1892,] Proceedings of Scientific Societies. 1059 
camel, and three carnivora. The most interesting discovery is that of 
a hyena, a form which has not hitherto been found in America. Its 
size is about that of the living spotted hyena. The other carnivora 
are a weasel the size of a fisher, and a cat about the size of a cheetah, 
both new to science. Two of the mastodons are very large, and the 
first (Dibelodon humboldtii) has hitherto been found only in South 
America, and the second (D. tropicus) in Mexico, while the third is 
new to science (D. precursor). The horses are true species of the 
genus Equus—having but one toe—but one of them is remarkable for 
its small size, as its teeth do not exceed in size those of a sheep. The 
peccary is entirely a new form, while the camel ranks somewhere 
between the ordinary camel and the Procamelus, somewhat exceeding 
the ordinary camel in size.” 
The Biological Society of Washington.—Nov. 5, 1892— 
The following communications were read: The Fauna and Flora of 
Roan Mountain, N. C., Dr. C. Hart Merriam; Pea and Bean Weavils, 
Prof. C. V. Riley; The Influence of the Cross Timbers on the Fauna 
of Texas, Mr. Vernon Bailey. FREDERICK A. Lucas, Secretary. 
Boston Society of Natural History.—Nov. 2.—The following 
paper was read: Certain Aspects of the Vegetation of New Zealand, 
Prof. George L. Goodale—SamuEL HeEnsHaw, Secretary. 
The New York Academy of Sciences has recently organ- 
ized a Biological Section, which will hold monthly meetings. At the 
opening meeting, Oct. 17, Prof. Henry F. Osborn acted as chairman. 
The following papers were presented: Bashford Dean on Dionxa 
Under Its Native Conditions Near Wilmington, N. C.; the results of 
experiments emphasizing the plant’s erratic sensibility and its special 
adaptation for capturing ground insects. N. L. Britton on a species 
of Hieracium; E. B. Wilson on The Artificial Production of Twins 
and Multiple Embryos in Amphioxus. The paper dealt mainly with 
the peculiarities of double monsters produced (as in Driesch’s experi- 
ments on Echinus) by shaking apart the blastomeres of two- and four- 
_ celled stages, (vide Anatomischer Anzeiger, 1892.) Every gradation 
exists between the two perfect and separate bodies, each half the normal 
size, and four in which the only indication of duality cousists of a 
bilobed condition of the archenteron. In the double gastrulas the long 
axes of the two halves may furm any angle with each other, and the 
two blastopores when separate may be turned in any direction. In 
cases where the two blastopores face each other the two bodies are 
