18/8.] MR. A. H. GARROD ON TOLYPEUTES TRICINCTUS. 



225 



It should also be mentioned that in T. 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 T. conurus and in T. muriei there are 

 nine. 



AH the specimens of the genus Tohjpeutes agree, as far as my ex- 

 perience goes, in the manner in which their cervical vertebrae aiiky- 

 lose — the atlas, together with vertebrae 5, 6, and 7 aloue being 

 free. 



Concerning the geographical distribution of the genus Tolypeutes, 

 the localities whence both Dr. Marie'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 T. muriei, was 

 presented by Burnett and Fitzroy, and therefore must have pro- 

 bably come from some part of the coast of La Plata or Patagonia. 



A national specimen of T. conurus 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 T. conurus 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 1 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 



1 Anales del Museo Publico de Buenos Ayrcs 1871 torn. ii. p. 117. 

 Proc. Zool. Soc— 1878, No. XV. 15 



