APPENDIX. S51 



ORDER IV. PlNNIPEDIA. 



Mammge abdominal; penis attached to the belly: feet very- 

 short, covered by a skin formed for swimming, the posterior 

 turned backward. 



Family 9. Pinnipedia. 



§§ Not more than two kinds of teeth. 



ORDER V. Glires. 



No canine teeth; incisive 2 below, 2, 4, or 6 above; 22 

 molar at most; jaws moving horizontally. 

 * Females with a pouch; both sexes with marsupial bones. 

 Family 10. Marsupialia.(l) Incisive 2 or 6 above. 

 ** No pouch, no marsupial bones, 

 t Clavicles distinct omnivorous. 

 Family 11. Murina. 



tt Clavicles rudimental. Herbivorous. 

 Family 12. Aculeata. Skin covered with prickles; up- 

 per incisors 2; toes 4-5. 



Family 13. Duplicidentata. Skin covered with hair; 

 upper incisors 4, (6 in young subjects;) toes 5-4. 



Family 14. Subungulata. Skin covered with hair; upper 

 incisors 2; molars 16; posterior toes 3 or 5, but lateral each 

 side, very small. 



* 5 toed. ** 4-3 toed. 



ORDER VI. Bruta. 



No canine nor incisor teeth; (except in one genus in 

 which there are 4 below;) from 14 to 98 molars, or none; 

 nails enveloping the extremities of the digits, almost hoop 

 shaped. 



(1) We scatter the marsupial animals, as naturally they should be sepa- 

 rated: their resemblance being merely of analogy and not of affinity, 

 two things often confounded in natural history. 



