IV. ON THE OSTEOLOGY OF THE GENERA LASIOPYGA 

 AND CALLITHRIX WITH NOTES UPON THE OSTEOL- 

 OGY OF THE GENERA SENIOCEBUS AND AOTUS. 



By R. W. Shufeldt. C.M.Z.S. 



(Plates XII-XXI.) 



Not long since I had occasion to examine into the osteology of 

 some of the Old World apes and New World tamarins and marmosets, 

 and I soon discovered, that, although in times past much had been 

 published on this subject, there yet remained in the matter of detail 

 a great deal, which up to the present day has not been touched upon. 

 To be sure we have the works of Blainville, Owen, Flower, Giebel, 

 Huxley, Mivart, Vrolik, and many others, who have given us their 

 time-honored contributions in this important field, but in. the main 

 these are mostly of a general nature and not especially devoted to 

 detailed descriptions and comparisons. 



Recently we have had placed before us, however, the epoch-making 

 work of Dr. D. G. Elliot,^ who has long been engaged upon the biology 

 and taxonomy of the entire group of primates, for which sumptuous 

 production he has examined an enormous body of material, including 

 nearly all the principal types and material contained in private collec- 

 tions and in the great museums of the world, not to speak of what he 

 has gathered during his personal investigations in Afiica and elsewhere. 

 Dr. Elliot with great generosity has presented a copy of this work to 

 me, and in reply to a recent letter of inquiry states that " Callithrix 

 is the proper genus in which to place Ilapale jacchus," and that 'he 

 places Lasiopyga between the genera Rhinostigma and Miopithecus, 



2-2 i-i 3—3 2—2 



the tooth-formula of Callithrix being , , — -, = 32.' 



2-2 i-i 3-3 2-2 



It will be remembered that Mivart also states that "In the whole 



1 Three years have elapsed since the present paper was written, and it was only 

 a few months ago that I obtained the skeleton of Seniocebus meticulosus. The 

 brief description of the latter will therefore be given at the end of this article 

 under "Closing Remarks." In the same place I will also make reference to the 

 osteological data given by Dr. D. G. Elliot in his work, "A Review of the Primates" 

 (Monographs A. M. N. H., Vols. I-III, 1912), with respect to the skeletons of the 

 forms touched upon in this paper, including Aolus miriquoiiina, a skeleton of 

 which (no. 103,917) I have examined in the U. S. National Museum. 



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