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For the zoo-geographer only three separate sub-regions appear on the East-European plains the tundras, including the Arctic islands, the forest region, especially the coniferous part of it, and the Ante-Steppe and Steppes of the black-earth region.

The superior extremity of the tibia shows a central spine margined laterally by rather plain articular faces. It articulates with the thigh bone. The muscles of this region are divided into two sub-regions, anterior and posterior tibial.

In the superior portion of the limb the muscles are heavy, tapering inferiorly, and terminating in the region of the foot in long tendons. Each limb is divided into four regions. The regions of the fore-limb are the shoulder, arm, forearm and forefoot. In the hind limb are the regions of the pelvis, haunch, thigh, leg and hind-foot. The feet in turn are divided into three sub-regions each.

P. 265: You say that the Sittidæ extend to Madagascar, but there is no number in the tabular heading. P. 359: Rhinochetus is entered in the tabular heading under No. 3 of the Neotropical sub-regions. Reviewers think it necessary to find some fault, and if I were to review you, the sole point which I should blame is your not giving very numerous references.

The muscles of this region, the antibrachial, are divided into two sub-regions, anterior and posterior. They originate superiorly from the lower extremity of the arm bone and the superior extremities of the bones of the forearm, and terminate toward the lower extremity of the region in tendons that become attached to the bones of the knee, cannon and digit.