Page 226. 
436 ON TOLYPEUTES TRICINCTUS. 
It should also be mentioned that in 7. tricinctus there is much 
more hair on the carapace at the posterior margins of the scutes than 
in the two other species, and that it has only eight teeth on each side 
of each jaw, whilst both in 7. conwrus and in J. muriei there are 
nine. : 
All the specimens of the genus Tolypeutes agree, as far as my ex- 
perience goes, in the manner in which their cervical vertebre anky- 
lose—the atlas, together with vertebre 5, 6, and 7 alone being free. 
Concerning the geographical distribution of the genus Tolypeutes, 
the localities whence both Dr. Murie’s and my specimen were ob- 
tained cannot be determined, they having been both purchased of 
dealers. 
The specimen 140 a in the British Museum, of 7. mwriei, was pre- 
sented by Burnett and Fitzroy, and therefore must have probably come 
from some part of the coast of La Plata or Patagonia. 
A national specimen of 7. conwrus is marked as having come from 
Bolivia. Another of the same species, in the museum of the Royal 
College of Surgeons, was presented by Mr. Darwin. 
The type specimen of 7’. conwrus was obtained in the province of 
Santa Cruz de la Sierra, Bolivia; and for a cast of its cephalic shield, 
from which I have been able to determine the correctness of the 
nomenclature above adopted, I have to express my very best thanks to 
Professor Alphonse Milne-Edwards. 
The species described by Burmeister* from Buenos Ayres is T. 
conurus. 
Azara found a four-toed species in Paraguay; it was therefore not 
T. tricinctus. 
The brain of no species of Tolypeutes has been described, Dr. Murie 
having met with an accident with his specimen. By Gervais a cast is 
figured of the interior of the skull, which demonstrates the large size 
of the olfactory lobes,t together with its general proportions, and but 
little more. 
Our knowledge of the brain of the Dasypodide has been much 
increased by a paper from the pen of Prof. Turner in the first volume 
of the “ Journal of Anatomy and Physiology ”’t on the brain of 
Dasypus sexcinctus, in which the bibliography of the subject is fully 
given. 
The general appearance of the brain of Tolypeutes tricinctus differs 
but little from that of Dasypus sexcinctus, whilst in surface-markings 
it much more closely resembles that of Tatusia peba, as figured by 
* “ Annales del Museo Publico de Buenos Ayres,’ 1871, tom. ii. p. 117. 
+ “Les formes cérébrales des Edentates,”’ Nouv. Archiv. du Muséum, 1869, 
tom. vy. pl. ii. fig. 8. ft 1867, p. 313. 
