CONTEIS^TS. 



Standing Committees for 1892 



Banks, Nathan. The Spider Fauna of the Upper Cayuga Lake Basin. (Plates I, 

 II, III, IV and V.) 



WiSTAR, Isaac J. Remarks on the Quantity, Rate of Consumption and Probable 

 Duration of North American Coal and the Consequences to Air-breathing 

 Animals of its entire combustion. ......... 



Rhoads, Samuel N. The Birds of Southeastern Texas and Southern Arizona 

 observed during May, June and July, 1891. ...... 



McCooK, Rev. H. C. Drexelia, a new Genus of Spiders. . . 



PiLSBRY, H. A. Anatomy of West Indian Helices. (Plate VI.) 



PiLSBRV, H. A. New and Untigured Unionidse. (Plates VII and VIII.) 



Fox, William J. Report on the Hymenoptera collected in West Greenland. 



Brown, Amos P. The Development of the Shell in the Coiled Stage of Baculites 

 compressus Say. (Plate IX.) 



Ives, J. E. A new Species of Pycnogonum from California. (Plate X.) . 



Stone, Witmer. Birds collected by the West Greenland Expedition. 



PiLSBRV, Henry A. A new Species of Pachychilus. (Plate VIII.) 



Skinner, Henry, M. D. Greenland Lepidoptera . 



MEEHA.N, Thomas. Contributions to the Life-Histories of Plants, No 7. On the 

 Vitality of some Annual Plants. On Self-pollination in Amsonia Tabernje- 

 montana. On a special form of Cleistogamy in Polygonum acre. On the 

 Direction of Growth in Cryplogamic Plants. Tricarpellary Umbellifers. A 

 Mode of Variation in Stellaria media. On the Sexes of the Holly. On the 

 Stamens of Ranunculus abortivus. On the Character of the Stamens in 

 Ornithogalum umbellatum. Note on Barbarea in connection with Dichogamy. 



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