298 



LILLJEBORG ON THE 



Length of processus spinosus of tlie 1st vertebra 

 „ „ „ 2ud „ 



» » i> 3rd „ 



„ processus transversi of the 1st „ 

 2nd 

 » „ 3rd „ 



Distance between the extreme edges of processus obliqui of the 1st vertebra 



2nd „ 

 » „ }> 3rd „ 



5th 



6th „ 



„ „ „ T'th „ 



„ „ 8th „ 



Length of sternum ... 



Breadth of „ ... 



Thickness of sternum at the middle . 



Length of one of the ribs fitted together (probably the 



on the outer side 



of the supposed 4th or 5 th . 



„ of the longest piece of a rib . 



Width of the first mentioned, at the lower end 



Length of scapula .... 



Width of „ 



„ „ above the base of acromion 



„ coUum of „ „ 



Length of acromion 

 Thickness of the upper edge of the scapula 



3rd or 4th) along the curve 



3' 

 4' 

 3' 



1' 

 1' 



3" 



3r' 



31" 

 3!" 

 31" 



31" 



4|" 

 51" 

 5" 



45" 



4r 



31" 

 6|" 



^t' 

 U" 



31" 

 2" 

 3f 



51" 

 4f 

 If 

 1" 



We find from these measurements that the vertebrae, even after increasing their length with 

 the thickness of their epiphyses, have a greater width than in the preceding genera. We also find 

 that the distance between the outer edges of the processus obliqui, or the width across them, 

 is likewise greater. In comparing these latter measurements with those of the skeleton of the 

 B. robusta in our museum, which, however, has this width greater than in the other Balænopteræ, 

 and was of more than double the size of the whale in question, we see that the width across 

 the processus obliqui of the caudal vertebrae in the former is in some cases absolutely smaller than iu 

 the latter. These proportions distinctly characterise these caudal vertebrae as belonging to a 

 Balæna. It cannot be determined which of the series of caudal vertebrae they are, without 

 comparison with a complete skeleton of the same species. There is certainly a great differ- 

 ence between the 2nd and 3rd in regard to the wid^h of the processus obliqui, but they corre- 

 spond so nearly in regard to the other processes and to the corpus that they seem to be next to 

 each other.^ The last two (10th and 11th) only are without processus sphiosi. Tliis is directed 

 backwards on all, and is on the anterior ones wide and rounded at the point. It is entirely rudi- 



^ The vertebra mentioned as being in the Zoological National Museum in Stockholm was probably 

 placed between this and other vertebræ. 



