Doubtless from among all these diverse forms there have been not a few which sought wider opportunities in the water, but, if so, we have as yet very little knowledge of them. One form only, so far as the writer is aware, has been credited with aquatic habits, a remarkable reptile belonging to the group originally called by Sir Richard Owen, the Anomodontia, a word meaning “lawless teeth,” and to the genus _Lystrosaurus_, also described by the same noted paleontologist. A restoration of the skeleton of _Lystrosaurus_ has recently been published by Watson. This restoration the writer has reproduced in the present pages, though he has taken the liberty of making some minor changes, to accord better with what he believes must have been the position of the shoulder-blades and the hind legs. And he would also suggest that the tail in life did not turn down so much at its extremity as depicted by Watson. Both Broom and Watson believe that this animal was a powerful swimmer, and thoroughly aquatic in habit. To the present writer, however, this does not seem so evident. He is rather inclined to believe that the creature was chiefly terrestrial in habit, living probably in marshy regions, and perhaps seeking its food in shallow waters and in the mud. Aside from the position of the nostrils, which it will be observed are rather close to the eyes, a position so characteristic of many swimming reptiles and mammals, there is but little indication of aquatic adaptations elsewhere in the skeleton. [Illustration: FIG. 50.—Skeleton of _Lystrosaurus_, as restored by Watson, slightly modified.] The skull is of most extraordinary form. The face is turned downward, leaving the nostrils high up, in front of the eyes. The jaws were doubtless covered with a horny shield, like that of the turtles, having a cutting edge. There is a single pair of elongated canine teeth, possibly a sexual character. The lower jaws are heavy and stout, and Watson has said that the animal doubtless had the ability to open its mouth very widely. The quadrate, the bone with which the lower jaws articulate, is firmly fixed to the skull, and there is a single opening on the side of the skull posteriorly, a character common to all the Therapsida.