434 ON TOLYPEUTES TRICINOTUS. 
Page 224. the name Tolypeutes muriet, after the author who has so well described 
its structure. Dr. Murie’s figure, being based upon a photograph of 
the specimen, is thoroughly reliable. 
a, T. tricinetus. 
Cephalic shields of Tolypeutes. 
M. Is. Geoffroy St.-Hilaire has so well differentiated 7. tricinctus 
and 7’. conurus that it will be necessary for me only to mention that in 
the former there are five toes on the fore feet (as in the Society’s 
specimen in my possession), whilst in 7’. conwrus, following the account 
of the discoverer of the species, there are “ trois doigts seulement, 
avec le rudiment d’un quatriéme, aux pattes antérieures (ce rudiment 
represente le doigt interne). Point de doigt externe.”’ The same re- 
‘marks apply to 7. muriei; for in the specimen in the British Museum 
there are four toes on each fore foot, whilst in Dr. Murie’s example 
the pollex was not present. 
The tail, with its infundibuliform armature, is distally covered 
with four pairs of small rows of plates, arranged in longitudinal lines, 
there being one superior and one inferior pair, one supero-lateral and 
one infero-lateral. In T. tricinctus the whole organ is flattened from 
above downwards; in 7’. conwrus and T’. muriei it is not so. Two and 
a quarter inches appear to be its extreme length along its dorsal curve 
in all but the largest individuals, where it may reach two and a half 
inches. I do not find that the different species differ in the length of 
this appendage, which is correlated, as far as its length goes, with the 
