————— 
1883, ] 321 [Cope. 
cusp has a V-shaped section, because its anterior border is continued as an 
oblique ridge to the base of the anterior internal cusp. Internal cingular 
none ; a slight one on the external base of the large anterior external 
cusp. The heel of the third true molar is well developed, and rises into 
an acute cusp. That of the fourth premolar is short and flat. The anterior 
cusp of the same is basal and rudimental. This tooth is not enlarged as is 
usually the case in the Periptychide, and it first here differs from these 
animals, and agrees with the unguiculate types in that its lateral faces are 
unequally convex, 
Measurements. M. 
Length of last four molarsron bases ys ecwe iil laid ewon ow OLE 
My He MOULOMVEHUOLAM ym sl dvd. g Mite ae aeliveetualy sine 0085 
Elevation of  « NN Vea vin wsiinibudeuwaviesi ds vise eve! 2008 
Length of second true molar. WY CPAP Vi 6G dh ys Govlnn Vila OA Ae « 008 
Width ‘i “ A CENGRUGR UT iiarsinis coreieihd evrvia vie .008 
Length of third « My “e Paneer nee . 004 
Width Wy & Ms eel ania Sine Aarne ORS 
Depth of ramus at second true molar. . 
ANISONOHUS COPHATER, sp. nov. 
A mandibular ramus supporting three molars 
that I have seen of this species, 
the A. agapetillus, that is, 
single premolar is muc 
EU wat edna . 007 
, two of them true, is all 
Its proportions are the same as those of 
much smaller than the A. gilianus, and the 
h more like that of other species of the genus. The 
true molars differ from those of the A. agapetillus in tw 
First, the internal posterior cusp is inside the 
that is, outside the bordering edge, 
posterior median cusp, 
o strong characters. 
rim of the heel of the crown, 
and is therefore very distinct from the 
It isa sharp cone 3 Secondly, there is a cingulum 
extending from this cusp round the internal base of the internal anterior 
cusp. There is also one at the base ofthe external anterior cusp, which con- 
tinues to the heel only on the last inferior molar, The posterior heel is rela- 
tively wider, and the anterior V relatively more contracted, than in the A. 
agaupetillus. The anterior tubercle ig moderately developed at the anterior 
base of the anterior V. The third or fourth premolar is equilateral, and 
larger than the true molars, Tt has ashort apiculate heel, and a rudimental 
anterior basal tubercle. 
Measurements. M. 
f anteroposterior. ..... .0082 
horizont: 
f orizontal transverse , «+ 0080 
Diameters of m. ii 
 vatiloal (MOT STION ee eee ec eae + 0025 
; POSTORIG I Rey, 0018 
| Anteroposterior........., 0048 
Diameters of P-m. iii or iv 2 vertical (restored apex)... .0040 
WANS VOTBOy siiis OM dive ilies .0023 
D. Baldwin, discoverer, 
JHIROX PLICATUS, gen. et sp. nov. 
Char. gen. These are known from three superior molars ; 
PROC, AMER. PHILOS. SOC. xxt, 114, 20. 
viz: the last 
PRINTED JANUARY 28, 1884, 
