Osteologically the Sloths and Anteaters are united by the fact that the coracoid becomes fused with the coracoid border of the scapula, thus forming a foramen; the importance of this character is, however, discounted by its occurrence in three genera of Cebidae. The above facts embody the views of Sir William Flower.[101] {165} A subsequent study of the brain and of the muscles of these animals has led to results not entirely in harmony with these views. Dr. Elliot Smith is of opinion,[102] after an exhaustive study of the Edentate brain, that in this region of the body the present group shows very decided points of likeness to the Carnivora; that is, so far as concerns the Anteaters. On the other hand, _Orycteropus_ is as distinctly comparable with a primitive Ungulate type, such as is exemplified by _Moschus_. "If the brain of _Orycteropus_," he remarks, "were given to an anatomist acquainted with all the other variations of the mammalian type of brain, there is probably only one feature which would lead him to hesitate in describing it as an exceedingly simple Ungulate brain. That one feature is the high degree of macrosmatism.[103] _Manis_, on the other hand, does not come especially near to _Orycteropus_. The brain of _Manis_ conforms to a simple type of architecture, which agrees in many points with both those of _Orycteropus_ and the American Edentates; there is not sufficient evidence to show which type it really favours." Elliot Smith would, in fact, agree with Max Weber that it is better, if a division is to be made, to divide the group into three orders:--the Xenarthra (Sloths, Anteaters, and Armadillos), Tubulidentata (_Orycteropus_), and Squamata (_Manis_), instead of into Xenarthra and Nomarthra. Messrs. Windle and Parsons[104] are disposed to see in muscular similarities reasons for uniting _Manis_ with the American Edentates, though they confess to being unable to place _Orycteropus_; in this animal, they say, "we are more struck by the generalised mammalian arrangement of its muscles than by any special Edentate characters. There are, however, two muscles in _Orycteropus_ which show peculiarities not found elsewhere than in the Edentates";--the triceps, which has more than one scapular head, and the tibialis posticus, which is double. They conclude that _Orycteropus_ "presents some feeble claims to be taken into the order." We shall here adopt the following divisions. {166} SUB-ORDER 1. XENARTHRA.