53 



Length of medial line 



Width at top 



Width at bottom 



inches. 



Very lately, however, by sifting the saud, another and smaller 

 bone has been detected, which appears to be one of the com- 

 ponent 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 EupJiysetes to have been terminated by two distinct flat 

 triangular bones, almost exactly as in the Sydney Gafodon. 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 of an 

 inch long. 



or THE PECTOEAL FINS. 



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

 fore extremities, or pectoral fins of the EujyJiysetes, 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 

 Getacea the pectoral fins can, from their feeble structure 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 con- 

 vexity. Indeed the little convexity which exists in this broad 

 subtriangular plate is towards its fore edge, where this convexity 

 is turned towards the rib.s. 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 an/! 

 The outer crest of the base of this scapula gives rise to the 

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

 inner ridge a thicker and more solid coracoid apophyse projects 

 in the shape of a parallelogram. 



