1 90, 



Cope.] ■^^'^ [May 15. 



3Ieasin'emcnts. 



MM. 



Long diameter of head of do 17 



" " " distal end of do 13 



Lengtli across ends of six ribs 75 



' ' of part of carapace preserved 105 



Width of a posterior carapacial bar 10 



"an anterior " " 8 



T^. , n .1 ^anteroposterior 8 



Diameters of a vertebra < ' 



c transverse lb 



Diameters of iutercentrum 



anteroposterior 6 



transverse 13 



Otoccelus mimeticus, sp. nov. 



This species is represented by a sknll with hnver jaw in ph^ce, Avhicli 

 is connected by a band of matrix to a carapace, and some of the bones 

 of one of the limbs. Greater and smaller parts of thirteen bands of the 

 carapace are preserved. 



The sknll is short and wide. The superior surface is nearlj' flat from 

 the posterior border to between the nostrils. The muzzle does not pro- 

 ject beyond the mouth border. The orbits and nostrils are not superior 

 in direction, although the superior orbital border is excavated. The 

 nostrils are directed forwards and a little laterally ; thej' are separated ])y 

 a space equal to the transverse diameter of each. The auricular meatus is 

 large and is directed outwards and not upwards. The posterior hooks of 

 the quadrate project on each side beyond the slightly concave posterior 

 horder of the cranial table. Interorbital region flat, considerabl)^ 

 wider than the diameter of the orbit. 



The carapace commences at a point about as far posterior to the skull 

 as the posterior border of the latter is behind the orbits. The anterior 

 baud has an obtuse anterior border like that of the anterior border of the 

 carapace of an armadillo. The bands are gently convex from side to 

 side, and they become narrower anteroposteriorly as we pass backwards. 

 The state of the specimen is such that neither ribs nor vetebr* can be 

 discovered. 



As compared with the 0. testudineus the following differences appear. 

 The table of the skull projects beyond the posterior hook of the quadrate 

 in the former ; not so far in the latter. The auricular meatus and orbit 

 present more laterally in the 0. mimeticus, more vertically in the 0. tes- 

 tudineus. The size of the two species is not very dift'ercut. 



3Ie<(SHrernents. 



MM. 



Length of skull on middle line 120 



Width " " at posterior liorder of orbits 90 



" " between orbits 38 



nostrils 22 



