Divisions Of The Parietal Bone In Man And Other Mammals

Author : Ales Hrdlicka
Publisher : Rarebooksclub.com
ISBN 13 : 9781230170565
Total Pages : 46 pages
Book Rating : 4.1/5 (75 download)

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Download or read book Divisions of the Parietal Bone in Man and Other Mammals written by Ales Hrdlicka and published by Rarebooksclub.com. This book was released on 2013-09 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...is 1.35 cm. long and directed forward and very slightly downward, running almost parallel with the squamous suture. The skull is quite symmetrical. The bones are all very thin in spots. Temporal ridges indistinct. The left parietal bone is somewhat higher than the right one, while the length of the two is nearly the same. Infero-superiorly at middle left 4.8, right 4.65 cm. Antero-posteriorly at middle "4.7 "4.7" IV. Rssum1i. Numbers.--Among the 391 Old World and American monkeys examined by me 52, or 13.3 per cent., show some form or other of anomalous parietal division. According to the species of the monkeys, the proportions of cases with division are as follows: Among the 17 previously reported cases of monkeyswith complete or incomplete parietal divisions, there are 13 Old World (1 Cynocephalus, l 8 Cercopitheci, 3 Macaci, and 1 Semnopithecus) and 4 New World monkeys (2 Cebi, 1 Mycetes, 1 Arctopithecus = Hapale). The Old World monkeys show in general a considerably larger proportion of complete, but a smaller proportion of incomplete, divisions than the American ones. If we count all the divisions together, their proportions in my two series of cases (there are no data as to the number of cases examined in other instances) are almost equal (12.8 % in the Old World, 14.4 % in the American monkeys); but such a combination and comparison are not fully justifiable: they would imply an equivalence of the divisions which cannot thus far be clearly proven. The proportion of the anomalies under consideration differs quite markedly in the various species of monkeys. Divisions of various nature are comparatively very frequent in the Macaques, particularly the Macacus rhesus, and quite frequent in the Cebi and Ateles, but rare in...