FROM QUATERNARY DEPOSITS IN THE VALLEY OF MEXICO. 
69 
not subangular prominences as in Camelus, but are convex as in Auchenia, yet in a 
markedly minor degree ; and, concurrently, the worn edge of parietal enamel is more 
even, rises less angularly, than in existing Camelidoe. The small anterior lobule (“ filet 
verticale,” Cuvier) is present in the penultimate and last molars, as in Auchenia , but is 
relatively less, and is indicated only on the outer side of the tooth (ib. fig. 1, m2, x , and 
m 3, x). The third or posterior lobule of m 3 (ib. z) is relatively less developed than in 
either Auchenia or Camelus . 
The canine, 1 inch 1 line in length of crown, 6 lines in fore-and-aft breadth, is com- 
pressed, recurved, and retains more of the shape and proportions of that tooth in 
Auchenia than in Camelus. 
The following are dimensions of the series of grinders and of the individual teeth of 
Palauclienia magna : — 
Teeth, Lower jaw. 
Palauchenia. 
Camel. 
Lama. 
m. in. 
lines. 
in. 
lines. 
in. 
lines. 
Length of series of p 3 -m 3 
0-168=6 
7 
6 
9 
3 
0 
p 3. Antero-posterior breadth of base 
0-007=0 
3 
p 4. Antero-posterior breadth* 
0-029=1 
U 
1 
0 
0 
51 
Transverse breadth * 
0-023=0 
11 
0 
7 
0 
2 
Length of crown f 
0-034=1 
4 
1 
2 
0 
6 
m 1. Antero-posterior breadth £ 
0-039=1 
6 
1 
6 
0 
7 
Transverse breadth 
0-024=0 
Ui 
0 
9J 
0 
5t 
Length of crown } 
0-034 = 1 
4 
1 
3 
0 
5 
m 2. Antero-posterior breadth 
0-045=1 
9 
1 
11 
0 
9 
Transverse breadth 
0-024=0 
111 
0 
H 
0 
6 
Length of crown 
0-035=1 
4§ 
1 
4 
0 
6 
m 3. Antero-posterior breadth . 
0-048 = 1 
10| 
2 
4 
1 
0 i 
Transverse breadth 
0-024=0 
114 
0 
9 
0 
5 
Length of crown 
0-050=2 
0 
1 
5 
0 
7 
Cervical Vertebrae. Plates V., VI., VII., and Plate IV. figs. 5 & 6 (reduced view). 
With the decayed portions of mandible and the teeth above described were found 
parts of the skeleton, of which I have been favoured by Don Antonio with plaster-casts 
and photographs of six vertebrae. They are more or less mutilated, but sufficiently 
entire to show that they are the six consecutive vertebrae of the neck succeeding the 
atlas, and of one and the same quadruped (Plate IV. fig. 6, 2107). 
These cervical vertebrae present the character of the intraneural vertebrarterial canal 
characteristic of the Camelidce among existing Ungulates ; and, as this character is only 
known among extinct species in the perissodactyle genus Macrauchenia , the field of 
comparison is restricted, and the results confirm the inference, from juxtaposition of the 
fossils, that the vertebrae in question belong to the same animal as the teeth above 
described. 
* Across the middle of the grinding-aurface. 
f To the origin of the roots. 
t Across the middle of the anterior lobe. 
