1881. ] Geology and Paleontology. 829 
GEOLOGY AND PALAONTOLOGY. 
Creodont genera Periptychus, Triisodon and Deltatherium, and 
probably the Saurian Champsosaurus. 1 now add the genera 
Hyracotherium, Meniscotherium and Mesonyx, and a number of 
new forms of considerable interest. These are a new genus allied 
to Esthonyx, and a series of genera and species with a suilline 
type of dentition, but whose affinities are by no means certain. 
This point cannot be determined until the characters of the feet 
are known 
Conoryctes comma, gen. et sp. nov. Char. gen—Allied to Esth- 
onyx. Inferior canines not rodent-like, with conic crowns. Mo- 
lars 3-3, the first one-rooted, the second two-rooted, the third 
With an anterior conic cusp and a posterior grinding heel. True 
molars consisting of two lobes, of subcylindric section, separated 
by deep vertical grooves. Enamel developed on internal and 
external faces of crowns. Char. specif-—Founded on a mandibu- 
lar ramus which lacks the last molar, and has the crowns of the 
others worn. The external faces of the molars are much more 
exposed than the internal, and are somewhat contracted inwards. 
n the unworn crown there is a distinct anterior inner cusp, 
which is soon confounded on attrition. The heel of the last pre- 
of do., 0065. Anteroposterior diameter of base of crown of 
canine, .o1o. Depth of ramus at first true molar, .023 ; width of 
0. at do.,.013. This genus differs from Zsthonyx in the form of 
the fourth premolar. In the latter the anterior lobe is com- 
Pressed and trenchant. The species is longer than any of that 
genus, and nearly equal to the Actoganus gliriformis. 
ap? rhabdodon, gen. et sp.nov. Char gen.—With this 
dentition, which has some resemblance to that of some of the 
hogs. The one above named, with Miaclenus, remind one of 
"April and August, 1881. 
