70 



LAND AND FRESH-WATER SHELLS. 



colour ; whorls five, convex, the body-whorl very large ; spire 

 raised and sharp at its apex ; mouth large, oval, more than half 

 the length of the shell. Length i to i inch. Stagnant waters 

 and slow running streams. Common. L. peregraP 



(d) Shell globosely ovate, glossy, yellowish -horn coloured, semi- 

 transparent ; whorls four to five, the last one very much swollen 

 and occupying fths of the shell ; spire short, acute ; mouth roundish 

 oval, vastly expanded, oblique. Length i inch. Lakes, ponds, 

 canals, marshes, and sluggish rivers. Moderately local. 



L. attricitlana}^ 



(e) Shell elongated, ovate, oblong, thin, greyish-white, horn or 

 brown-coloured ; whorls six to eight, striated in line of growth, 



Fig. 28. — Linincea stagnalis. 



^- V. Inhiosa, smaller, outer lip remarkably expanded and reflected; v. 

 ovata, ampullaceous, glossy, whorls very convex, spire acute and very short, 

 suture deep, aperture obliquely produced, fths the length of the shell ; v. 

 acuminata, resembling v. ovata but has the spire more produced and the mouth 

 smaller ; v. Burnetii, spire exceedingly short, nearly truncate, intorted ; v. 

 nitida, larger, slightly transparent, fauve, coloured ; v. solemia, ventricose, 

 whorls rounded, spire short, fauve, subtransparent ; v. sticcinecrformis, shaped 

 like a succinea, whorls four; v. intermedia, rather compressed towards front 

 margin, thinner, spire more produced, mouth expanded. 



^ v. albida, smaller, thinner, white, spire shorter, stri.x less distinct ; v. 

 rejlexa^ outer lip much reflected ; v. magna, larger, aperture narrower, outer 



