58 CLASS T. ORDER V. 
5 on each side; in lower jaw 4: having collar 
bones. | 
Sciurus, (squirrel,) incisors in upper jaw 
wedge-form, in lower jaw sharp; grinders 5 on 
each side in upper Jaw, 4 in lower jaw; having 
collar bones ; tail spreading towards each side in 
most species. : 
Hysrrix, (porcupine,) incisors 2, both in up- 
per and under jaw, obliquely cut; grinders 8; 
body covered with spines intermixed with hair ; 
4 toes to each fore foot, 5 to each hind foot. — 
Lervs, (hare, rabbit,) incisors 2 above and 2 
below, the upper pair duplicate; two small in- 
terlor ones standing behind the exterior. 
Cavia, (guinea-pig, india-pig,) incisors 2, 
wedge-form; grinders 8; toes 4 or 5 to each fore 
foot, to each hind foot 3 to 53 tail none or very 
short ; collar bones, nene. 
ORDER 5. EDENTATA. 
Having no incisors, and having hoof-like nails. 
Braviews, (sloth,) cutting teeth none in either 
jaws; canine teeth obtuse, single, longer than the 
grinders placed opposite; grinders 5 on each side, . 
obtuse ; fore legs mach longer than the hind ones ; 
claws very long. 
Mercarueniom, (extinct genus,) teeth ilat-top- 
ped; forelegs equal in length to both head and 
neck ; claws long. Intermediate in character be- 
tween Bradypus and Dasypus. 
Dasyrvs, (armadillo,) grinders several, without 
either the cutting or canine teeth 5; body coated 
with a shelly armour, divided into zones. 
Myrmecopuaca, (ant-eater,) teeth none; tongue 
cylindric, extensile ; mouth lengthened into some- 
what tubular form ; body covered with hair, 
