MUSEUM OF COMPARATIVE ZOOLOGY. 163 



Fig. 4. The encranial surface of the ethmoid bone of the horse. The dotted line, as 

 it extends across the surface, represents the lower limit of the plate of 

 bone described in the text as covering in the ectoturbinal subdivision of 

 the surface. Natural size. 



Fig. 5. Frontal section, ^grammatically treated, of the turbinals of the horse. 

 Natural size. 



PLATE III. 



Fig. 1. Encranial surface of the ethmoid bone of the peccary. Natural size. 



Fig. 2. The isolated ridge of the first endoturbinal plate. Natural size. 



Fig. 3. Frontal section of turbinals of same, made close to the encranial surface. 



Natural size. 

 Fig. 4. The encranial surface of the ethmoid bone of the hog. 

 Fig. 5. The under nasal surface of the ethmoid bone of the two-toed sloth (Cholx- 



pus didactylus). Natural size. 

 Fig. 6. The encranial surface of the same. Natural size. 



PLATE IV. 



Fig. 1. The anterior aspect of the ethmoturbinals of the ethmoid bone of the three- 

 toed sloth (Bradypus tridactylus). 

 Fig. 2. The encranial surface of the same. 

 Fig. 3. The ethmoid bone of the common seal (Phoca vitulina). 

 Fig. 4. The encranial surface of the same. 

 Fig. 5. The under surface of the same. 



The figures are all of natural size. 



PLATE V. 



Fig. 1. Median sagittal section of nasal chamber of Epomophorus gartibianus. Slight- 

 ly enlarged. 

 Fig. 2. The same of Phyllostoma hastatum. 

 Fig. 3. The same of Co roll ia brcvicauda. 

 Fig. 4. The same of Artibeus (slightly distorted). 

 Fig. 5. Dorsal aspect of the turbinals in Carollia brevicemda. 

 Pig. (5. The sagittal section of' nasal chamber of Ptcrodcnna (slightly distorted). 

 Fig. 7. The dorsal aspect of turbinals of Artibeus. 



Figs. 2-7 enlarged one half. 



PLATE VI. 



Pig. 1. A median sagittal section of the nasal chamber of MegoderBUM spasma. 



Fig. 2. The same of Megadermafnms. 



Pig. 8. The same of Nycteris Thebaica. 



Fig. ■!. The same of RhinolophtU /, rnnn-cquinum. 



Fig. 5. The same of Phyttorhina trid 



Figures enlarged one half. 



