214 0. C. Marsh—New Tertiary Mammals. 
Centetodon altidens, sp. nov. 
A fragment of a lower jaw in our collections contains a pen- 
ultimate molar, which agrees so nearly in its main features 
with the last lower molar of Centetodon pulcher, that the species 
it represents may provisionally be referred to that genus, 
although the species differ widely in size and other respects. 
The tooth preserved is remarkable for its great height above 
the jaw. e notch between the low posterior tubercle and 
the elevated anterior trifid portion of the crown is not so deep 
as in the small species, and more like that in the genus Cenie- 
tes. There is a faint basal ridge around the crown, except on 
the inner side. 
Measurements. 
Longitudinal extent of last two lower molars,...........- 5G. . 
Antero-posterior diameter of penultimate ower molar,....3° 
Transverse diameter, .......+.....seeeeeceeeseeeecees 2°3 
BRR ROTO TOW oe ei ie eae yh cas oo s es baw 371 
Depth of jaw below penultimate molar,............++0+: 6° 
This specimen was found by the writer, last autumn, near 
Henry’s Fork. 
Entomodon comptus, gen. et sp. nov. 
Another genus of insectivores is represented by several is0- 
lated teeth, one of the most characteristic of which is a last 
ae! molar, in excellent preservation. This tooth is ve 
rrow, and its crown is composed of a low posterior tubercle 
slightly bifid; a pair of elevated central cones, the outer r bein 
the highest, and slightly in advance of the other; and a sma 
compressed anterior tubercle. Behind the inner central cone is 
a deep —— There is no basal eS The tooth indi- 
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Measurements. 
1g mms 
Antero-posterior saat of last lower molar,......--+-- 53 ™ 
Transverse diameter through central cones,.....+-++++++ 2°5 
Height of outer central cone above FAW ce i ccce canes et 4°4 
Height of anterior tubercle above jaw,......--+++++++++° 3°4 
The type specimen of this species was found near Henry 8 
Fork, last September, by Mr. G. M. Keasbey. 
Entomacodon minutus, gen. et sp. nov. 
A small insectivorous mammal, about as large as a mouse, is 
indicated by a fragment of a lower jaw with the last molar pe™ 
