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, Poebr other iurrif 
Anoplotherium. 
Measurements * of the head. 
Meatus auditorius externus to infra orbitar foramen 
From point of hook-like process of inferior maxilla to anterior 
mental foramen 
Greatest width of orbit 
Narrowest part of face, below ossa nasi 
Width at the corono-condyloid depressions of inferior maxilla 
Width at the coi-onoid processes 
Greatest width at the ossa tympani 
Distance between ossa tympani 
Width of os tympanum 
Length of row formed by the posterior six superior molars ... 
Notch between the first and second superior premolars 
Length of row formed by the posterior six inferior molars 
Notch between the first and second inferior premolars 
In. 
3-1 
4*35 
1*15 
•2 
1*6 
2 * 
2-1 
•375 
•85 
2-5 
•333 
2-7 
•45 
Measurements of superior molar teeth. 
Length. 
Breadth. 
Thickness. 
7th molar 
•6 
•2 
6th — 
•55 
•25 
5th — 
-333 
•45 
•275 
4th — 
•9 
•375 
•25 
3rd — 
-15 
•4 
•2 
2nd — 
-1 
•35 
•1 
1st — 
*15 
•3 
•075 
Measurements of inferior molar teeth. 
Length. 
Breadth. 
7th molar 
-3 
•35 
6th — 
•5 
5th — 
*25 
•4 
4 th — 
-15 
•45 
3rd — 
1 
•35 
2nd — 
1 
•35 
Measurements from hones of fore-leg. 
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 the 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 same. 
