840 STRATIGRAPHICAL GEOLOGY. [Boo VI. 
globe. Characteristic forms are Belosepia, Nautilus, Canceellaria, 
Fusus, Pseudoliva, Oliva, Voluta, Conus, Mitra, Cerithium, Melania, 
Turritella, Rostellaria, Plewrotoma, Cyprza, Natica, Scalaria, Corbula, 
Cyrena, Cytherea, Chama, Lucina. Fish remains are not infrequent 
in some of the clays, chiefly as scattered teeth (Fig. 404). Some of 
the more common genera are Lamna, Otodus, Myliobates, Pristis, 
Phyllodus, Aetobates. The Eocene reptiles present a singular con- 
trast to those of Mesozoic time. They consist largely of tortoises 
and turtles, with crocodiles and sea-snakes. An interesting series of 
remains of birds has been obtained from the English Eocene beds. 
These include Argillormis longipennis (perhaps representative of, but 
larger than, the modern albatross), Dasornis londinensis (somewhat 
akin to the extinct Dinornis of New Zealand), Enaliornis, Haleyornis 
toliapicus, Lithornis vulturinus, Macrornis tanaupus, Odontopteryx tolia- 
picus (a toothed, fish-eating bird with affinities to the pterosaurians). 

Fic, 402.—EocrenE LAMELLIBRANCHS. 
a, Cardium porulosum (Lam.); b, Corbula regulbiensis (Mor.); ¢, Lucina squamula 
(Desh.); d, Cyrena cuneiformis (Sow.) (3). 
From the upper Eocene beds of the Paris basin ten species of birds 
have been obtained, including forms allied to the buzzard, woodcock, 
quail, pelican, ibis, flamingo, and African hornbill.t But the most 
notable feature in the paleontology of the period is the advent of 
some of the numerous mammalian forms for which Tertiary time was 
so distinguished. Inthe lower Hocene period appeared the Arctocyon 
and Palxonictis, two animals with marsupial affinities, the former 
with bear-like teeth, the latter with teeth like those of the Tasmanian 
dasyure ; also the tapir-like Coryphodon ; the small hog-like Hyra- 
cothertum with canine teeth like those of the peccary, and a form 
intermediate between that of the hog and the hyrax; and the allied 
genus Pliolophus. Middle Eocene time was distinguished by the 
advent of a group of remarkable tapir-like animals (Paleotheriuwm, 
Palaplotherium, Lophiodon, Pachynolophus) ; true carnivores (Pterodon 
and Proviverra); forms allied to hogs and carnivores (Heterohyus, 
&e.); and the lemuroid Ccnopithecus, the earliest representative 
* Owen, Q. J. Geol. Soc. 1856, 1873, 1878, 1880. Boyd Dawkins, Barly Man in 
Britain, p. 33. Milne Edwards, O/seauax Fossiles, ii, 543. 
