206 CATODONTIDiB. 



Dr. Jackson gives a comparison of the measurements and teeth of 

 nine lower jaws of the Sperm Whale, taken on the coast of North 

 America, which he had examined. — Boston Journ. N.H. 1845, v. 152. 



1. Length 16^ feet. Teeth 25 . 24, moveable, rather irregular. 



2. Length 15^ feet. Teeth 25 . 27, opposite in front, behind 

 irregular, hinder smallest and worn. Width at condyles 5|. 



3. Length 8^ feet. Teeth 20 . 20, regularly opposite, and very 

 little worn, the front largest, middle most slender, hinder smallest. 

 Width at condyles 3|. 



4. Length 7f feet. Teeth 26 . 23. 



5. Length 5| feet. Teeth 23 . 22, but connected in animal 18 

 feet long. Width at condyles 2|. 



6. Length 5| feet. Teeth 25 . 24, all pointed, and some hardly 

 cut the jaw. Cranium 6J feet long ; the petrose portion instead of 

 being free, as usual in the Cetaceans, is as closely connected with the 

 base of the skull as any other bone. Width at condyles 5-Jj. 



7. Length 15^ feet. Teeth 26 . 25. Width at condyles 5Jj. 



8. Length 7^ feet. Teeth 24 . 24. Width at condyles 3|. 



9. Length ^ feet. Teeth 23 . 23. Width at condyles 4|. 



A very young Spermaceti Whale, taken near New Bedford, Massa- 

 chusetts, 29th March 1842, weighed 3053 lbs. Entire length 16 feet, 

 to rudimentary dorsal 9 feet, to anterior fin 4 feet, to vent 10-^ feet, 

 to eye 3-^ feet, to angle of mouth 2-J feet. Circumference 9 feet. 

 Teeth of lower jaw not yet cut. 



The young is quite black, remarkably smooth and elastic, like 

 India rubber ; from a line with the anterior extremity of the head 

 to the top of the tail 16 feet, to the rudimentary dorsal fin 9 feet, to 

 the anterior fin about 4 feet, to the vent 10 feet 2 inches, to the eyes 

 3 feet 2 inches, to the external orifice of ears (which was about the 

 size of a goose-quill) 3 feet 8 inches, to the angle of the mouth 2 feet 

 10 inches ; vertical diameter of the head, just in front of the opening 

 of the mouth, 2 feet 10 inches, of the largest part of the body 3 feet ; 

 anterior fin 18 inches long and 9 inches wide. The dorsal fin or 

 hump forms a very obtuse angle, and is ill- defined, being about 

 10 inches in length and 2 or 3 inches in height ; there heing also 

 between it and the caudal two or three quite small Jmlets. Span of 

 tail 1 foot 7 inches, and 4 inches wide midway. Lower jaw to 

 angle of mouth 1 foot 8 inches ; right eye 1^ inch long. Circum- 

 ference of the body 9 feet. — Jackson, Boston Journ. N. H. v. 139. 



2. Catodon australis. The Australian Sperm Whale. 



Vertebrae 49. Cervical atlas free, rest very thin and anchylosed 

 together. 



Gatodon australis, W. S. MacLeay, New Sperm Whale, set m by W. 8. 



TFba, 8vo, 1 1 (skeleton), 1851. 

 Sperm Whale, JBeale. 



Inhab. South Seas. 



" The head is very thick and blunt in front, and is about one-third 

 of the whole length of the animal ; at its junction with the body is 



