Shufeldt: Osteology of Lasiopyga and Callithrix. 59 



series of Old World apes we find the same number of different kinds 

 of teeth as in man," that is, sixteen in each jaw, or thirty-two in all; 

 but that " Cebidce have an additional premolar on each side of each 

 jaw, and the Ilapalina:, besides this, have a true molar the less." 

 These, as we know, are New World representatives of the grouj). 

 (cf. ISIivart, Article "Ape," Encyclopedia Britannica, 9th Ed., p. 164). 



Recently upon going over some of the osteological mateiial repre- 

 senting the primates at the United States National Museum, a privi- 

 lege foi which I have pleasure in thanking the curator of the Division 

 of Mammals, Mr. Gerrit S. Millei, Jr., and his assistant curator, Mr. 

 Ned HoUister, I found thai within recent years this collection has been 

 greatly increased; that long and vaiied series of skulls and skeletons 

 of many Old and New World primates are now to be found in it; and 

 that these are daily being augmented by accessions of a similar kind 

 from all parts of the world, where these animals find their habitats. 

 Much of this material still remains undescribed, although Mr. HoUister 

 has given us something upon it which has appeared in the Proceedings 

 of the Museum and elsewhere. I have to thank him for his kindness 

 in 'ooking up for me the synonymy of the species referred to in this 

 paper. 



Some years ago Mr. Edward S. Schmid of Washington presented 

 me with three monkeys in the flesh, one of these being a male Lasiopyga 

 griseoviridis (Desmarest) from northeastern Africa, and two adult 

 specimens of Callithrix jacchus (Linnaeus). Seveial years afterwards 

 Mr. Schmid very generously added to this list a specimen of the very 

 rare tamarin, Seniocebiis meticnlosus Elliot, of which I made a negative 

 and preserved the skin and skeleton. From all of the first-named three 

 I likewise obtained complete skeletons, ^ and from them all photogiaphs 

 of the various parts of the same, which photographs are herewith 

 reproduced. For comparision I have had the use of a complete 

 skeleton of a male Lasiopyga callitrichus from the U. S. National 

 Museum (No. 16365). 



Cranium and Mandible. 

 (Plates XII-XVII, figs. 1-19; Plate XX. fig. 24; Plate XXI, fig. 26.) 

 It has long been known that the skeleton in the Simiina is formed 

 upon the same general plan as Homo. Comparative osteology more- 



2 The author has generously donated the skeletons of L. griseoviridis, C. jacchus, 

 and S. meticulosiis to the Carnegie Museum. (Accession 5103). Editor. 



