The Shell-Collector’s Handbook. 61 
BYTHINIA TENTACULATA, LINN. 
SHELL ovoid, or of an elongated-ovoid, sometimes sub- 
conoid, rather glossy, thin, solid, subtransparent, yellowish 
horn-coloured ; whorls six, the body whorl large; mouth 
oval, angular behind; umbilicus none; operculum oval, 
thick, angulated above, and closely fitting. Length of 
shell 4 inch; width ths inch. Animal blackish, spotted 
with gold colour ; foot two-lobed in front, narrow and 
subacute behind; tentacles long, setaceous; eyes black, 
large, and sessile. 
Hatitat.—Streams, ditches, and canals. 
v. ventricosa (Menke): Shell more tumid, globular- 
conical in shape, white (= var. a ventricosa, Menke). 
v. excavata (Jeff.): Whorls more rounded, and suture 
much deeper. (B. C., vol. i., p. 61.) 
v. albida (Rimmer): Shell white. 
v. producta (Menke): Shell less tumid, in shape 
an elongated cone. (Drap., fig. 19. Var. 6. producta 
Menke). 
v. rufescens (7. D. A. Cockerell) : Shell red-brown. 
m. decollatum (Jeff.): Upper whorls wanting in half- 
grown and adult specimens; their place being supplied 
by a nearly flat and semi-spiral plate, as in Bulimus 
decollatus. (B. C., vol. i., p. 61). 
BYTHINIA LEACHII, SHEPPARD. 
SHELL conoid, very swollen towards the base, yellowish 
horn-coloured; whorls four to five, very tumid, rounded, 
distinctly separated by a deep suture; mouth nearly 
circular, much less angular behind than in B. tentaculata ; 
