1890.] The Cetacea. 613 
Species of Balzenoptera and Megaptera occur in the European 
and probably in the American Miocenes. Those of Belgium 
correspond in various respects with the existing species. Thus 
Balenoptera goropiü is compared by Van Beneden with the com- 
mon existing finner, B. musculus; the B. dorealina Van B. with 
the B. borealis of the Atlantic; and the JB. emarginata Owen 
with the small pike whale, B. rostrata. Three species of Belgium 
and England are referred to the hump-backs, or Megaptera. A 
remarkable genus is Herpetocetus Van B., of which a single 
species of rather small size has been found in Belgium. 
Fic. 7.—Cetotherium cephalus Cope, otic bulla. One-half natural size; original; 
mm Miocene of Maryland. 
Forms more or less nearly related to the right whales occur 
in Miocene beds on both sides of the Atlantic. Mesoteras Cope 
has the characters of the finner whales (Balenoptera) with the 
narrow maxillary bones of the true Balenz. A large species 
with a skull of about eighteen feet in length was found by Prof. | 
W. C. Kerr in Eastern North Carolina, and was named by the 
writer Mesoteras kerrianus. It is distinguished by an enormous 
thickening of the superciliary part of the frontal bone. The peri- 
otic bones are peculiar for their very short proportions, and 
balzni-form bulla. A small balanoid with only partly co- 
Ossified cervical vertebra has been found in the boulder clay 
of England and named Paleocetus sedgwickii by Prof. Seeley. 
The P. insignis Van Ben. from Belgium is also a small species. 
True Balenz have been found in various parts of Europe. 
