42 
APPENDIX, 
MAMMALIA. 
Cetacea. 
Eschkichtius mtsticetoides. Emmons. ( Balaena .) Emmons’ No. Ca. 
Geol. Surv. 1856, p. 204, fie;. 26. Leidy Mamm. Dak. Nebr. 1869. 
ESCIIR1CHTIUS POLYPORUS. Cope. 
Species Nova. 
Character. Ramus mandibuli with coronoid process but little elevated ; 
form compressed with narrow acute superior margin, which is not flattened 
posteriorly. On its inner face a wide shallow groove in which the inner 
series of foramina lie. Foramina of outer series large, numerous. Size 
large. 
Demotion. This whale, from the form of the ramus mandibulli, is a 
firmer, and from the slightly developed coronoid process, allied to the 
humpbacks. The coronoid, the anterior position of the dental foramen, 
and the angular process, confirm these relationships. Whether it be a 
Megaptera or an Eschrichtius I am not prepared to state. Ear bullae of the 
forms of both these genera occur in the strata in which the present species 
was found, and future investigation must determine which are referable to 
the latter. Such a bulla of the form of and probably belonging to, Megap- 
tera. has been named Balaena mysticetoicles by Emmons’, (North Carolina 
Geol. Survey Tab.) 
The fragment on which the present species is based, is the proximal two- 
fifths the left ramus mandibuli, with a considerable part of the condyle. 
The direction of the shaft from a -short distance anterior to the coronoid 
process, is decurved. The inferior margin is slightly contracted below the 
coronoid process, and is for a short distance convex and narrowed into 
a ridge ; anteriorly it is more obtuse or convex transversely. The inner 
face is plane at the coronoid process, the outer convex. Anterior to this 
point the convexity is strong ; at the distal end of the fragment, much 
marked. 
The angular process has extended beyond the line of the condyle ; its 
extremity is broken away. A wide groove separates it from the base of 
the ramus. The surface of the condyle is transverse to the plane of the 
ramus, and is strikingly elevated above the portion of the ramus anterior 
to it, being as high as the tip of the coronoid process. A low knob 
projects on the inner face of the ramus beneath its anterior part, and 
