200L0GY. — 'NARWAI,. 493 



angle, is in some narwals less than 60 degrees, in 

 others upwards of 90. 



The hlowhole communicates with a large douhle 

 cavity or air-vessel immediately under the skin ; 

 and this is connected with the nares of the skull, 

 where the opening is divided by a bony septum. 



In a fine fatty substance about the internal ears 

 of the narwal, are found multitudes of worms. They 

 are about an inch in length, some shorter, very slen- 

 der, and taper both ways, but are sharper at one 

 end than at the other. They are transparent. With- 

 in, is the appearanceof a canal ; without, is a brown- 

 ish ridge, running longitudinally along the body. 



The vertebral column of the narwal is about 12 

 feet in length. The cervical vertebrae are seven in 

 number ; the dorsal twelve ; the lumbar and caudal 

 thirty-five. The whole are fifty-four, of which 

 twelve enter the tail, and extend to within an inch 

 of its extremity. The spinal marrow appears to 

 run through the processes of all the vertebrae, from 

 the head to the 40th, but does not penetrate the 

 41st. The spinous process diminishes in length af- 

 ter the 15th lumbar vertebra, until it is scarcely 

 perceptible at the 19th. Large anterior or belly 

 processes, on the opposite side of the column to the 

 spinous processes, attached to two adjoining verte- 

 brae, commence between the 30th and 31st, and ter- 

 minate between the 42d and 43d vertebrae. The 

 ribs, which are twelve on each side, six true and six 



