30 Moll . 
MOLLUSCA. 
Willem, V. Note sur le proc6d6 employ^ par les Gast^ropodes d’eau 
• douce pour glisser a la surface du liquide. Bull. Ac. Belg. lvii, pp. 
421-430, 1 pi.; abstr., J. R. Micr. Soc. 1888, p. 718. 
Williams, J. W. (1) The Shell Collector’s Handbook for the Field. 
London : 1888, 12mo, 148 pp. 
. (2) Land and Fresh-water Shells : an Introduction to the Study 
of Conchology . . . with a chapter on the Distribution of the British 
Land- and Fresh-water Mollusca , by J. W. Taylor & W. Denison 
Roebuck. London : 1889, 8vo, 112 pp. [issued 1888]. 
. (3) Vertigo minutissima (Hartm.) in Gloucestershire. J. of Conch. 
v, p. 357. 
. (4) The Red Fluid emitted by Planorbis corneus. T. c. p. 363. 
. (5) On the Morphology of the Gonads in Limncea stagnalis (L.), 
and L. peregra (Miill.). T. c. pp. 364-369. 
. (6) Limncea auricularia floating. T. c. p. 369. 
, (7) Geographical Distribution. Sci. Goss, xxiv, p. 115. [Remark 
on Cockerell, T. D. A. (7).] 
. (8) On Collecting and Preserving Land and Fresh-water Shells. 
Wesley Nat. i, pp. 354-356. 
. (9) Land and Fresh-water Shells. Op. cit. ii, pp. 16-18, 76-79, & 
109-112. [Nothing new.] 
Williams, W. M. The Muzzling of Oysters. Nature, xxxvii, p. 585. 
Winkley, W. H. Mollusca found in the Oyster Beds of Cocagne, N. B., 
Bedeque, and Summerside, P. E. I. Bull. Nat. Hist. Soc. New 
Brunswick, No. 7, pp. 69-71. 
Woodward, B. B. Note on the pleistocene land and fresh-water Mollusca 
from the Harnwall Gravels. Proc. Geol. Assoc, x, pp. 355-360. 
Wotton, F. W. The Land and Fresh-water Shells of Cardiff. Cardiff 
Nat. Soc. xx, pp. 32-39, pi. 
Wright, B. H. (1) Check List of North American Unionidce and other 
Fresh Water Bivalves. Portland, Oregon : 1888, 8vo, 8 pp. 
. (2) Descriptions of new species of Uniones from Florida. P. Ac. 
Philad. 1888, pp. 113-120, pis. ii-vi. 
Wright, S. H. A New Unio [ (J . orcuttii]. West Amer. Sci. 1888, 
p. 60, pi. 
Wright, S. H. & B. H. Notes upon the Unionidce of Southern Florida. 
Conch. Exch. ii, pp. 67, 95, 111, & 112. 
Yung, E. Contributions k l’histoire physiologique de l’Escargot {Helix 
pomatia ). M6m. Cour. 4to, xlix, 119 pp., 1 pi. [Published separately, 
1886.] 
. See also Vogt. 
Zabriskie, J. L. The Radula of the Conch, Lycotypus canaliculatus } 
Gill. J. N. Y. Micr. Soc. iv, pp. 1-7. 
Zacharias, O. Zur Kenntniss der Fauna des Siissen und Salzigen Sees 
bei Halle a/S. Z. wiss. Zool. xlvi, pp. 217-232. [ Mollusca , pp. 
229-231.] 
