On two subfossil Whales discovered in Sweden. 



33 



The breast-bone (sternum) (PL VII. fig. 60) is much decayed, but 

 seems to have preserved its characteristic form, which also furnishes a di- 

 stinguishing mark of this Whale. It is concave at the anterior edge, with 

 a broad obliquely cut winglike projection on both sides of the front, and 

 running out behind into a long round pin or process - At the base of this 

 projection on either side, obliquely opposite to eachother, is an rough pro- 

 cess, which in all probability served to fasten the cartilage, wich united 

 the 1 st rib to the breast-bone. The upper side is concave and the lower 

 somewhat convex. Its length is II }", the breadth between the ends of the 

 winglike projections 1' \". 



The bladebone (scapula) (PI. VIII. fig. 61, 62) is also characteristic 

 of this Whale. It is not so broad as in other Balaenoptcridae, though not 

 much less than that of the Megaptera , but broader than that of the Balae- 

 niclae, and seems in that respect to stand between the two forms. Its breadth 

 at the upper part is greater than the length from the cavitas glenoidalis to 

 to the upper edge by nearly \ of the former. It is hollowed out in the 

 middle of the outer side. The acromion is broad and large, and the 

 processus coracoideus, though much shorter than the acromion, is yet tole- 

 rably long and thick, with the point rounded off. The cavitas glenoidalis, 

 viewed en face, is almost rhombo'idal. The spina scapulae extends upward 

 against to the upper edge, and nearer the acromion! its border is far in 

 front of the other edge of the bladebone. The bones length is 2' its 

 breadth 3' 6-p. Breadth of collum 1'. Acromion 9" long, and processus 

 coracoideus 



The os humeri (PL VIII. fig. 63, the left, seen from the outside) is 

 like that of the Balaenoptcridae in general, and somewhat more elongated 

 than that of the Balaenidae, and has a caput subterminale and not so obli- 

 quely directed as in these last. A part of the tuberculum majus is lost, 

 and that protuberance seems not to have been particularly large. The an- 

 terior edge, (spina tuberculi majoris), which goes directly down from the 

 tuberculum majus to the lower end, is tolerably sharp, and the corpus of 

 the bone has a rather compressed form. Lower down and on the outer side 

 of the anterior border is a tolerably deep hollow, and on the outer side 

 nearer the upper end there is a low crista passing obliquely over the middle 

 of the bone. On each side of the articular surface for the upper end of 

 the ulna is a ridge or crista and the inner of these is at its back part 

 divided into two by a sulcus. The two articular surfaces for the radius 

 and ulna form a very obtuse angle with eachother. The length of the bone 

 is V 9y"; its breadth at the upper end 11|"; d:o at the lower 11|". 



Nova Acta Reg. Soc. Sc. Ups., Ser. III. Vol. VI. 5 



