Vol. 50.] ADDITIONS TO THE LIBRARY. 233 



Beecher, G. E. A Larval Form of Triarthrus, 8vo. New Haven, 

 1893. 



Larval Forms of Trilobites from the Lower Helderberg 



Group. 8vo. New Haven, 1893. 



On the Thoracic Legs of Triarthrus. 8vo. New Haven, 



1893. 



. Some Correlations of Ontogeny and Phylogeny in the Bra- 



ehiopoda. 8vo. Philadelphia, 1893. 



. On the mode of Occurrence, and the Structure and Develop- 

 ment of Triarthrus Becki. 8vo. Rochester, N.Y., 1894. 



. The Appendages of the Pygidium of Triarthrus. 8vo. 



Rochester, N.Y., 1894. 



Behrens, H. Beitriige zur Petrographie des Indischen Archipels. 

 Hefte 1 & 2. Amsterdam, 1880 & 1883. Purchased. 



Mikrocheniische Methoden zur Mineral-Analyse. 8vo. 



Amsterdam, 1882. Purchased. 



. Leber eigenthuemliche Krystallgebilde in einem vulkanischen 



Gestein von der Insel Timor. 8vo. Amsterdam, 1883. Pur- 

 chased. 



Berghell, H. See Finland. 



Bertrand, 0. E., et B. Renault. Reinschia australis et premieres 

 remarques sur le Kerosene Shale de la Nouvelle Galles du Sud. 

 8vo. Autun, 1894. 



Bertrand, Marcel. Lignes directrices de la geologie de la France. 

 4to. Paris, 1894. 



. Sur la Structure des Alpes franchises. 4to. Paris, 1894. 



Bigot, A. Contributions a l'etude de la Faune Jurassique de Nor- 

 mandie. l r Memoire sur les Trigonies. 4to. Caen, 1893. 



Bittner, A. Zur neueren Literatur der alpinen Trias. 8vo. 

 Vienna, 1894. 



Blake, J. F. See Periodicals. London. Annals of Geology. 



Blake, W. P. The Existence of Faults and Dislocations in the 

 Lead and Zinc Regions of the Mississippi Valley, with Observa- 

 tions upon the Genesis of the Ores. 8vo. New York, 1893. 



. The Mineral Deposits of South-west Wisconsin. 8vo. 



New York, 1893. 



The Progress of Geological Surveys in the State of "Wisconsin. 



8vo. Madison, 1893. 



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