eo 
265 
Length from nose to eye...... pra Oy 
——w— from nose to ear................ yor 
——-—.of the forefoot’ £223 6550.08. 0 8 
of the hind foot ................ 1 33 
The conformation of the skull is in perfect accordance with the 
external characters, and resembles that of H. longicaudatus so 
exactly, excepting in size, that its dimensions are all that need here 
be given. 
Total length from the front of the nasal bones to 
the occipmt NP CI eee ‘] 3k 
Length from the front of the nasal bones to the 
anterior root of the zygoma........ ehaaere stl 0 54 
ofthe nasal bones 5524-22 0 54 
-—from the point of the upper incisor to 
anterior molar ............ bias Neve IARTR eatete 4 
4 
=> OME WOGIAE TANGE::. 2565 2s ees ee wo 0 3 
Breadth behind the posterior root of the zygoma 0 7 
Length of the lower jaw from point of incisor to 
condyle 0. 9 
Depth from the coronoid process, vertically .... 0 4 
Length from point of incisor to anterior molar .. 0 
33 
Mr. Fraser’s note of the adult specimen is, “Taken en camino on 
my return from Pallatanga.”” Of the young one, it is added that 
«many dead ones were lying about, but too much eaten by insects 
to be of service.” The date of both notes is Dec. 1858. 
15. Mus rattus, Linn. 
Several specimens of this widely distributed species are included in 
the present collection, and some of these have their extremities white, 
i. e. the tip of the tail, and part of the toes of all the feet. They do 
not differ essentially ‘from specimens collected by Mr. Bridges in 
Chili, and others collected in Mexico by M. Salle. 
16. Lrpus BRASILIENSIS, Linn. 
One specimen, which Mr. Fraser says is a female, and was with 
young when obtained, which was in March 1858. 
17. EcHIMYS SEMISPINOSUS, 0. Ss. 
In my first notes on Mammals, collected by Mr. Fraser, I included 
the Echimys cayennensis, from the examination of a specimen which 
had lost the tail, and was otherwise in an unsatisfactory condition. 
Other and better specimens of Echimys having been received, I have 
been able to make out clearly that they represent a new and well- 
marked species, and that the former specimen was similar to them. 
The general form of this species is robust, more so than either 
that of L. cayennensis or EL. hispidus. The head is larger in relation 
to the size of the animal, the ears are much smaller, and the tail not 
above half the length of the head and body. The head is rather 
