On two subfossil Whales discovered in Sweden. 



39 



the processus mammillares thicker, and the lateral processes much shorter 

 and less inclined downwards. The transversal channel or concavity bet- 

 ween the anterior and posterior insertions of the processus spinosi inferiores 

 is considerably narrower than in the last described bone, and the foramen 

 spinale is much less, and also transversally oval. Dimensions of this ver- 

 tebra: Breadth of corpus in front 7*-"; height of d:o 6y"; length of d:o, exclu- 

 sive of epiphyses, 3]"; height of processus spinosus ly"; length of processus 

 transversi 2f"; distance between external borders of processus mammil- 

 lares 5f". 



The next vertebra (PI. IX. %g. 88 — 89) has no doubt been imme- 

 diately contiguous to the preceeding, and differs but little from it, and is 

 accordingly the 9 th caudal vertebra. Its processes are however something 

 shorter and its foramen spinale something smaller. 



The next fallowing caudal vertebra 1 ), which we take to be 10 th (PI. 

 X. figg. 90 — 93) has lost its arcus. The backwards gradually diminishing 

 developement of the processes is visible on it as on the others. In this 

 vertebra the foramina for the branches of the aorta first appear, and are 

 carried through the base of the lateral processes 3 ). The transversal groove 

 on the under side and on the lower sides of the corpus is deep, and above 

 the lateral processes the latter is also much holloved out at the sides, but 

 the channel for the branch of the aorta is there but inconsiderable. Dimen- 

 sions of this vertebra: Breadth of corpus in front 7"; height of d:o 7"; 

 length of d:o, exclusive of epiphyses, 3"; length of lateral processes ly"; 

 distance between external borders of mammillary processes 5". 



The 1 1 th caudal vertebra (PI. X. figg. 94 —95) is very nearly similar 

 to the last, and only differs from it in having the foramen spinale conside- 

 rably smaller, and the distance between the outer borders of the processus 

 mammillares rather less. The foramina and canals for the branches of the 

 aorta are similar, with the exception of the former being a little less. 



The 12 th caudal vertebra (PI. X. figg. 9G — 97) presents on the con- 



') This is the bone that the late Major Gyllenhal presented to the Royal 

 Academy of Science. We have, through the kindness of Prof. Angelin, had the 

 opportunity of directly comparing it with those preserved here. 



-) In this respect a great difference prevails between this Whale and the Nor- 

 thern (Bal. Mysticetus) in wich, according to Eschricht and Reinhardt, these 

 foramina are found as soon as in the second (in our opinion 3 rd ) caudal vertebra; 

 and the lower channel for the side-branches of the aorta forms a closed canal in 

 the Northern Whale already in the 4' h (5 lh ) caudal vertebra, but in the present spe- 

 cimen not before the 15"'. 



