the posterior wall of M1 does not extend down the crown
so far as the level of the alveolus, whereas the anterior plate of
enamel on M1, for example, extends well below the alveolus of the
tooth. Even though disappearance of the posterior enamel seems to be a
trend in both species, it has proceeded farther in _P. alcorni_ than in
_P. bulleri_. Examination of the posterior wall of M1 in _P. alcorni_
disclosed only the vestige of enamel on the inner side of the tooth,
and no enamel, not even a thin plate, was present on the remainder of
the posterior wall of the tooth.

The name _alcorni_ is proposed as a token of appreciation to Joseph
Raymond Alcorn, whose collecting has greatly enriched our knowledge of
the mammals of Mexico.

_Transmitted August 30, 1956._

26-5801

* * * * *

Transcriber's Notes:

Bold text is shown within =equal signs=.

Italic text is shown within _underscores_.

End of the Project Gutenberg EBook of A New Species of Pocket Gopher (Genus
Pappogeomys) From Jalisco, Mexico, by Robert J. Russell

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