58 



Length of medial line 



Width at top 



Width at bottom 



Inches. 



1| 



2 



If 



Very lately, however, by sifting the sand, another and 

 smaller bone has been detected, which appears to be one of 

 the component bones of the terminal or third piece of the 

 sternum. What is most worthy of notice in it is, that it 

 shows the sternum of 'Eupliysetes to have been terminated by 

 two distinct flat triangular bones, almost exactly as in the 

 Sydney Catodon. This terminating bone has the points of 

 the triangle blunt or rounded off; the base of it is rather 

 more than three-quarters of an inch long, and the sides are 

 each about one and a- fifth inches long. 



OF THE PECTORAL FINS. 



It will be seen from the following description of the hands, 

 fore extremities, or pectoral fins of the Euphysetes, that it 

 possesses in these organs no strength in proportion to that 

 which exists in the fins of the true sperm whale. Indeed in 

 all the Cetacea the pectoral fins can, from their feeble struc- 

 ture, be of little use as organs of locomotion, and probably are 

 principally of service in supporting their young. In 

 our animal the scapula is a remarkably thin, flat, smooth 

 bone, with scarcely any convexity. Indeed the little con- 

 vexity which exists in this broad subtriangular plate is 

 towards its fore edge, where this convexity is turned towards 

 the ribs. The upper edge of this scapula forms nearly the 

 quadrant of a circle. Its posterior edge is concave, and the 

 anterior edge sinuated somewhat in the shape of any. The 

 outer crest of the base of this scapula gives rise to the acro- 

 mion, which is also a thin subtriangular plate, and from the 



