IliS 



ECHINOMYS SEMISriNOSUS IN. NICARAGUA. 

 Measurements of the skulls of the same specimens. 



Baaicranial length | Eensel) 



Greatest breadth across zygomatic arches 



Length of nasals 



Breadth of nasals at anterior end 



Breadth .if nasals at posterior end (opposite fronto-maxillary suture) 



Leasl breadth between orbits 



Diameter of orbit from frontal to malar 



Length of upper molar series (crowns) 



Anterior margin of tirst molar to posterior margin of incisor 



Posterior end of palate to posterior margin of incisor 



Length of lower molar series (crowns) 



Height of coronoid process 



Depth of jaw below condyle 



in in . 

 45 



29.5 

 23.5 



6.5 



4.0 

 14.0 

 12.0 



9.5 

 14.0 

 22. .T 

 10.0 



2.0 

 13.7 



23253 

 L6355 



27.0 

 6.5 

 5.0 



9.5 

 15. 2 



24.0 

 10.5 

 3.2 

 15.5 



33.2 

 24.0 

 17.0 



3.5 

 12.7 



10.0 

 *6. 9 

 10.5 

 17.1 

 *7.7 

 1.7 

 10.5 



Only three molars are in position. 



