond 



Var. virescens Mor. — Guernsey ; identified by Mr. J. VV. Taylor 

 among some shells sent by us many years ago, but the exact locality 

 was unfortunately not noted. 



S. elegans Risso. — Guernsey, at Grosse Hougue Quarry, Ivy 

 Castle, Bon Repos, and Albecq ; specimens approaching var. longi- 

 scala Mor. at Moulin Huet. Longy Pond, Alderney, scarce. 



S. oblonga Drap. — Jersey (Marshall), seey. Conch., vol. 7, p. 414. 



Carychium minimum Miill. — In suitable places in Jersey, 

 Guernsey, and Alderney, often abundant. 



Planorbis lineatus Walker. — Jersey (Duprey). Guernsey (Lukis). 



P. nautileus L. — Jersey (Duprey). Very common in a few ditches 

 on the Vale Road, Guernsey ; one specimen with the last whorl dis- 

 united. Abundant in Longy Pond, Alderney. 



Var. crista L. — With type in Guernsey and Alderney, plentiful, 

 but not very well marked. 



P. albus Mull. — Jersey (Duprey & Cooper). 



P. spirorbis Miill. — Jersey (Duprey). A common species in 

 Guernsey, but not seen in the smaller islands. 



Var. ecarinatus Jeffr. — Very characteristic specimens of this 

 scarce form were found in a ditch on the Vale Road, Guernsey, in 

 1884 (y! Conch., vol. 4, p. 272). Also plentiful in a quarry pool, at 

 Spur Point, St. Sampson's, and at Cobo. 



P. vortex L.— Guernsey, local; marshes near Ivy Castle, and in 

 the Vrangue mill-pond. A specimen from the former locality measures 

 9 mm. in diameter, the average of the species being 5"5 mm. 



[Two other species of Pla?iorbis occur in Guernsey, but they are 

 not indigenous. P. corneus thrives in a small fish-pond at St. 

 George, where they were introduced some twenty years ago by the 

 proprietor ; and P. parvus used to be found plentifully in an arti- 

 ficial pond in a garden at Ruettes Brayes, in which water-plants of 

 many kinds, British and foreign, were grown. The latter species may 

 possibly spread to other parts of the island]. 



Physa hypnorum L. — Jersey (Duprey & Cooper). Guernsey, 

 generally distributed throughout the low-lying districts, and in some 

 pools abundant. 



Limnaea peregra Miill. — Of universal occurrence in ponds, 

 streams, etc., in Jersey and Guernsey ; apparently absent in Sark. 

 At Longy Pond, Alderney, there is found in abundance a very small 

 dark-coloured form which does not correspond with any described 

 variety we know of. 



