1208 General Notes. [ December, 
Dr. Schlosser, of Munich, endeavors to show that Dr. Lydek- 
ker is in error in proposing, in the catalogue of the vertebrate 
fossils in the British Museum, to combine certain species of, Ro- 
dentia, described by him in his monograph of the Tertiary Roden- 
tia of Europe. . 
Dr. Lydekker, in the London Geological Magazine, reviews 
the illustrated papers published by Professor Cope in the AMERI- 
can NATURALIST on American fossil Vertebrata. He differs gen- 
tity of Hyopsodus Leidy with Microchcerus Wood; and of 
Esthonyx Cope with Miolophus Owen. Professor Cope, in a 
note to the Geological Magazine, shows that there is not sufficient 
ground for the latter identification. 
Dr. Baur believes that the bone in Iguanodon supposed by 
Marsh to be clavicle, is really sternum, as indicated by Dollo. 
THE ANKLE AND SKIN OF THE DINOSAUR, DICLONIUS MIRABILIS. 
—The fibula of this saurian lies at its distal end in a groove of 
the external part of the front of the tibia. It is compréssed so 
as to be anteroposterior. It terminates in an epiphysis-like cal- 
caneum. The astragalus has the usual form, and embraces the 
tibia closely. Its anterior ascending process is rather short and 
thin. Posteriorly the tibia rests on the astragalus and is not 
overlapped by it. A portion of the extremity descends and fills 
an angular space which enters between the astragalus and cal- 
caneum behind, and takes part in the ankle-joint. This does not 
_ occur in the Oruithotarsus immanis. ; 
portion of the integument from the pelvic region of this 
dinosaurian is preserved. It is indicated by a thin brown layer 
like the remains of corneous teeth, which I have described as 
existing in the premaxillary region.! It is in the form of small 
sub-pentagonal disk-like scales, each with a beveled and coarsely 
crenate margin. They do not fit closely except at the interior or 
basal part of their edges. The scales resemble considerably the 
divisions of the skin of Rhinocerus sondaicus, The scales are 
about a centimeter in diameter.—£. D. Cope. 
PLiocene Horses oF SouTHWESTERN TExAS.—The pliocene 
beds of Southwestern Texas have yielded several interesting 
species of Mammalia. Among these may be mentioned Mastodon 
~ americanus Cuy. and M. serridens Cope? and Cistudo marnockit 
_ Cope. But horses of the genus Equus are the most numerous in 
species and individuals. The following identifications are base 
| specimens received from Messrs. Wm. Taylor and G. W. Mar- 
whom I hereby express my acknowledgments. 
ings Academy Philadelphia, 1883, p. 104. 
