The Shell-Collector’s Handbook. 73 
LIMNZA GLUTINOSA, MULL. 
SHELL semi-globular, thin, transparent, amber or yellowish 
horn-coloured; whorls three to four, inflated, the last 
forming nearly the whole of the shell; spire slightly pro- 
duced ; suture rather deep; mouth oval; columellar fold 
curved, and sharp. Length of shell ch. Animal of a 
pale, dull yellow colour, sprinkled with bright brimstone 
or whitish spots ; mantle partly covering the shell. 
Habitat.—Ditches, ponds, and lakes. 
v. mucronata (Jeff.): Shell not quite so globular; 
spire more produced. 
m. intortum (7. D. A. Cockerell) : Spire very short and 
sunken, but slightly raised at the apex; body whorl 
swollen above. (Vide fig. 4.) 
Fic. 4.—Z. Glutinosa. m. intortum. 
LIMNAAA INVOLUTA, THOMPSON. 
SHELL ovate, subglobose, thin, fragile, transparent, glossy, 
pale amber-colour; whorls three to four, convex, body 
whorl occupying the greatest portion of the shell; spire 
sunk within the last whorl; suture distinct, shallow; 
mouth pyriform, large; inner lip broadly spread on the 
penultimate whorl; columellar fold sharp, narrow. Maxi- 
mum length 53 lines; maximum breadth 33 lines. 
Animal dark yellowish-brown, marked with flake-white 
specks at the sides of the head, tentacles, and foot. 
Habitat—A small alpine lake on Cromaglaun Mountain, 
Killarney, Ireland. 
LIMNAA PEREGRA MULL. 
SHELL oval, last whorl ventricose, thin, spirally striate, 
