196 General Notes. [February, 
tation in believing that such a bone will be found in the Amblypoda’ 
and in embryos of Elephas, Tapir, Rhinoceros and Hippopotamus. 
Whether itis coalesced with the radiale or with the trapezoid (tars.”) 
or whether it has become wholly atrophied, I am not able to de- 
cide. (According to Flower: Osteol. of Mamm., 11 edit., p. 265, in 
Hyrax dorsalis the central bone is coalesced with the trapezoid.) It 
would be interesting to know whether in the Periptychide, the 
Phenacodontidz and the Meniscotheride, the three families of 
Cope’s Condylarthra, indications of a central bone can be found. 
It seems improbable that such indications must exist. Further- 
more in regard to the Cetacea. If Leboucq’s hypothesis, that 
we might consider in these animals certain ‘‘ metacarpiens”’ as 
“ carpo-metacarpiens”’ should be shown to be correct, then this 
last point would be elucidated. 
Further morphogenetic researches on the limb-skeleton of the 
vertebrates will remove many present uncertainties and errors. I 
would hence be glad to receive, from those interested in the 
subject, any embryological material that will enable me to make 
further investigations upon these points. The most important 
stages are, when cartilage begins to appear, or is already devel- 
oped. In future studies I hope, so far as possible, to elucidate 
the morphology of the limb-skeleton of vertebrates and to bring 
to light new points on the phylogenetic relations of the different 
groups of vertebrates—Dr. G. Baur, Yale College Museum, New 
Haven, Conn., Oct. 1884. 
THE TRAPEZIUM OF THE CAMELID&.—Professor Cope? says in 
regard to the carpus of Poébrotherium, one of the ancestors of 
the Camelide: “The carpus consists of eight bones, the entire 
mammalian number, all entirely distinct. The second series pre- 
sents the most important peculiarities. The trapezium is small 
and posterior; the trapezoides has an almost entirely lateral pre- 
sentation, and is also small, and fits an angle of the magnum. 
There are two principal and two rudimental metacarpals. The 
second and fifth are very short and wedge-shaped, and closely ad- 
herent in shallow fossz of the third and fifth, respectively.” 
It is generally considered that the living Camelide have no 
trapezium. I cannot, however, agree with this assumption. At 
the posterior part of the trapezoid of an adult Camelus bactrianus 
L., I finda well developed articular surface; it is the same face 
that is seen in different Cervidæ, and can only be for the trape- 
zium. 
1 Professor Cope believes that there is an os centrale (“intermedium ”) in Cory- 
phodon. - 
? Annual Report of the U.S. Geol. and Geog. Survey for 1873. Washingion, 1874, 
499. 
P- i 
-~ 3 Baur, G. Der Carpus der Paarhufer. Eine morphogenetische Studie (Vorläufi 
Mittheilung). Morphol. Jahrb. 9, 1884, pp. 600. EEE 
A Nae E CRT WOR ea AEE FS 
