APPENDIX. 
45 
sequence of pressure when lying in an oblique position. The whole cra- 
nium has been injured from the same cause, and the matrix usually soft, 
formed a solid investment of carbonate of lime from the carbonic acid lib- 
erated during decomposition, which required several days labor to remove. 
The parietal, occipital, and other bones of the brain-case proper, were not 
recovered. 
Description. The upper surface of the muzzle is but little decurved 
anteriorly. A portion of its outer margin, at the posterior part, is pre- 
served, so that its width is known. The maxillary forms a rather thin 
lamina, and does not present any great median decurvature, as though 
the vomer was not prominent below. Perhaps this peculiar flatness is 
partly due to pressure, but the premaxillary presents a similar character, 
which is evidently normal. This element forms one margin of the mass, 
and the question as to whether the exposed face were the outer of the 
right, or the inner of the left bone, required some care for its solution. Ante- 
riorly it is three inches in depth, near the posterior extremity, two inches. 
The greatest width near the middle, six inches. The margin next the 
remainder of the mass, is rather the more elevated ; the external some- 
what prominent and rounded. Beneath it a deep groove marks appa- 
rently the exit of a foramen. A groove in the same line is seen at va- 
rious points throughout its length where exposed. This bone is thus much 
flatter than in any of the Firmer whales, and resembles more that of the 
right whales. The outer face being nearly plane, it can scarcely be the 
vomerine face, which is concave, especially so in Balaena, for the accom- 
modation of the cartilaginous axis. The foramina and grooves equally 
present in boththese genera, are on the external side ; I therefore conclude 
that the external side ot the right premaxillary is the one exposed, and that 
the width of the muzzle includes the left premaxillary and maxillary. 
The suture between the latter is not distinct, owing to the presence ot 
longitudinal fractures. The width of the maxillary after the premaxillary 
is deducted, is not great, and is intermediate between that seen in Balaena 
and Megaptera. The right premaxillary may be traced for six feet two 
inches. Behind it a portion of the superficies ot the cranium slopes 
towards the position formerly occupied as a blowhole. 
The margin of the maxillary is horizontal, and rather thin. It 
becomes thicker posteriorly where it has been crushed back on the lateral 
orbital process of the frontal. Its accumulated extremity is seen lying on 
the latter. 
The orbital process of the frontal is remarkably massive, and might at 
first be taken for the squamosal. Its posterior margin is free to within a 
foot of the probable position of the blowholes. This fact, in connection 
