{ Catodontidæ 38. Catodontidæ. { { { Hyperoodontidæ. { Hyperoodontidæ 39. { Epiodontidæ. { { Xiphiadæ. { Sub-order II.-- { Monodontidæ 40. (Part of Delphinidæ.) Odontoceti { { { Platanistidæ. { { Iniadæ. { { Delphinidæ. { Delphinidæ 41. { Globiocephalidæ. { Orcadæ. { Belugidæ. { Pontoporiadæ. Extinct family Zeuglodontidæ. Order--SIRENIA. The order Sirenia, comprising the sea-cows, consists of a single family: Family 42. Manatidæ. The extensive order Ungulata comprises the three orders Pachydermata, Solidungula, and Ruminantia of the older naturalists. The following classification is that now generally adopted, the only difference of opinion being as to whether some of the groups should be classed as families or sub-families, a matter of little importance for our purpose: Order--UNGULATA. Fam. Perissodactyla or } 43. Equidæ Horses. Odd-toed Ungulates } 44. Tapiridæ Tapirs. 45. Rhinocerotidæ Rhinoceros. { Suina { 46. Hippopotamidæ Hippopotamus. { { 47. Suidæ Swine. { Artiodactyla or { Tylopoda 48. Camelidæ Camels. Even-toed Ungulates { { Tragulina 49. Tragulidæ Chevrotains. { { { 50. Cervidæ Deer. { Pecora { 51. Camelopardidæ Giraffes. { 52. Bovidæ { Cattle, Sheep, { Antelopes, &c. {90}The two next orders consist of but a single family each, viz.: Order Fam. PROBOSCIDEA 53. Elephantidæ Elephants. HYRACOIDEA 54. Hyracidæ Rock-rabbits.