1884.] Geology and Paleontology. 1137 
This consisted in the characters derived from the long bones of 
the limbs. Professor Owen first called attention to this resem- 
blance in the genus Cynodraco, which is a Theromorph reptile. 
I next pointed out corresponding peculiarities in the bones of the 
American Theromorphs. I afterwards showed the resemblance be- 
tween the pelvis of the Pelycosaur division and that of the Mono- 
tremata. This was followed by a demonstration of the resem- 
_ blance between the coracoid of the Pelycosauria and the Mam- 
malia Monotremata, especially to that of the genus Platypus. 
The present note now adds that the structure of the posterior foot 
approaches near to that of the Monotremata in having distinct 
navicular and cuboid bones, and that the astragalus and calcan- 
eum are essentially like the corresponding part in the Platypus 
anatinus. The last two points are essential and fundamental. The 
three great distinctions between the Mammalia and the Reptilia 
in the skeleton are : (1) In the quadrate bone; (2) in the cora- 
coid bone, and (3) in the occipital condyle. Of these the first is 
of less importance than has been believed, if, as maintained by 
Peters and others, it is to be excluded from the series of ear- 
bones. Its relations to the zygomatic arch in some Pclycosauria 
look as if Albrecht’s view, that it represents part of the squamosal 
done of Mammalia, is correct. The last character is weakened 
in importance by the fact that in some of the geckoes the condyle 
is double, which is due to the reduction of the basioccipital ele- 
auris. No reptile is yet known where that element is divided 
ted incus, orbicularis, and stapes as in the Mammalia and some 
oe: CERATIOCARIDE OF Pennsytvanta-—This brochure, 
r, C. E. Beecher, comprises descriptions of 
S as constitute the family Ceratiocaridz, which have been ae 
lected in the rocks of the Chemung and Waverly poo. aa 
‘“ansylvania, and is extracted from report of progress ibed 
Seological survey of that State. Several new forms are pasi t 
and well figured, and considerable structural details relating A 
the genus Echinocaris of Whitfield, with excellent figures aig 
Special attention is called to the terminology, wmc 
