258 



1. Turt. D. p. 196. Somewhat oval, not much 

 pointed; whorls four, the first occupying three-fourths 

 of the shell, tumid in the middle, lulvous or dark pur- 

 ple with eleven spiral circular shape ridges (often 

 white or greenish black) which reflect a little upwards 

 (the middle are the stronger) ; aperture dark purple or 

 chocolate brown ; lip thin, pillar broad, polished cho- 

 colate. 0,37. ...0,25. Common. At the advice of an 

 eminent Conchologist I have retained this shell as a 

 species, although considered by Fleming, &c. as the 

 young of Rudis, an opinion which 1 am inclined to 

 assent to. 



L. ANATINA. Gray Turt. p. 87. PALUDINA A. 

 Drap. Alder in Mag. Z. fy Bot. 2. p. 116. Ovate, 

 perforated, thin, transparent ; whorls ventricose, rounded 

 and the mouth ovate ; operculum horny and brown. 

 Resembles Bithinia (Paludina) Ventricosa, but is 

 smaller and shorter and has a spiral and horny oper- 

 culum ; the peristome is contiiguous and the shell 

 generally covered with green Algce. 



L.SAXATILIS Johnston in Berw. Tr. 3. p. 268. 

 Macg. Aberd,p. 138. Subglobose-conical, as broad 

 as long, moderately thick, banded or tesselated with 

 dusky brown or green ; whorls three, transversely 



