38 REPORT OF NEW JERSEY STATE MUSEUM. 
(3) The Eutheria or modern mammals comprising all the 
familiar species found to-day in all parts of the world, except the 
Australian region. 
In New Jersey we have, of course, no representatives 
of the Prototheria, while the Marsupialia are represented 
only by the common oppossum. Of the Eutheria, we 
have numerous examples, although several of the orders are 
entirely wanting, as for instance, those comprising the ele- 
phants, sloths and monkeys. Remains of some of these, how- 
ever, occur as fossils, in deposits in different parts of the State; 
the most familiar being the great mastodon, a close relative of 
the elephant, whose gigantic skull, teeth and tusks are now and 
then brought to light when excavations are being made in the 
earth. The several orders of mammals that are represented in 
the New Jersey fauna may be distinguished as follows: 
a. Young born at a very early stage of development and reared in a pouch 
on the belly of the female. MARSUPIALIA (Opossum) 
aa. Female not pouched. EUTHERIA 
b. Aquatic, with no hind legs; fore legs modified into flippers for 
swimming. CETACEA (Whales, etc.) 
bb. Terrestrial (except seals and bats), all four limbs developed, and body 
thickly covered with hair. 
c. Nails developed into hoofs. UNGULATA (Deer, etc.) 
cc. Nails compressed and hooked, forming claws. 
d. Incisor (or front) teeth very prominent, two in each jaw, a 
gap on each side separating them from the molars or back 
teeth. GLIRES. (Rats, etc.) 
dd. Incisors small, generally more than two; canine (or eye) - 
teeth present, filling the gap between the incisors and molars. 
e. Fore feet developed into wings. CHIROPTERA (Bats.) 
ee. Fore feet normal. 
f. Canines not prominent. INSECTIVORA (Shrews, etc.) 
ff. Canines prominent. | CARNIVORA (Wild Cat, Seals, etc.) 
