ON A NEW SPECIES OF CEPHALUS. 
383 
the caudal are stated to have been placed on whitish carti- 
laginous substances, as there expressed, which were move- 
able by appropriate muscles. The upper part of the cau- 
dal fin projects beyond the lower ; and its general form ap- 
proaches to the small segment of a circle, 4 or 5 inches in 
radius. 
