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ge Grubenmann, Gesteine der sedimentären Mulde von Airolo. 15—39. 

 ph V. Martini Fr, Lage d. Doppelbilder beim binocularen Sehen, 40 -71. 

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 //^Kiefer, Geometr. Lösung einer einfachen Aufgabe a. d. Optik. 105. 

 zo Keller, Fauna im Suez-Canal. 119 — 27. 



— Stricker G, Aus dem Leben der Ameisen. 128 — 52. 

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Baitimor e.Johis Hopkins Univ, Circulars. YoLYIII. Nr. 75. 



i^^Williams H, Contributions to the Mineralogy of Maryland. 99. 



— Gill A C, Note on some Minerals from the Chronie Pits of Mont- 



gomery County, Maryland. 100. 

 zo Hodge C F, A Study of the Oyster beds of Long Island Sound with 



reference to the Ba vages of Starfish. 102. 

 /i^Easton M W, Association in Substitution and Rotation. 102. 



Berlin, Akad. der Wissensch. Sitzungsb. 1889. H. 38. 



mt"^. Helmholtz, lieber atmosphärische Bewegungen. (Forts.) 761. 

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Ladenburg, üeber die Darstellung optisch aktiver Tropasäuren und 

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//^Wüllner, Allmähliger llebergang der Gasspectra in ihre verschied. 

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Philadelphia, Acad. of Nat Sc. Proceed. 1889. Bg. 13-20. 



zo McCook H, Note on the true Systematic Position of the Ray Spider. 180. 



^/'Koenig G 0, Chloantite, Nicolite etc. from Franklin. 184. 



zo Pilsbry H A, Nomenclature and Check-List of North American 



Land Shells. 191. 

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Leidy. 211. 



zo Kirsch P H and Fordice M W, A Review of the American Speeles 

 of Sturgeons (Acipenseridae). 245. 



— Kirsch PH, A Review of the European and American Urano- 



scopidae or Star-Gazers. 258 



— Baker F C, Notes on the Food of Birds. 266. 



— — Remarks upon the Round-Tailed Muskrut, Neofiber Alleni 



True. 271. 



Dali W H, Anatomy of Phalas costata L and Zirphaea crispata L. 274. 



— Pilsbry H A, Anatomy of Aerope and Ziugis. 277. 



ho Wingate H, Orcadella operculata, a New Myxomycete. 280. 



pa Keyes Ch R, Lower Carbonic Gasteropoda from Burlington, Jowa. 284. 



— — The American Speeles of Pulyphemopsis. *299. 



— — Sphaerodoma, a Genus of Fossil Gasteropods. 303. 



BucMruckerei „Frankfurter Post", Bischofstrasse 20. 



