270 General Notes. [ April, 
GEOLOGY AND PALZONTOLOGY. 
THE Genus Caztopon.—In the Vidensk. Selsk. Skr. v, 1887, 
Prof. J. G. Reinhardt gives the first full account of the genus 
Celodon of Lund, heretofore only described from a few fragments. 
The remains were all found by Lund in Brazil, and include, be- 
sides the fragments of the C. maguinensis,a skull and a good 
many bones of the skeleton of a second species which is described 
by Reinhardt as C. escrivanensis. The characters of the genus 
are very interesting, being near to Megatherium, although the 
species were not larger than the great ant-eater. The paper is 
well illustrated. 
Dawson on Eozoon.—In the last number of the Amur. Fourn. 
of Science and Arts, Prof. Dawson criticises the memoir of 
Mobius mentioned in the last number of the Naruratist. He 
thinks that Dr. Mébius has misinterpreted the evidence derived 
from his specimens. Thus he has mistaken the veins of chryso- 
tile, which traverse the serpentine and calcite, for the walls of the 
Fozoön chambers, His objections to the unsymmetrical and 
irregular forms of the large so-called tubules, are met by the 
statement that these irregularities are due to pressure, faulting 
and other incidents of fossilization. The regular round and . 
branching tubules, regarded as accidental by Mobius, are stated 
to be the normal structure by Dawson. 
A New Genus oF PerissopactyLta.—In 1873 I described a 
species of ungulate, supposed to be related to the Rhinoceride, 
te river beds of Colorado, under the name of Hy- 
vacodon quadriplicatus, Further investigation shows that this 
animal represents a genus hitherto unknown, whose affinities are 
probably as much to the tapirs as to the rhinoceroses. The molars 
have the form and structure of those of Lophiodon, and the third 
and fourth premolars have the same characters as the true molars, 
which is not the case in that genus. The second premolar pre- 
sents the elongate form characteristic of some species of Anchi- 
therium. It has two cross-crests, and the external longitudinal 
crest presents three lobes besides the anterior and posterior pro- 
longations, somewhat as in the corresponding deciduous tooth. I 
call this genus Anchisodon: the species A. guadriplicatus was as 
large as the Aceratherium occidentale. A second species has been 
found in the John Day region of Oregon, in the White river 
formation. Its molar teeth differ in the presence of a fossa which 
is isolated by the contact of the edges of two processes, one from 
the external crest, the other from the posterior cross-crest. The 
anterior cross-crest has no processes; there is a compressed ee 
cle at the entrance of the transverse valley, but no cingulum 
the posterior base of the crown as in A. guadriplicatus. The ire 
and aft diameter of a middle molar is .028 m., the transverse .028. 
The anterior crest is strongly recurved, and "the posterior notch 
