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XIX 
Sitzungsberichte der Naturforscher-Gesellschaft bei der 
Udiversität Dorpat. 
Bd. IX, Ht. 3, 1891 Dorpat, 1892. 
Schriften, herausgegeben von der Naturforschenden 
Gesellschaft in Dorpat. 
No. VI, 1891. Dorpat, 1891. 
Mémoires de la Société des Naturalistes de Nouvelle 
Russie (Odessa). 
Tome XVI (II). Odessa, 1892. 
Mémoires de la section mathématique de la société des 
naturalistes de la nouvelle Russie (Odessa). 
T.… XII, 1892, 
Noorp-Amerika (Im). 
Proceedings of the Academy of Natural Sciences of 
Philadelphia. 
1892 Part 1, Philadelphia, 1892. 
Proceedings of the Boston Society of Natural History. 
Vol. XXIV Pt, EI, IV; Vol. XV Pt, I, II. Boston, 1891. 
Memoirs of the Boston Society of Natural History. 
Vol. IV No. V[l—IX. Boston, 1890. 
Proceedings of the American Academy of Arts and 
Sciences. 
Whole Series, Vol. XXVI Boston, 1891. 
Annals of the New-York Academy of Sciences. 
Vol. VI No. 1-6 New-York, 1891. 
Transactions of the New-York Academy of Sciences, 
1889/90, Vol. X [7—8] Vol. XI (1—5) New-York, 1891—92. 
Transactions of the Wisconsin Academy of Sciences, 
Vol. VIII, 1888-1891 Madison, 1892. 
Bulletin of the Essex Institute. 
Vol 19, 20, 21, 22- Salem, 1887—90. 
Smithsonian Contributions to knowledge. 
Vol. XXVIII, Washington, 1892 
Annual Report of the Smithsonian Institution. 
For the year 1890, 1, Washington, 1891, 
