Review of Recent Geoloyieal Literature. 357 
contain them, the sa'me author has found ii necessary to issue a special 
addition to his catalogue of American Paleozoic fossils. In the five pages 
mentioned it is safe to say thai no less than four-fifths of the species de- 
scribed as ••new" must be relegated to the limbo of synomyms. 
The illustrations accompanying the "descriptions" are in most cases 
woefully inaccurate as regards the structural features of the objects 
represented, or rather misrepresented. Several are so poorly depicted 
that it would be an utter impossibility for even the most expert to tell 
the order to which the} should be referred. 
It is to be hoped that under the new regime the Illinois State Museum 
of Natural Ilistorv will turn its efforts in a more fruitful direction. 
A n nr sub-ord{ r of tin Ancylopoda. By Henry Fairfield Osborn. 
(Trans. X. Y. Acad. Sci., vol. xn. p. 95.) The foot of Artionyx is dis- 
tinguished from that of Chulieotlu ■rinm by the character of ankle and 
pes. which present a marked resemblance to the Artiodactyla, while 
Chalicotherium represents these structures as found in the Perissodac- 
tyla. Both genera are ungulate in ankle joint, but the phalanges termi- 
nate in claws. In view of the double parallelism between these two 
forms and the t wo subdivisions of t he ungulates, it is suggested to divide 
the Ancylopoda into the Artionychia and Perissonychia. 
The Evolution of Teeth in Mammalia in its bearing upon tin Problem <>f 
Phytogeny. By Henry Fairfield Osborn. (Trans. X. Y.Acad. Sci.. 
vol. xn. p. 1ST.) The following abstract of Dr. Osborn's paper is given. 
He reviews the recent researches and theories of Kiikenthal, Rose and 
Tacker, upon the formation and succession of the dental series in mam- 
malia, and points out thai especially in marsupials, cetaceans and eden- 
tates (with other pi a cent ales), the existence of two series of teeth is now 
abundantly proven, as well as the fact that homod<mt forms were de- 
rived from early heterodont. Recenl discoveries indicate that in marsu- 
pials teeth of the second series mighl be interposed in the firsl series: 
thus explaining the typical dentition of such genera as Didelphia. This 
transposition permits a comparison of the dentition of marsupials with 
that of Jurassic mammalia (i 4, c j, p |, m |). 
It is further noted that the triconodonl type (as Anphilestes) max be re- 
garded as the hypothetical point of divergence of placental mammalia. 
As to the form of teeth crowns, the th 'J' (Kiikenthal. Rose) that the 
complex mammalian types were made by concrescence of simple reptil- 
ian cusps, is, upon the evidence of the Jurassic mammalia, shown un- 
tenable, — as well as the converse theorj that cetaceans have derived 
hoinodynanious forms b\ the splitting of the cusps of the triconodonts. 
Contributions to the Anatomy of Dinichthys. !!\ Bashford Dean, Ph. I>. 
(Trans. X. V. Acad. Sci.. \ol. xn. pp. 187, 188.) In this paper the 
author has •■correlated t hi' parts of i his Devoniau- Lower Carboniferous 
arthrodiran with those of Coccosteus. Notes are made on the disposition 
and characters of the lateral line of organs, pineal foranieu, nasal cap 
sides, den i an plates, ginglymoid articulation of lateral shoulder plate-,. 
