286 Sir John Lubbock’s Address. 
leged to descend into the interior of the earth, and have 
éuereiasd areas imagination in recounting the wonders there 
revealed. S in other cases, however, the realities of science 
vealed to us by far the greatest number. have been lewecbal 
during the period now under review. For instance, the gigan- 
tic Cetiosaurus was described by Owen in 1838, the Dinornis of 
New Zealand by the same distinguished naturalist in 1839, the 
Mylodon in the same year, and the Archopteryx in 
n America, a large number of remarkable forms have been 
described, mainly by Marsh, Leidy and Cope. Marsh has made » 
known to us the ‘Titanosaurus, of the American (Colorado) 
Jurassic beds, which is, perhaps, the largest land animal yet 
known, being a hundred feet in length, and at least thirty in 
height, though it seems possible that even these vast dimen- 
sions were exceeded by those of the Atlantosaurus. Nor must 
I omit the Hesperornis, described by Marsh in 1872, as_a car- 
hivorous, swimming ostrich, provided with teeth, ‘which he 
regards as a character inherited from reptilian ancestors ; the 
Ichthyornis, stranger still, with biconcave vertebra, like those 
of fishes, and teeth set in sockets ; while in the Eocene deposits 
in the Rocky Mountains the same indefatigable paleontologist, 
among other very interesting remains, has discovered three 
new groups of remarkable oe the Dinocerata, Tillodon- 
tia, and Brontotherids. He has also described a number of 
small, but very interesting, Jurassic mammalia, closely ae 
to those found in our ee Slate and Purbeck beds, 
which he has proposed a new order, *‘ Prototheria.” Lastly, a 
may mention the oes anomalous Reptilia from Sout 
sai which have been made krown to us by Professor 
wen 
is the law of brain- ciecseeile t is not only in the igher mam- 
existing, say, in Miocene times. The rule is almost general 
at—as Marsh has briefly stated it— ‘all tertiary animals 
Shy 
than those of our own rf and the Sain obaasine of the Dino- 
sauria of the Jurassic period, are much smaller than in any 
existing reptiles. 
s giving, in a few words, an idea of the rapid progress in 
this department, I may mention that Morris’s “ Catalogue of 
British Fossils,” published in 1848, contained 5,300 s species ; 
while that now in preparation by Mr. Etheridge enumerates 
5,000. 
