48 Dr. Wyman on the Cranium and 
We might pursue farther the list of delinquencies and extend 
it also to foreign species. As to the latter, there is less reason for 
complaint, although the work contains very little of what ap- 
peared in Europe in 1851. With regard to the former we think 
that American mineralogists have already been sufficiently amused 
and will appreciate their obligations to the authors, without more 
details. The book was probably intended for a certain class of 
English readers that do not consider American rocks or science 
within the range of British interests, and viewed in this light, its 
errors or deficiencies, are not more perhaps than were to be ex- 
Art. VI.—Description of the interior of the Cranium and of 
the form of the Brain of Mastodon giganteus ; by JerrRrizs 
Wrman, M.D. 
Tue external configuration of the cranium of the Mastodon has 
been described by so many naturalists, especially by Cuvier, 
De Blainville, Godman, Hayes, Owen, and more recently by 
Warren, that little remains to be added to its descriptive anatomy. 
Its internal structure has however attracted but little notice com- 
paratively, and in all probability but few instances, favorable for 
observation have occurred, the crania of Mastodons having been 
generally looked upon as too rare and valuable to warrant the risk 
of making sections or the necessary dismemberment of parts. In 
the collection of Mastodon bones discovered in Warren Co., New. 
Jersey, in 1845, and now belonging to Harvard College, is the 
section of a cranium made under the direction of Dr. Warren and 
noticed in his recent memoir* on this extinct animal. From the 
perfect preservation of the bones and the care with which the 
section has béen accomplished, an unusually good opportunity is 
afforded for studying its internal structure. In the memoir j 
referred to, Dr. Warren has for the first time given the diameters 
of the cranial cavity and described the fossee in the base of the 
skull; the vast development of the diploic cells, and some of the 
foramina for the transmission of nerves, especially the foramen 
ovale, and Vidian canal, are also noticed. In plate 17 of his 
memoir is an excellent representation of the section of the cra~ 
nium and face. The individual to which the skull above referred 
to belonged was obviously immature, as the ossification of some 
of the bones is not yet quite complete. The molar teeth are tw 
in number on each side in each jaw and have each three ridges, 
ae Giganteus of North America; by John C. Warren, MD. byeot 
