1881. ] Geology and Paleontology. 497 
(From the American Naturalist, Fune, 1881.) 
Miocene Docs.—In the Bulletin of the Hayden Survey, Vol. 
VI, p. 177 (Feb., 1881), I gave a synopsis of the genera and spe- 
cies of this family found in the Lower Miocene formation of the 
Western Territories. These numbered seven and nineteen respect- 
ively. The recovery and discovery of some material since that 
date, enables me to make the following corrections and additions: 
(1) The proper dental formula of Hyenocyon is 1.4; C.4; Pm. 
3; M.}. Its reference to the Canidz is not certain. (2) It seems 
that the species I named /cticyon crassivultus cannot be placed in 
Icticyon on account of an important difference in the dental 
formula. It must be considered typical of a new genus which I — 
will call O&gobunis, and compare its characters with those of 
Icticyon as follows: Oligobunis, 1.3; C.4; Pm. *; M. 2; an in- 
ternal tubercle of the inferior sectorial, which has a basin-shaped 
heel; Jcticyon, I. 2; C.4; Pm.4; M.2; no internal tubercle of 
the inferior sectorial, which has a trenchant heel—Z. D. Cope. 
GrotocicaL News.—Dr. Alpheus Hyatt has published his re- 
searches on the forms of Planoréis found in the Tertiary beds of | 
Steinheim. The variations are extraordinary, and furnish im- 
portant evidence for the evolutionist. Neumayr and Uhlig 
publish an extensive and well illustrated paper on the Ammonites 
of the “Hilsbildungen” of North Germany, in the last number 
of the Palgontographica. Professor H. A. Nicholson, of Edin- 
burgh, publishes a handsomely illustrated volume on the possibly 
polypoid group of the Monticuliporide. Mr. S. A. Miller has 
recently described some additional species of the interesting genus 
Myelodactylus Hall. Professor Cope has published in the Pro- 
ceedings of the American Philosophical Society, the cuts illus- 
trating the Permian vertebrata described in his Paleontological 
Bulletin, No. 32. The genera illustrated are Eryops, Cricotus, 
Empedias (= Empedocles nom. praeoce.) and Dimetrodon. 
Published May 28, 1o8t. 
