20 Moll. 
MOLLU8CA. 
p. 343. Clausilia laminata; H. Pollard, Naturalist, iv. p. 170. Clausilia 
rugosa ; Nelson, J. of Conch, ii. p. 185. Clausilia biplicata and Pupa 
doliolum; Hesse, 1. c. p. 95. Ancylus fluviatilis^ small colony ; Nelson, 
J. of Conch, ii. p. 282. Several other examples ; Brot, Proc. verb. Soc. 
mal. Belg. vi. [1877] p. xlviii. 
Flanorbis corneus. Specimens of a bright flesh or pink colour in the 
animal, and with thin diaphanous shell, found near Leeds ; W. Nelson, 
J. of Conch, ii. p. 150. 
Albino, melanotic, and yellow varieties observed in 49, 15, and 12 
species of marine shells of the Mediterranean, in specimens found in 
sponges ; A. de Monterosato, Bull. Soc. mal. Ital. v. pp. 231-233. 
Some remarkable deformities in Helix^ Clausilia, and Pupa, incomplete 
repair of fractured shell in Helix and Clausilia, abnormal narrowness or 
bending of some of the first whorls in Clausilia, &c., described, and most 
of them figured by P. Hesse, JB. zool. sect. Westf. Mus. 1879, pp. 96-98, 
pi. ii. figs 5-10. 
Specimen of Clausilia dubia (Dr.) with abnormal second aperture 
described ; Bottger, JB. mal. Ges. vi. pp. 98-101, pi. ii. fig. 2. 
Deformities of Limncea limosa (L.), Physa acuta (Dr.), and Planorbis 
paladilhi from a lake of brackish water in the Landes, chiefly caused by 
interruption of growth ; Polin, Faune lacustre de P ancien lac d^ Ossegor, 
J. de Conch, xxv. p. 185, 2 pis. ; abstract, JB. mal. Ges. vi. pp. 190 & 191. 
Deformity of Limncea peregra at the base of the columella, caused by 
Hydra viridis ; Brot, Proc. verb. Soc. mal. Belg. vi. [1877] p. xlviii. 
Keeled deformity of Limncea limosa (L.) from Northumberland; J. 
PuRVES, tom. cit. p. xlvii., with woodcut. 
Deformity of Cardium edule (L.), in which the ribs are dislocated pro- 
bably by a former damage ; Martens, SB. nat. Fr. 1879, p. 74. 
Malformed teeth in the radula of [Helix^ Leptaxis iindata (Lowe) ; 
Binney, Bull. Mus. C. Z. v. p. 337, pi. i. fig. e. 
Abnormal outgrowth on the edge of the shell in Mactra solidissima ; 
Leidy, P. Ac. Philad. 1879, p. 198. 
J. B. G ASSIES has bred hybrids of the French and Algerian races of 
Rumina decollata (L.) at Bordeaux ; they form a new variety, with 
dentiform callosity at the aperture, not before known in France. Actes 
Soc. L. Bord. xxxiii., with a plate ; abstract, J. de Conch, xxxv. pp. 565 
& 566 ; translated in Q. J. Conch, ii. pp. 356-358. 
GEOGRAPHICAL DISTRIBUTION. 
a. Land and Freshwater Mollusca. 
Several instances of land-snails, which occur at very distant geo- 
graphical points, but not in the intermediate countries, are adduced by 
Paulucci, Bull. Soc. mal. Ital. v. pp. 189 & 190 [some of them appear 
rather improbable]. 
Note on the conchological fauna in the alluvial deposits of rivers, how to 
