282 LILLJEBORG ON THE 



base of the lower ramus tliere is a transverse low process or projecting edge, which is directed 

 backwards. Similar processes also exist in other BalænojAeræ, as B. rostrafa. 



This whale must have had at least 15 pairs of ribs, agreeing to the 14 pairs that were found 

 more or less complete, except the 1st, which was not found. As these 14 pairs seera to be suc- 

 cessive, and the appearance of the 14th pair shows it to be the last, it is probable that it has not 

 had more than 15 pairs, and consequently not more than 15 dorsal vertebræ. 



The 1st dorsal vertebra is, as usual, characterised by its smaller size, and by the lateral pro- 

 cesses being strongly bent forward, and compressed at the point. The bodies of the succeeding 

 dorsal vertebræ increase in length backwards, and the lateral processes are wide and concave on 

 the lower side of the point, where the ribs have their upper end fixed ; they are, on the supposed 

 3rd, directed forward, but are directed backwards on the supposed 5th and the succeeding dorsal 

 vertebræ.^ 



The 1st lumbosacral vertebra is singular for its lateral processes being more obtuse at the 

 point than those of the other lumbosacral vertebræ, and by being directed more backwards, 

 although not quite so much as the lateral processes of the posterior dorsal vertebræ. Its corpus, 

 at the fore end, has both the upper and the lower edges convex, and forming a gradual curve, and 

 is convex on the lower side, without any longitudinal ridge. The 2nd and 3rd lumbosacral 

 vertebræ are also without any ridge on the lower side of the corpus, although the latter has a con- 

 siderable convexity; the 5th and the succeeding ones are keeled. The lateral processes of these 

 vertebræ do not decrease suddenly in length backwards, which denotes a large number of similar 

 vertebræ, and that the estimated number of 14 is thus not too high, especially if the difference 

 of form between the supposed 11th lumbosacral vertebra and the supposed 1st caudal vertebra 

 is taken into consideration. There may possibly have been one or more lumbosacral vertebræ. 

 The lateral processes of the 9th — 11th of these vertebræ are directed almost straight out towards 

 the sides ; they are directed backwards in the preceding. 



Those caudal vertebræ that have lateral processes have them directed forward, and are 

 besides pecuhar for their smaller processes generally, smaller foramen spinale, and higher corpus, 

 with a different appearance of the lower side ; the lateral processes are farther from the arcus 

 vertebræ, and strongly directed downwards. The 1st caudal vertebra has an obtuse ridge on the 

 lower side of the corpus forwards, and is concave behind where this terminates, and has, at the 

 sides of this concave surface, hardly perceptible articulating surfaces for the 1st processus spinosus 

 inferior; the 2nd caudal vertebra resembles very nearly the 1st in form, but has, on its lower 

 side, before, a flattened ridge, which, further back, changes into a longer concave surface, that on 

 both sides is limited by a longitudinal process, one of which is remarkably high and thin.^ The 

 hinder caudal vertebræ decrease rapidly in size backwards ; the processus transversi are still 

 conspicuous on the supposed 11th caudal vertebra, but are very feebly indicated on the 12th and 

 18th, particularly on the latter; the processus spinosus is very low on all three of these, and is 

 rudimentary on the 13th, but still surrounding the foramen spinale above; these processes are 

 not found on the succeeding caudal vertebræ. The last signs of articular surfaces for processus 

 spinosi inferiores are visible on the 16th caudal vertebra. 



Three of these vertebræ were found close together, with the ends of their bodies in their 

 uatural position. 



This vertebra is described as the last lumbo-sacral vertebra in the report referred to. 



