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right side of the skull! The sut. par. runs over the whole left parietale 
and still continues a little way on the squamosum. It begins near 
the sut. sagit., and ends on the piece of bone just mentioned. The 
course of the abnormal suture is characterized by two large bends, 
an upper, larger and rounder one and a lower, smaller and sharper 
one. Besides the rare abnormality of the sat. par. on this skull, we 
also find here that this suture runs on quite over the sut. squam., 
an abnormality which is much rarer still. Indeed, in 1903 no monkey 
skull had yet been described which showed this, and only two human 
skulls, one by Zosa and one by Graf von Spee. We can find the 
latter case from von SpxE (6). mentioned on p. 114 and 115. 
Hrpuicka (3) in 1903, describes the first examples of it in Monkeys 
and finds this very rare abnormality 7 times on 410 skulls. I do 
not know any more cases of it nor have | found them anywhere in 
literature. So this case of Macacus nemestrinus is the 8th monkey- 
skull described which showed this, and the first of this species of 
monkeys. The seven cases of HRDLIOKA are to be divided as follows: 
Of: Macacus rhesus, found 4 times, | among 
Of: Cebus albifrons, found once, | 410 
Of: Cebus hypoleucos, found once, monkey 
and of: Cercopithecus callitr., found once, | skulls. 
So: from the 7 cases, 4 of Macacus rhesus! And now I once 
more call to mind the fact that also of Macacus rhesus, the suture 
parietalis has been found by Hrpııöka, 24 times from the 53 times 
total. (See about this higher-up.) From this appears, that the sut. 
par. by itself and the cases in which this suture runs through on the 
squamosum, occur deeidedly most in Macacus rhesus, namely with 
very convincing figures: 24 from the 53 cases and 4 from the 7 cases. 
To be sure the conditions for the origin of the sut. par. of the mon- 
keys are not yet known, but the matter becomes still more mysterious 
when the dividing of the os parietale continues on the squamosum, 
How can we explain this? Graf von Spxx (6) already speaks about 
this and says (p. 114, and 115): „Bleiben die beiden Ossifikations- 
bezirke unverwachsen, so veranlasst dies die sehr seltene Anomalie 
des durch eine sagittale Spalte geteilten Scheitelbeins (Os parietale 
bipartitum). Für Spalten des Scheitelbeins, die das Gebiet des 
Planum temporale teilen, gibt die typische Entwicklung des Scheitel- 
beins aus zwei Knochenpunkten, soweit ich ersehe, keine Erklärung.“ 
And a little further the author thinks that we must perhaps take 
