THE NATURAL HISTORY SURVEY. 375 



PFEIFFER, DR. Louis. (Pfr.) Nebersicht der im Januar, Februar und 



Marz, 1839, auf Cuba gesammelten Mollusken. (From Archiv fur 



Naturgeschicte in verbindung mit mehrerngelehrten herausgegeben 



von Ar. Fr. Aug. Wiegmann, Berlin, 1840.) (Wiegm. Arch.) 

 Novitates Conchologicse Land-Conchylien. Cassel. Various numbers. 



(Nov. Conch.) 



.. ..Symbols ad Historium Heliciorum. Cassel, 1841. (Symbols.) 

 .... In Proc. Zool. Soc., p. 53, 1864. 

 .... In Mai. Blatt., p. 86, 1867. 

 PILSBRY, HENRY A. (Pils.) A classified Catalogue of American Land 



Shells, with Localities. (From The Nautilus, Vol. XI, pp. 45, 59, et seq., 



1897-1898.) 

 A New Species of Fresh-water Mollusk. Review of Prof. B. Shimek's 



paper on Ancylus obliquus. (From same, Vol. IV, No. 4, p. 48, 1890.) 

 Critical List of Mollusks collected in the Potomac Valley. (From Proc. 



Phil. Acad., pp. 11-31, 1894.) 

 . . . .Contributions to the Zoology of Tennessee. No. 4, Mollusks. (From 



same, pp. 487-506, 1896.) 

 .... Descriptions of New Species and Varieties of American Zonitidas and 



Endodontidse. (From The Nautilus, Vol. XII, No. 8, p. 85, Dec., 1898.) 

 Descriptive Notes on Certain Forms of Polygyra. (From The Nauti- 

 lus, Vol. VII, pp. 139-141, 1894.) 

 Guide to the Study of Helices. (Vol. IX, Series II, Tryon's Manual of 



Conchology, 1894.) 

 Land and Fresh-water Mollusks collected in Yucatan and Mexico. 



(From Proc. Phil. Acad., pp. 310-334, 1891.) 

 . . . .Littoral Land Shells of New Jersey. (From The Nautilus, Vol. V, pp. 



141-142, 1892.) 

 New American Fresh-water Mollusks. (From same, Vol. VIII, pp. 



114-116, 1895.) 

 . . . .Nomenclature and Check-list of North American Land Shells. (From 



Proc. Phil. Acad., pp. 191-210, 1889.) 

 Notes on New and Little-known Amnicolidae. (From The Nautilus, 



Vol. XII, No. 4, p. 42, 1898.) 



On the Australasian Gundlachia, by C. Hedley, with notes on Ameri- 

 can forms. (From same, Vol. IX, pp. 61-68, 1895.) 

 Preliminary Notices of New Amnicolidse. (From same, Vol. IV, pp. 



52-53, 1890.) 

 Preliminary Outline of a New Classification of the Helices. (From 



Proc. Phil. Acad., pp. 387-404, 1892.) 

 Remarks on the American Species of Conulus. (From The Nautilus, 



Vol. XII, No. 10. p. 113, 1899.) 

 The Aulacopoda; a Primary Division of the Monotremate Land Pul- 



monates. (From same, Vol. IX, pp. 109-111, 1896.) 



.... Zonites ligerus, var. Stonei. (From The Nautilus, Vol. Ill, p. 46, 1889.) 

 Note on some New Mexican Shells. (From same, Vol. XIII, p. 79 



1899.) 



A New Variety of Polygyra monodon. (P. monodon friersoni.) (From 



The Nautilus, Vol. XIII, p. 36, 1899.) 



