392 Miscellaneous. 



premolars, it is closely allied to the Xiphodont Anoplotherium, while 

 in the true molars it is characteristically ruminant, and its position 

 would therefore probably stand thus : Dorcatherium, Poebrotherium, 

 Anoplotherium. 



Measurements * of the head. 



In. 



Meatus auditorius externus to infra orbitar foramen 3'1 



From point of hook-like process of inferior maxilla to anterior 



mental foramen 4^35 



Greatest width of orbit 1*15 



Narrowest part of face, below ossa nasi '2 



Width at the corono-condyloid depressions of inferior maxilla I'G 



Width at the coronoid processes 2* 



Greatest width at the ossa tympani 2*1 



Distance between ossa tympani ^375 



Width of OS tympanum '85 



Length of row formed by the posterior six superior molars ... 2^5 



Notch between the first and second superior premolars '333 



Length of row formed by the posterior six inferior molars 2*7 



Notch between the first and second inferior premolars ^45 



Measurements of superior molar teeth. 



Measurements from hones of fore-let/. 



Transverse diameter of lower articular surface of os humeri '75 



Antero-posterior diameter in depressed portion of same ^45 



Length of olecranon above the lowest part of the articular surface 



of the elbow '95 



From Sillimans Journal for March 1848. 



On two new genera of Siliceous -shelled Polygastrica from Patagonian 

 Guano. By Prof. Ehrenberg. 



From the very large number of tKe typical generic forms of Poly- 

 gastrica already described and arranged, new genera no longer occur 

 so frequently ; but when they do, the new forms have a greater sci- 

 entific value. During his stay in England last summer Prof. Ehren- 



* The measurements are taken in English inches and parts of the sanie. 



