C O N T E N T S. 



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No. 1.— Contributions from the Zoological Laboratory. XVII The His- 

 tology and Development of the Eye in the Lobster. By G. H. Parker. 

 (4 Plates.) May, 1890 1 



No. 2. — On the Rate of Growth of Corals. By A. Agassiz. (4 Plates.) 

 August, 1890 61 



No. 3. — Preliminary Account of the Fossil Mammals from the White 

 River and Loup Fork Formations. Part II. Carnivora and Artiodactyla, 

 by W. B. Scott. Perissodactyla, by H. F. Osborn. (3 Plates.) ... 65 



No. 4. — Contributions from the Zoological Laboratory. XIX. Cristatella : 

 the Origin and Development of the Individual in tlie Colony. By C. 

 B. Davenport. (11 Plates.) 101 



No. 5. — Contributions from the Zoological Laboratory. XX. The Eyes 

 in Blind Crayfishes. By G. H. Parker. (1 Plate.) November, 1890 . 153 



No. 6. — Notice of Calamocrinus Diomedae, a New Stalked Crinoid from 

 the Galapagos, dredged by the U. S. Fish Commission Steamer "Alba- 

 tross." By A. Agassiz. December, 1890 165 



No. 7. — Contributions from the Zoological Laboratory. XXI. The Origin 

 and Development of the Central Nervous System in Limax niaximus. 

 By Annik p. Henchman. (10 Plates.) December, 1890 169 



No. 8. — Contributions from the Zoological Laboratory. XXII. The Parietal 

 Eye in some Lizards from the Western United States. By W. E. Ritter. 

 (4 Plates.) January, 1891 209 



