207 
APPENDIX. 
Description of the Bones found in a " Pict^s iTouse^^ in the 
Island of Harris. Being Notes to Communication read 
22d February i860. Bj James M'Bain, M.D., E.N. 
The first fragment is a portion of the right side of the upper 
jaw of a dog of tolerably large size, with a part of the molar 
bone attached ; the sectorial tooth and first tuberculated per- 
manent molar remain in situ ; and there are sockets for the 
second and third premolars in front, with a socket for the last 
true molar behind. The sectorial tooth in the upper jaw of 
the Canidce is preceded by a deciduous toothy and is therefore 
a premolar. The foramena present in this fragment are the 
inferior orbital foramen^ the lachrymal canal, the spheno- 
palatine foramen for transmitting nerves and vessels to the 
nasal fossae, and a slightly developed palato-maxillary canaL 
The next specimen also belongs to the dog, and is a part of 
the left lower jaw; it corresponds in size with the portion of 
the upper javf just described, and probably belonged to the 
same individual — it contains the last premolar, the sectorial 
tooth, the second true molar, and a socket for the third and last 
permanent molar. The sectorial tooth in the lower jaw is not 
preceded by a milk tooth as in the upper jaw^ and is in fact 
the first true molar. The dental formula of the Canidce 
is ^ n — ?; c = — =- pm r m — ?^ = 4 J. 1 he depression termed 
3 — 3 1 — 1"^ 4 — 4 3 — 3 ^ 
by the Masseter muscle in the lower jaw of the dog does not 
extend to the under edge of the bone as it does in the fox, 
and would enable the comparative anatomist to distinguish 
to which of the species this fragment of the lower jaw belonged. 
The third specimen is the left tympanic bulla of the common 
seal {Calocephalus vitulinus)^ broken off at the fissure that 
divides the bulla from the mastoid process. The mastoid pro- 
cess is very slightly developed in the section of the Plwcidm 
