GASTEROPODA. LIMNAD2. 10 
Whorls faintly striated transversely. Epidermis sometimes 
brownish. 
Gulnaria peregra is extremely common in every part of Great 
Britain, inhabiting slowly running waters, lakes, ponds, and 
marshes. It varies much in size: this has induced Montagu 
and Draparnaud to divide it into three supposed species, which 
gradually pass into each other. 
2. GULNARIA LACUSTRIS. 
G. testa ampullacea, corned ; anfractibus transversim laté-sul- 
catis ; spira depressiuscula ; apertura subovalli. 
Habitat in Angliz Borealis lacubus, vulgaris. 
Shell ampullaceous, horny ; whorls with broad transverse 
regular grooves ; spire depressed ; aperture nearly oval. 
For this species I am indebted to General Bingham, whe 
observed it in all the lakes of Westmoreland and Cumberland 
in tolerable plenty. The regularity of the grooves at once di- 
stinguish this from any other species. The shell is rather thick, 
especially at the apex of the spire, where it is generally decor- 
ticated and eroded. 
3. GULNARIA AURICULARIA. 
G. testa ampullacea, cornea ; apertura amplissima, subpatula. 
Helix auricularia, Linn. Syst. Nat. 1250; Mont. Test. Brit. 
375. t. 16. fig. 2; Penn. Brit. Zool. iv. 139. t. 86. fig. 138 ; 
M. & R. Trans. Linn. Soe. viti. 221. var. a.; Dill. Desc. 
Cat. 969; Turt. Conch. Dict. 68. 
Buceinum Auricula, Mill. Hist. Verm. 322. 
Limneus auricularius, Drap. Hist. des Moll. 49. pl. 2. figs. 2&, 
29; Féruss. Essai Conch. 56. 
Lymnea auricularia, Flem. Edinb. Encyel. vii. 77. 
Animal testaceum, fulvescens aut griseum albo opaco puncta- 
tum. Tentacula dilutiora. Pallium atrum griseo pulcher- 
rimé maculatum et marmoratum. 
Habitat in aquis lenté fluentibus. 
Shell ampullaceous, horny ; the aperture very large, and 
rather spreading. Longitudinal diameter of the aperture one 
inch ; breadth five-eighths. 
