38 
27. STUDIES IN THE GENUS POTENTILLA. Specimens illustra- 
ting new and rare North American species. 
Nos. 26 and 27 exhibited by Per Axel Rydberg, A. M. 
(Columbia University). 
bo 
(ov) 
Two New GENERA Collected by the Exhibitor in Bolivia. 
Rusbyella Rolfe, in the Orchidaceez, and Rusbyanthus 
Gilg, in the Gentianacee. 
29. FirTEEN NEw SPECIES OF RUBIACE#, collected in Bolivia 
by Miguel Bang. 
Nos. 28 and 29 exhibited by Prof. H. H. Rusby, M. 
D. (College of Pharmacy.) 
30. CriticAL PLANTS OF THE LocAL FiLora. Exhibited by 
Eugene P. Bicknell (Torrey Botanical Club). 
Specimens illustrating a special study of the local flora 
now in progress by the exhibitor. Illustrations from the 
genera Carex, Sisyrinchium, Hypericum and Helianthe- 
mum. 
31. ADDITIONS TO THE FLora oF NEw JERSEY. Fifteen speci- 
mens. Exhibited by William Van Sickle (Torrey Botan- 
ical Club). 
32. ADDITIONS TO THE FLORA oF RicHMOND CouNnTy, NEW 
YORK. 
These plants represent the species upon which was 
based the seventh appendix to the flora of Richmond 
County (Staten Island) New York, published by Arthur 
Hollick and N. L. Britton in 1879. The original cata- 
logue contained about 1100 species. With the seven 
appendices the total now amounts to about 1400 species. 
33. Lecumrinous Pops from the Yellow Gravel Sandstone at 
Bridgeton, New Jersey. 
These pods represent the genera Mezoneurum and Lon- 
chocarpus. They occur in sandstone of late tertiary or 
pleistocene age in the vicinity of Bridgeton, Cumberland 
County, New Jersey. The genus Mezoneurum is not 
