H. Obermaier[24] argues as follows: Homo primigenius is neither the representative of an intermediate species between ape and man, nor a lower or distinct type than Homo sapiens, but an older primitive variety (race) of the latter, which survives in exceptional cases down to the present day[25]. Clearly then, according to the rules of zoological classification, we must term the two, Homo sapiens var. primigenius, as compared with Homo sapiens var. recens.

Whatever classification or nomenclature may be adopted the dual division in palaeolithic times is now generally recognised. The more primitive type is commonly called Neandertal man, from the famous cranium found in the Neandertal cave in 1857, or Mousterian man, from the culture associations. To this group belong the Gibraltar skull[26], and the skeletons from Spy[27], and Krapina, Croatia[28], together with the later discoveries (1908-11) at La Chapelle[29] (Corrèze), Le Moustier[30], La Ferassie[31] (Dordogne) and many others.

Palaeolithic examples of the modern human type have been found at Brüx (Bohemia)[32], Brünn (Moravia)[33] and Galley Hill in Kent[34], but the most complete find was that at Combe Capelle in 1909[35]. The numerous skeletons found at Cro-Magnon[36] and at the Grottes de Grimaldi at Mentone[37] though showing certain skeletal differences may be included in this group, the earliest examples of which are associated with Aurignacian culture[38].

From the evidence contributed by these examples the main characteristics of the two groups may be indicated, although, owing to the imperfection of the records, any generalisations must necessarily be tentative and subject to criticism.

The La Chapelle skull recalls many of the primitive features of the "ancestral types." The low receding forehead, the overhanging brow-ridges, forming continuous horizontal bars of bone overshadowing the orbits, the inflated circumnasal region, the enormous jaws, with massive ascending ramus, shallow sigmoid notch, "negative" chin and other "simian" characters seem reminiscent of Pithecanthropus and Homo Heidelbergensis. The cranial capacity however is estimated at over 1600 c.c., thus exceeding that of the average modern European, and this development, even though associated, as M. Boule has pointed out, with a comparatively lowly brain, is of striking significance. The low stature, probably about 1600 mm. (under 5½ feet) makes the size of the skull and cranial capacity all the more remarkable. "A survey of the characters of Neanderthal man—as manifested by his skeleton, brain cast, and teeth—have convinced anthropologists of two things: first, that we are dealing with a form of man totally different from any form now living; and secondly, that the kind of difference far exceeds that which separates the most divergent of modern human races[39]."