ART. 13 



ANATOMY OF CHINESE FINLESS PORPOISE HOWELL 



9 



Mandible. — There is noteworthy variation of the mandible only in 

 the height and shape of the coronoid processes. The two sides of 

 the lower jaw of 240002 exhibit asymmetry rostrad. Between the 

 twelfth and thirteenth teeth the height of the left side is 20, but 

 of the right only 16.6 mm. Accompanying this state of affairs, and 

 very likely having caused it, is a perforation of the lateral aspect of 

 this portion of the jaw, now continuous with the dental canal, and 

 probably indicating a former abscess at this point. It should also 

 be noted that in this specimen the superior portion of the symphysis 

 menti is indented or partially cleft, and within the angle so formed 

 there are two small teeth upon the right side and one on the left. 



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BWE.NT. CtW.- 



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ocap. Y^tu\Tx 



BORDtn Exocaip. 



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Fig. 3. — PosTEBioR aspect of the skull, showing position op muscle 



ATTACHMENTS 



This condition may very likely prove of significance in a study of the 

 dentition of the toothed whales. 



Teeth. — The number of the teeth in Neomeris is unstable and too 

 variable to be of much diagnostic value. Either tooth row of the 

 maxillary series may vary from 16 to 21 in number, and of the 

 mandibular from 15 to 20. My figures are essentially in accord with 

 those of Allen, save that in two of my skulls the right mandibular 

 series numbers 20 teeth in one and 21 in the other, while in the 

 individuals examined by him the greatest number in either side of the 

 lower jaw was 19. The youngest skull of the present series has the 

 largest number of teeth, and because of the crowded condition 

 they overlap shingle-wise. 



The hyoid complex exhibits the form shown in figure 4 and con- 

 sists of five bones. As herein termed, these comprise the body or 

 basihyal; the two ceratohyals attached upon the anterior portion of 

 the body ; and in further sequence the two stylohyals. There is con- 



20442—27- 



