1902.] OF THE SHORT-NOSED SPERM-WHALE. 59 



In the present specimen (see PI. III. fig. 5) the bones and 

 cartilage were uninjured. 



The basihyal is a flat, irregularly circular bone, notched in the 

 middle line posteriorly, and with a pair of slight prominences at 

 the anterior end, separated only by a shallow furrow ; each of 

 these prominences bears a small tetrahedral cartilage, which 

 evidently correspond to the bony projections seen in Physeter, but 

 which in Gogia do not appear to ossify, for they are unrepresented 

 in Y. Beneden's figure. 



The anterior cornu consists of two segments, viz. : a short 

 proximal, cvirved cartilage, circular in section, representing the 

 ceratohyal ; and a much longer distal region, the middle of which 

 ossifies to form the cylindrical stylohyal bone. The postei-ioi' 

 cornu, as in Physeter, is a broad plate of cartilage, in the midst 

 of which is a more or less circular flat bone — the thyrohyal bone. 

 This posterior cornu is not segmented from the basihyal, the 

 cartilage being perfectly continuous. 



Measurements. 



Basihyal bone : millim. 



Greatest breadth 84 



„ length 66 



Thickness 5 



Length of cartilaginous process 18 



Total length of each half of the basihyal + thyro- 

 hyal, from the anterior end of the cartilaginous 



process to tip of cornu , 156 



Greatest breadth, across the two posterior cornua, 



measured from the outer margins 188 



Length of thyrohyal bone 55 



Breadth of „ „ 46 



Anterior cornu : total length 220 



Length of ceratohyal cartilage (in middle line) 37 



„ stylohyal segment 175 



„ „ bone (along its middle) 65 



„ „ hinder margin 75 



Thickness 15 



The Scapula. 



This bone has been figured more or less accurately by all the 

 authors who have dealt with this whale, but without the cartilages. 

 The scapula has the usual cetacean form (see PI. lY. fig. 6) ; its 

 external surface is feebly concave, owing to the reversion of the 

 anterior margin and of the superior border. The spine is but 

 feebly developed, but the acromion is a large subquadrangular 

 process. The coracoid process is large and well marked, not quite 

 so long as the acromion. The glenoid cup is oval. 



The following measurements of the bone, without its cartilage, 

 were made : — 



