128 Reviews—Mammoths and Mastodons. 
IV.—Mammorus anp Masropons. By W. D. Marruew. No. 43 
Guide Leaflet, American Museum of Natural History, November, 
1915. 
[* this guide leaflet Dr. Matthew has given a very interesting 
outline of our present knowledge of the Proboscidea, referring 
especially to the specimens exhibited in the American Museum of 
Natural History. He commences with a short historical account of 
the early discoveries of elephant remains, and then passes on to a brief 
description of the various extinct elephants, the American Mastodon, 
and the Tertiary Mastodons, concluding with a discussion on the early 
ancestors of the group and the general course of its evolution. One 
of the most interesting sections is that relating to the American 
Tertiary Mastodons, concerning which much more information than 
has yet been published is desirable. The author revives several 
forgotten generic names, e.g. Gomphotherium and Rhynchotherium, im 
the last case mentioning no species. Probably, however, the species 
described in this Magazine ([5] Vol. VI, p. 347, 1909) under the 
name Tetrabelodon dinothertoides should be placed here, the 
symphysial part of the mandible being deflected in the manner said 
to be characteristic of the genus. Jeritherium is not regarded as a 
direct ancestor of the Proboscidea, but, although it may be a side 
branch, its Proboscidean affinities appear to be incontestable. 
The pamphlet is illustrated with a plate and eleven text-figures. 
V.—New Evryrrerrp Horton.—A Eurypterid in the Barton 
Beds! Sounds startling. And a coral-reef too!—Gently, gentle 
reader, these Barton Beds are in North America. Oh! But then, 
you will say (after some research) they are Stevenson’s Barton group 
in the Carboniferous of Pennsylvania. No, they are in Ontario, south 
of that superbly patriotic city Hamilton, and they lie at the very top 
of the Niagara formation. Fortunately Mr. M. Y. Williams (Oct., 
1915, Canada Geol. Surv. Mus. Bulletin, No. 20) now proposes for 
them the name Eramosa beds, because their dark bituminous dolomites 
and shales are well exposed along the Eramosa River between 
Rockwood and Guelph. The importance of these beds lies in their 
paleontological evidence of a conformable passage from the Niagara 
to the Guelph formations. The Eurypterid, Husarcus logant, n.sp., is 
based upon various fragments, and since these are associated with 
fossils of marine origin, Mr. ‘Williams believes that the, arthropods 
‘‘lived in an entirely - marine habitat ’’, a conclusion that would have 
been less open to criticism had the fragments been less fragmentary. 
In the descriptions of species contained in these excellent Bulletins, 
would it not be possible to give some indication of their systematic 
position? How many geologists, or even professed paleontologists, 
ean say off-hand what ZLichenalia concentrica is? Mr. Williams tells 
them that the surface is undulatory and bears radial and concentric 
strie about 0°5 mm. apart; but he leaves them to their own devices 
to find out that it is a Wace pare 3S Bryozoan, closely allied to 
Listulipora. 
it i me el it tarts ee a ee, 
