31 



Vol. XX. 



No. 1. The Histology and Development of the Eye in the Lobster. By G. 



H. Parker, pp. 60. 4 Plates. May, 1890. 



(Vol. XX. to be continued.) 



Of the Memoirs. 



Vol. XVI. 



No. 3. Genesis of the Arietid^e. By A. Hyatt, pp. i.-xii., 238. 14 Plates 



and 6 Tables. Published in Conjunction with the Smithsonian Institution. 



December, 1889. 



(Vol. XVI. is completed.) 

 Vol. XVII. 



No. 1. The Immature State of the Odonata. Part III. Sub-family Cordu- 



lina. By Louis Cabot, pp. 52. 6 Plates. February, 1890. 



