466 
NATURE 
[Marcu 18, 1897 
gnathus, and the fierce A//osaurus and Megalosaurus. 
These beasts of prey assumed the erect position, not 
only to observe, but also to rapidly overtake and leap 
upon their quarry ; and it may be, too, that they were 
able to deceive them by their superficial resemblance to 
the vegetarians, who were literally taken in by them. 
We cannot, in so brief a notice, do justice to the 
Recent. 
statement that Marsh had discovered an animal with its 
brain in its tail! “‘ This reminds me ”—I was asking the 
late Captain Speke on his return, in 1864, from Somali- 
land, what he thought of the Somalis, to which he replied, 
“They are a splendid race of men, only, unfortunately, 
their brain is developed at the wrong end of their back- 
bone.” 
Tapir, Peccary, Bison. 
ae | 
| 
| 
| 
| 
| Known Range 
o’ Dinosaurs in 
Time. 
| 
Quaternary. Bos, Equus, Tapir us, Dicotyles, Megatherium,Mylodon. 
Equus, Tapirus, Elephas. 
5 a 
iPifiergevare Equus Beds. § Pliohippus, Tapiravus, Mastodon, Procamelus, 
? Pliohippus Beds. i Aceratherium, Bos, Mcrotherium, Platygonus. 
Miohippus Beds Miohippus, Diceratherium, Thinohyus, Protoceras. 
; * PP : { Oreodon, Eporeodon, Hyenodon, Moropus, Ictops, 
bs) Miocene. |Oreodon Beds. ( Hyracodon, Agriochwerus, Colodon, Leptocharus. 
Ss 3 . § Brontotherium, Brontops, Allops, Titanops, Titano-| 
£ Brontotherium Beds (therium, Mesohippus, Ancodus, Entelodon.. 
Oo a 7 | SS es 
al Diplacodon Beds, |Diplacodon, Epihippus, Amynodon, Eomeryx. 
. 4 Dinoceras, Tinoceras, Tintatherium, Paleosyops, 
2 Dinoceras Beds, { Orohippus, Hyrachyus, Colonoceras, Homucodon. 
Eocene. ; ; : , 
Heliobatis Beds. Heliobatis, Amia, Lepidosteus, Asineops, Clupea. | 
nt Coryphodon,Eohippus, Eohyus, Hyracops, Parahyus 
Coryphodon Beds. apne Ungulates, Tillodonts, Kodents, Serpents. | 
. “i Ceratops, Triceratops, Claosaurus, Ornithomimus 
Taran’ peat Ox: Mammnals, Cimolamys, Dipriodon, Selenacodon, 
Cera OPS <I S. Nanomyops, Stagodon. Biras, Cimolopteryx. 
Fox Hills Group. | 
Cretaceous. Colorado Series, or |Birds with Teeth, Hesperornis, Ichthyornis, Apatornis 
Mosasaurs, Edestosaurus, Lestosaurus, Tylosaurus. 
S Pteranodon Beds. _[Pterodactyis, Pteranodon. Plesiosaurs, Turtles. 
S Dakota Group. 
n = = a = ee :. : ey 
9g Atlantosaurus Beds) } Dinosaurs, Byontosanrus, Morosaurus, Diplodocus. 
a Jurassic. |Baptanodon Beds. || Stegosaurus,Camptosaurus, Ceratosaurus. Mam- 
llopus Beds, muls, Dryolestes, Stylacodon, Tinodon, Clenacodon 
allop 
First Mammals, Dromatherium. First Dinosaurs.| 
mMpneeie Otozoum, or Anchisaurus. Ammosaurus, Bathygnathus, Clepsy- 
>| triassic. Coun. River, Beds. |saurus. Many footprints. Crocodiles, Belodon. 
Fishes, Catopterus, Ischypterus, Ptycholepis. 
aera, Nothodon Peds. Reptiles, Vothodon, Lryops, Sphenacodon. | 
- |First Reptiles (?) Zosaurus. Amphibians, Baphetes, 
_ Sass SSS ; 
TS Coal Measures, or |Dendrerpeton, Hylonomus, Pelion, Footprints, 
———————S—S— ae ‘A Eosaurus Beds. |Avthracopus, Allopus, Baropus, Dromopus, Hylopus, 
| c---7—77HH r 5 , 
| Carboniferous Limnopus, Nasopus. 
SSS . 
SSUES z Subcarboniferous First known Amphibians (Labyrinthodonts). 
é or Sauropus Beds Footprints, Sauropus, Thenaropus. 
ne Ss. 
Dinichthys Beds. Dinichthys, Acanthodes, Bothriolepis, Chirolepis, 
A Devonian. Cladodus, Dipterus, Titanichthys. | 
Lower Devonian 
is} = — zs = 
Ss : Z 
=) = . : 
SI Upper Silurian. 
3 Sigaa First known Fishes. 
a 
Lower Silurian. 
Cambrian. | Primordial. 
Huronian. 
No Vertebrates known, 
Archwan. —|Taurentian, 
Fic. 8.—Tab le of British strata, with their North American equivalent: 
s, and a list of the vertebrate fossils which are found in them in the United 
States; drawn up by O. C. Marsh. 
labours of Prof. Marsh in this interesting field of inquiry ; | 
but those who care to take up this latest volume on 
Dinosaurs, will find it well repay the perusal. His 
studies of the brains of these ancient reptiles is alone 
deserving most careful consideration. The comparison 
of the brain of Stegosaurus ungulatus, with the enor- 
-mously larger neural cavity in the sacrum, has led to the 
NQ. 1429, VOL. 55] 
The present work by Prof. Marsh is, after all, but a 
summary of more than fifteen years’ labour in the field 
and in the museum, and may, it is hoped, be followed by 
even a larger monograph. Nevertheless this volume 
_is a storehouse of facts and figures (there are eighty- 
_ four plates !), and will prove of the greatest value to the 
| paleontologist and the biologist. 
| 
