GASTEROPODA. LIMNAD2. 109 
** Animal dirty-yellow, or testaceous; mantle spotted with 
yellow or sulphur-colour.””—Cranch. 
This species is very rare, or at least very local in Britain. It 
is said to be not uncommon in the marshes around Deal. 
Montagu found it in a water-course, near Reading, in Berkshire ; 
in a ditch, near Dunster Castle, in Somerset; it has likewise 
been taken in a pond near Windermere, by the Rev. J. Bulwer. 
It secretes, in common with its congeners, a vast quantity of 
thick mucus; I have therefore rejected the specific appellation 
glutinosa, which is expressed in its generic name, and have 
substituted that of the celebrated Miiller, who first discovered it. 
Genus 48. Puysa. 
Physa, Draparnaud, Férussac, Cuvier. 
Testd ovati; spira subabrupté elevata, ad apicem obtusius- 
eula. Umbilicus nullus. Pallivm \ateraliter in membranam 
multifidam dilatatum, anfractis ultimi latera, et spiram tegens. 
Tentacula setacea. 
Shell ovate, the spire rather abruptly elevated, its apex some- 
what obtuse. Umbilicus none. Mantle dilated laterally into 
a many-parted membrane, which is reflected over the sides and 
dorsal aspect of the last whorl. Tentacula setaceous. 
1. PHyYSA FONTINALIS. 
P. testa diaphana; cornea, nitida ; anfractibus tenuiter trans- 
versim striolatis. 
Bulla fontinalis, Linn. Syst. Nat. xii. 1. 1185; Mont. Test. 
Brit. i. 226; M. & R. Trans. Linn. Soc. viii. 126 ; Flem. 
Edinb. Encycl. vii. 85 ; Dill. Desc. Cat. 487 ; Turt. Conch. 
Dict. 26. 
Planorbis Bulla, Mill. Verm. Hist. 353. 
Bulimus fontinalis, Brug. Encycl. Méth. Vers, 306, 17. 
Physa fontinalis, Drap. Hist. des Moll. 54. pl. 3. figs. 8, 9. 
Animal testaceum, olivaceo-punctulatum et irroratum. Ten- 
tacula et margines pedis testacea, seepius Immaculata. Pes 
elongatus, acuminatus. Oculi aterrimi. 
Habitat in fontibus et in aquis lenté fluentibus. 
