. Elementary text-book of zoology. S66 CHORD ATA. progressive changes, be noticed the gradual assumption of a digitigrade method of walking from the primitive planti- grade. Special allusion has been made to most of these points in dealing with the horse and ox. The intestine is always long, the uterus is usually of the bicornuate type and the placenta is non-deciduate and either zonary, diffuse, or cotyledonary. SUB-ORDER I.—CONDYLARTHRA. The members of this sub-order are all extinct and they represent the very lowest point of the ungulate stock. They have the typical eutherian dentition of f
. Elementary text-book of zoology. S66 CHORD ATA. progressive changes, be noticed the gradual assumption of a digitigrade method of walking from the primitive planti- grade. Special allusion has been made to most of these points in dealing with the horse and ox. The intestine is always long, the uterus is usually of the bicornuate type and the placenta is non-deciduate and either zonary, diffuse, or cotyledonary. SUB-ORDER I.—CONDYLARTHRA. The members of this sub-order are all extinct and they represent the very lowest point of the ungulate stock. They have the typical eutherian dentition of f ^|-| and the molars Fig. 386.—Lateral View of of Daman {H\ rax syriacns).. Note the rodent-like incisors, absence of canines and long row of seven grinding premolars and molars. The malar bone is seen to extend back to the glenoid cavity. were of simple brachydont structure. The hmbs were planti- grade, with five toes, and the carpal and tarsal bones were serial. The fibula and ulna were not reduced, though the latter had already lost its connection with the calcaneum. The femur had a third trochanter, as in The tail was long. The humerus, contrary to that of other Vngulata, had an entepicondylar foramen, resembling that of Carnivora. The toes appear to have borne blunt claws rather than hoofs. Phenacodus is the best known genus to which the modem horse, and hence Perissodactyla, can. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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