A NEW GENUS OF INSECTIVOROUS MAMMALIA. 253 
the last of these by a small space, succeed four true molars on each side, vertical and 
smaller than those above, with two tubercles internally and one externally, so that the 
worn surface is triangular, with the apex outwards ; the last is the smallest : the sur- 
faces of all are apart, but their bases are in contact. 
In all respects, however, the agreement between Echinops and Ericulus, Isid. Geoff., 
is more intimate than between Echinops and either the genus Centetes or Erinaceus. 
Here, however, we still trace important modifications, both in the form of the skull and 
in the dental system. In Ericulus the skull is very elongate, and especially the muzzle, 
which bears a close resemblance to that of Centetes ; while in Echinops the muzzle is 
even proportionately shorter than in the Hedgehog. 
Moreover, in Ericulus not only do the teeth exceed in number by two in each jaw 
those in Echinops, but they also differ somewhat in arrangement. In the upper jaw of 
Ericulus the incisors are four, followed on each side by two spurious teeth, the first of 
which M. Isidore Geoffroy regards as a canine 3; to these succeed five true molars. 
Now in Echinops there are four incisors, and on each side a large canine tooth, a false 
molar, and four true molars. 
The lower jaw in Ericulus has four incisors, disposed laterally in pairs, followed on 
each side by two spurious teeth, the first of which, as on the upper jaw, M. Isidore con- 
siders to be a canine. To these succeed Jive true molars. 
In Echinops there are also four incisor teeth below, succeeded without interval on each 
side by a tooth corresponding in situation to a canine, which is followed by one false 
and four true molars, as above. 
Of the habits and manners of Echinops Telfairi I have no information : it cannot, 
however, be doubted that they resemble those of the Hedgehog ; and the arrangement of 
the spines, and the strong muscular panniculus beneath the skin sufficiently attest the 
power of rolling up itself into the form of a ball, after the manner of that animal ; a 
power with which the species of the genus Centetes are endowed in a far less degree. 
With respect to the internal anatomy of this animal, its decomposed condition prevented 
me from doing more than ascertaining the character of the alimentary canal. The in- 
dividual proved to be a female. The liver consisted of two right lobes, the innermost 
of which had a furrow on its surface, near the edge, approximating to the first left lobe ; 
and from this furrow arose the ligamentum latum. The left lobes were two in number, 
but smaller than those on the right. The gall-bladder large, oval and empty, occupied 
a situation on the under surface of the innermost of the right lobes ; and its duct, after 
a course of 3ths of an inch, received a large hepatic duct : the common duct thus formed 
was accompanied by a distinct hepatic tube, and both entered the duodenum together, a 
little distance below the pylorus. A large epiploon spread from the stomach, over the 
intestines ; and beneath the stomach, and attached to it, was the spleen, a long, slender, 
flattened mass, measuring one inch sths, and about 4ths in breadth. The decomposed 
state of the pancreas rendered this gland indefinite. The stomach was large, and almost 
