Page:Science vol. 5.djvu/525

 Jdne 12. 1886.1 SCIE

tertiary mammals ; and his results have been confirmed by Cope, Bruce, and othera, but by no one with such a wealth of illustration as by Professor Marsh. The lattcr's generalizations, however, are somewhat vogue, and not al- together novel, and in one case inaccurate. Professor Marsh says. ^ All tertiary mammals had smalt brains.' While such is the general law, it has conspicuous exceptions ; aa in the lemur Anaptomorphua, described and figured

��the Dinocerata, and will be read with great interest: and the two superb folding plates which illustrate this chapter have never been approached in the general accuracy of the sep- arate parts, or in the beauty of drawing. In the figure of Dinoeeraa, however, the hnmcrus is incorrectly drawn, and we believe that the fore-limb is too much flexed (compare plate 1'8. fig. 2).

The general conclusions form the least satis-

���I I

��by Cope, and in some mioccno mammals. Uf the latter TiYifessor !Slarsh's selection is not the best to bring out the facts. Aside from this. Professor JIarsIi's assemblage of facts is of the utmost importance, and well worthy of care fid study.

Chapters v. -xii. are taken up with full and accurate descriptions of the trunk, neck, and limbs. No point of importance is left in doubt, and we may be said to know the oste- olc^y of the Dinocerata almost as fliUy as that of any recent group of mammals. Such com- pleteness of malarial, and fulness of detail, con- stantly excite the reader's admiration.

Chapter xiii. deals with the restoration of

��factory section of the work. Lack of space forbids any full analysis of this chapter, but some portions of it demand notice. In the main, the scheme of classification of the ungu- lates here proposed agrees quite closely with that made by Professor Cope (Proc. Amer. phil. aoc., 1882, pp. 4.S5-447). though with some manifest improvements. No acknowledg- ment of this agreement is made, however, and the reader would not suppose that Cope bad ever written on the subject. When the latter proposed the order Amblypo<la, including Cory- phodon and the Dinocerata, Professor Marsh rejected it in these words: " A careftil consid- eration of the characters of Corj-phodon, so far

�� �