On two subfossil Whales discovered in Sweden. 



17 



guishes them is, that the processus coronoideus is rudimentary, in the form 

 of a tubercle, widening a little at the outer side; that they are very little 

 bent, and that they have the back end very high, higher than the rest of 

 the bone, with a remarkably large condylus. As well in this last circum- 

 stance as with respect to the coronoi'de process, they present an approx- 

 ximation to the genus Balaena. The large condylus indicates that the cra- 

 nium had large articular processes on the temporal-bones. Even their an- 

 terior termination is different from that of the other Balaenopteridae in as 

 much as that it is nearly as much twisted as in the Balaena, so that the 

 outer side almost is subjacent and horisontal, and the inner is for the most 

 part directed upward. They are in proportion to their length higher than 

 in any other Whalebone-Whale. Their upper part is, in front of the coro- 

 noide process, compressed and thin, and stands about as high up as that 

 process. On their outer side they present a slight uniform curvature, and 

 there one remarks 7 oblong holes for vessels &c. The distance between 

 the condylus and the great opening for the alveolar vessels and nerves is 

 less, and thus the collum shorter than in the other Balaenopteridae, but not 

 so short as in the Balaena. The back part of these bones is moreover di- 

 stinguished by their lower or angular portion being as large as the condylar 

 portion, and these are but little separated, and display on the back part a 

 single continuous articular surface. The height or longitudinal dimension 

 of the condylus is considerably greater than the transversal. The dimen- 

 sions of the lower jaw-bones are 1 ): Length 8 y . 2"; height over condylus 

 l', 5"; height over coronoi'de process ll"; heigth in the middle 10I". From 

 the length of the lower jaw-bones we may infer that this Whale's head was 

 about 8' long. The left lower jaw-bone is on the outer side much injured 

 by caries. Though these bones differ greatly in form from those of the 

 Balaena, being much shorter and higher, yet they exhibit in the character 

 of the coronoi'de process, as also in their hinder extremity and the strongly 

 twisted forepart a stronger affinity to that genus than to any of the Balae- 

 nopteroides; and more especially these bones prove that this Whale may 

 with reason be looked upon as the type of a separate genus. 



The found cornu anterins (PI. I. fig. 5) which is about 17" long 

 in a straight line, agrees with the ordinary form of that of the Balaenop- 

 teridae. It is slender and slightly curved, with the front side (r) concave 

 and the back (</) convex, and the interior end (a), which is slightly turned 



') All measures are expressed in Sweedish "verkmatt" which is nearly the same 

 as English. 1 Sweedish Inch = 0"\9742 English. 



Nova Acta Reg. Soc. Sc. Ups., Ser. III. Vol. VI. 3 



