No. 473] 



SOWERBY'S WHALE 



363 



sevenths of the jaw length from the tip, just back of the symphysis. 

 The teeth of the Annisquam specimen barely projected above the 

 alveoli of the jaws and are sharply mucronate. The basal por- 

 tion of each, however, is more like that of the male's tooth in the 

 slightly convex posterior outline and the forward extension of the 

 anterior angle. Fig. 3 represents a lateral view of the tooth from 

 the right mandible of the Annisquam whale; its extreme length 

 from the point to the anterior tip is 55 cm. 



The Annisquam skeleton has 45 vertebra^. Four of the seven 

 cervicals are fused. The atlas, axis, anr 

 third cervical are firmly ankylosed through- 

 out, sa\e for the lateral foramina for tlu 

 passage of the cervical nerves. Tin 

 fourth cervical is fusetl to the tliinl b\ 

 the dorsal spine on the left side and \n 

 the tip of the upper lateral process of tlu 

 same side. Its centrum, right lialf of tlu 

 dorsal spine (the spine is divided meiH- 

 ally), and the remaining lateral j)rocessei 

 are free. This is the onlv case tluis fai 



