Cope.] 440 [May 3. 



the lakes are complicated, and so is the posterior border of the posterior 

 lake ; the anterior border of the anterior lake is simple. There are two or 

 three loops on the posterior border of the anterior lake, the inner one of 

 which is deep, and nearly or quite reaches the ends of one or two deep 

 loops which enter from the inner border. These nearly or quite cut off a 

 large lobe into a small subround lakelet. This is present on all the teeth 

 and is seen in Dr. Leidy's figure of his typical specimen, though not 

 quite so strongly marked. It is also present but less marked in the New 

 Mexican specimen I have described.^ There are four or five inflections of 

 the anterior border of the second lake, and two or three of the inner bor- 

 der at its posterior part. The external ridges of the crowns are well de- 

 veloped, and the cement layer on the external and internal faces of the 

 crowns, as well as in the lakes, is uninterrupted. The crowns do not dis- 

 play any part of the roots, and their wear is in two shallow grooves, a 

 median and a posterior. 



Ifeasurements of Cranium. 



M. 



Length below (including condyles) .315 



" from edge of incisor i to extremity of maxillary 



bone 220 



Length from edge of incisor i to extremity of palate 170 



" " " " fourth premolar (axial) 078 



canine (axial) 044 



" of zygomatic fossa 055 



" from incisor i to edge of orbit 190 



" " nostril " " " 115 



" " anterior edge of orbit to top of inion 150 



Horizontal diameter of orbit 048 



Width between orbits above (direct) 087 



Greatest width of zygomata 130 



Width of muzzle above preorbital fossae 040 



" " " " nareal angle 032 



" between third incisors 037 



" " diastemata posteriorly 027 



" " third premolars 034 



" " last true molars 050 



" " pterygoid crests at postalisphenoid foramen. . .021 



" " apices of postglenoid processes 070 



" of occipital condyles 050 



" " foramen magnum 022 



" " occiput at summit 030 



" " " " mastoid foramina 062 



Length of molar series 125 



" " third premolar 025 



Widih " " " (greatest) 014 



* Report U. S. G. G. Survey W. 100th Mer., Vol. iv, p. 322, I'l. Ixxv, Fig. 3. 



I 



