212 The Molluscan Family Planorbidae 



Ward, Henry B., and Whipple, Geo. C. (1918). Fresh-water Biology. New York. 



(Chapter XIII, Parasitic flatworms, pp. 365-424, by Henry B. Ward.) 

 Wenz, W. (1923). Gastropoda extramarina tetiaria. In Fossilium Catalogus I: Ani- 



malio, Pars 22, pp. 1421-1734. Edited by C. Diener. Berlin. 

 White, C. A. (1883). The Molluscan fauna of the Truckee group, including a new 



form. Proc. United States Nat. Mus., V, pp. 99-102, plate 5. 

 Westerlund, C. a. (1885). Fauna der in der Palaarctischen Region . . . lebenden 



Binnenconchylien. Lund, Fascicle V, pp. 135-|-14. 



(1899). Planorbis libanicus n. sp. Nachrbl. Deutsch. Mai. Ges., pp. 170-171. 



(1902). Methodus dispositionis Conchyliorum extramarinum in regione 



palaearctica viventium, familias, genera, subgenera, et stirpes sistens. Rad. 

 Jugoslav. Akad., CLI, pp. 82-139. (1-58). 



WoLLASTON, T. V. (1878). Testacea Atlantica, etc. Pp. xi+588. London. 



Woodward, S. P. (1851-1856). A manual of the Mollusca. Published as follows: Pt. 1, 

 pp. 1-158, 1851; Pt. 2. pp. 159-330, 1854; Pt. 3, pp. 331-486, 1856. Several subse- 

 quent editions. (Raljih Tate has an appendix in 1869 in which Pompholyx 

 appears.) 



Zittel, Ivarl a. von (1910). Grundziige der Paliiontologie (Palaozoologie). I. Abteil- 

 ung Invertebrata. Neubearbeitet von Dr. Ferdinand Broili. Munchen und Berlin. 

 x4-607 pp., 1414 text figs. 



