APPENDIX. 
47 
maxillary bone, possibly a maxillary, but it is scarcely appropriate to the’ 
premaxillary already described. 
The periotic hones of the left side were preserved almost entire. The 1 
bulla has the flat inferior face of the genus Balaena, and the periotic 
processes are exceedingly short, shorter even than those of the spe- 
cies of Balaena (B. mystictus and B. ciearctica.) The external process 
is not longer than the posterior, and is compressed and deeply grooved 
longitudinally below. The posterior process is at right angles to the 
exterior, and as broad as long. It bears a sublongitudinal ridge near 
the middle of its inferior face; anterior to it, separated by an inter- 
val, a transverse ridge occurs to which the edge of the thin lip of 
the bulla is attached. The anterior process contains the usual fora- 
mina, and is broader than long. The superior face of these bones is 
quite rugose. The bulla is more flattened, i. e. has a shorter vertical 
diameter, than either that of Balaena mysticetus or B. cisarctica. The 
circumference is not a sharp edge as in B. cisarctica, but is truncate and 
rugose, at the inner extremity most so. At the external extremity the 
face gives way to a rounded edge. The inferior face is coarsely impressed 
punctate, and has a curved depression inside the anterior margin. The 
posterior margin is marked by the usual three grooves with intervening 
inflations. The general outline, viewed from below is hexagonal, with the 
length of the sides as follows, beginning with the longest ; posterior, ante- 
rior, interior, postero and antero-exterior equal, antero-interior very short. 
The bulla of B. cisarctica exhibits a long posterior and long interior side, 
connected by an arched outline. 
The vertebra} are those ot the genus Balaena. The general form of 
the centra of anterior lurabars and caudals, is abbreviated, especially the 
latter. The diapophyses of the former are thick at the base; one of those 
preserved may be a posterior dorsal, but the ends of the diapophyses are 
not preserved. In a caudal with very short diapophyses, which are a 
little nearer the bases of the chevrons than that of the neural arch, a 
small foramen penetrates the centrum from a point three inches above the 
base of the diapophyses, and issues at a point 2.5 inches below it. The 
articular faces are convex ; there is a small rugose central area, and an 
external annular space with coarse, concentric ridges. 
Measurements. 
Ft. In. Lin. 
Length of fragment of o. maxillare to extremity which 
reposes on frontal. 
9. 8 
