20 The West American Scientist. 
simplex from Utah, and three others from Colorado. There is 
also an account of the occurrence of the Chinch Bug in consider- 
able numbers in California, where, however, it is not yet known 
to do damage. No. 2 contains, among other things, an account 
of the Morelos Orange Fruit-worm, which proves to be the larval 
of a fly-trypeta ludens. The only notes in this number dealing 
specially with the West are on depredations supposed to be those 
of the Western Cricket in Colorado, and a notice of the larval 
habits of Dicerca in the same State. i 
T. DAC. 
W. G. SmitH. On the nesting of Audubon’s Warbler (D. au- 
duboni), in Larimer Co., Colorado, in ‘‘ Orn. & Ool.,”’ 1888, p. 
EA: 
T. D. A. CocKERELL. On the distribution of Aquatic Forms. 
‘Science Gossip,’ 1888, p.182. In this paper the freshwater plants 
and marine shells and algce of California are compared with those 
of Europe, and conclusions drawn. Thereare also various other 
remarks on Western species. 
ON THE MESOZOIC MAMMALIA. 
For a number of years past Professor Henry F. Osborn of 
Princeton College, has been assiduously devoting himself to the 
study of the taxonomy and morphology of the Mesozoic Mamma- 
lia, and in these investigations, this eminent paleontologist has 
been materially assisted by having been allowed the free use of 
the invaluable collections formerly utilized by Professor Sir Richard 
Owen, and now preserved in the British Museum, as well as the 
collections of Dr. Lemoine, of Rheims, and the American collec- 
tions of Cope and Williams College. Enjoying such opportuni- 
ties as these, and worked over by such a hand, we naturally look 
for more than ordinary results, and science is by no means dis- 
appointed in the matter. Professor Osborn’s labors now come 
before us in the form of a magnificent royal quarto monograph 
of some seventy-five pages, and published by the. Academy of 
Natural Sciences of Philadelphia, (Vol. IX, No. 2, July, 1888.) 
It is illustrated by thirty wonderfully clear woodcuts in the text, 
and two very fine lithographic plates, the handiwork of the fam- 
ous house of Sinclair & Son, whichis sufficient guaranty of their 
excellence. These drawings are all devoted to either the jaws or 
the dentition of the group under consideration, and amply illus- 
trate the remarks of the author. 
Formerly it was generally supposed by paleontologists, that 
the mammalian fauna of the Mesozoic period were of very lim- 
ited number, as so late as 1871, Professor Owen, in his well- 
known monograph, described but twenty genera, while in the 
