“There are two groups of European Jews, the Ashkenazim and the Sephardim, who differ in physical characters. When it is said that a person has a Jewish appearance, the speaker usually has persons of Ashkenazic stock in mind. The members of this group are the typical Jews of Russia, Poland, and England, and they constitute the great majority, perhaps 90%, of all the people in the world to whom the name of Jews is applied (cf. Jacobs [545] and Ripley[905]).
[…]
Typically the Ashkenazim are brachycranial, though some of them fall within the range of the mesocranial. The relative breadth of the skull is produced in a special way. In several ethnic taxa the brachycranial condition arises simply from the fact that the head is particularly broad, but this is not so here. It is caused by the head being very short, the cranial capacity being maintained by the unusual height of the vertex. The shortness of the head is due to the suppression of the occipital region. A skull of this type is said to be hypsibrachycranial. An example is shown in Fig. 32B, which should be compared with the skull in Fig. 28C. In some cases the impression is given in side view that the back of the head has been sliced off by a vertical cut (cf. Fig. 33B, p. 240). The forehead is special in two respects. It tends to recede rather noticeably (Fig. 33B), and also to be rounded in the horizontal plane (Fig. 32A), instead of being squared off on each side, as it is in certain types of head, in which the forehead is almost rectangular in horizontal section. Thus in the Ashkenazim the front and sides of the head tend to curve smoothly upwards to a high vertex. In front view the face is seen to be rather wide above and narrow at the rounded chin, which somewhat recedes.
The upper and lower eyelids, especially the latter, tend to be somewhat puffed out. The iris is large. The ear is large, wide in its upper part, and provided with a large lobe.
The mouth is large. The lower lip is everted so as to appear thick, but it is not swollen out like that of a Negro; on the contrary, it tends to be rather flattened (Fig. 33A).”
— from Chapter 14 of the book “Race” (Athens, Georgia; Foundation for Human Understanding, 1981) by Dr. John R. Baker