PREFACE. ix 



ORDER IX. INSECTIVORA INSECTIVORES. 

 Fam. i. Soricida; Shrews. 

 Fam. 2. Talpidae Moles. 

 Fam. 3. Solenodontidce Solenodonts. 



ORDER X. CHIROPTERA BATS. 



Fam. i. Vespertilionidae Common Bats. 

 Fam. 2. Noctilionidse Large-eared Bats. 

 Fam. 3. Molossidae Free- tailed Bats. 

 Fam. 4. Natalidae Funnel-eared Bats. 

 Fam. 5. Phyllostomatidae Vampire Bats. 



ORDER XI. PRIMATES PRIMATES. 



Fam. i. Callitrichida? Marmosets. 



Fam. 2. Cebidae Prehensile-tailed Monkeys. 



The measurements of the species and races, unless otherwise 

 stated, are given in millimeters, and usually from some selected 

 specimen, although occasionally an average of several examples is 

 recorded. But it must always be remembered that the dimensions 

 of animals, even of adults belonging to the same species, vary 

 greatly, and there is no hard and fast rule by which the exact size of 

 any species or race of Mammals can be fixed, and allowance must be 

 made for this variability when a comparison is instituted between the 

 measurements given and some specimen in hand. It is really not 

 easy to find two mammals exactly alike in all their dimensions. This 

 fact was emphasized in the Preface of the "Synopsis," but it seems 

 necessary to repeat it here. 



The illustrations of the Crania exhibit the characteristics of 

 every genus and subgenus contained in the work, with but few excep- 

 tions, and the Institution to which each specimen belongs and the 

 catalogue number is given in every instance. The reason for an 

 exception in the list is that it was not possible to obtain the cranium 

 when desired, as no example was procurable from any collection in 

 this country. These illustrations in half-tone of crania, with the 

 exception of a few kindly furnished by the Director of the National 

 Museum, were made from photographs taken by Mr. C. H. Carpenter, 

 the Head of the Photographic Department of this Institution, and as 

 faithful representations of the subjects exhibited with often minute 

 and intricate details they will, it is believed, compare favorably with 

 any heretofore published. The tooth-rows were photographed by 

 means of an especial photomicrographic lens which causes the most 

 minute enamel folds to be clearly visible. 



The geographical distribution of many of the species and races 

 included in this work is very imperfectly known, as a considerable 

 number have been described only within a comparatively short time, 

 and consequently but little information has been received regarding 



