260 LILLJEBORG ON THE 



has, in the middle, a concavity or notch, which is deep and a little oblique. A large wing-like 

 process projects from each side of its middle part or corpus, and is obtusely pointed. Its poste- 

 rior obtuse process or point is shorter than the wing-like processes, and somewhat wider 

 than the parts of the manubrium projecting on the sides of the anterior notch, and has on 

 its lower side a very inconspicuous longitudinal ridge.^ The ribs of this skeleton are rather 

 thick, and much larger than in the skeleton in Copenhagen, probably in consequence of its having 

 been older.^ The first rib, which is more curved than the others, and of the same length as the 

 last, is Avithout a collum at its upper dilated end, and does not show any indications of being 

 forked. Its lower end, united to the sternum, is also single, considerably dilated, and 

 wider than the upper end. The same rib in the skeleton in Christiania and in the skeleton in 

 Copenhagen was of the same form ; the 2nd and 3rd pairs of ribs have a small collum, but do not 

 reach the corpus of the vertebræ by their capitulum. Circumference Of 1st ribs at upper end 

 1' 4", and at the middle 1' i". The scapula resembles very much that of other Balænopteræ ; its 

 Avidth is more than 1^ times its length. Processus coracoideus and acromion strongly developed, 

 and almost parallel. Caput ossis humeri slightly obhque. This bone is 1' broad at its lower end. 

 The lower ann-bones (radius and ulna) differ but little in length, but the former is perceptibly 

 broader than the latter ; the difference in this respect is, however, less than in Companyo's figure 

 of the bones of the anterior extremity ; the former is 6", the latter 4i" wide in the middle. The 

 carpal bones are 5 ; 3 in the upper and 2 in the lower row.^ The ossa metacarpi are 4, and fingers 

 the same number. The phalanges were incomplete, as the terminal ones were missing on almost 

 all the fingers.'* The pelvis and hyoid bones resemble in form very nearly the figures of the 

 same bones given by Companyo ; the former have three processes, one of which is longer and 

 narrower than the others ; the latter has, in the middle of its anterior projecting part, two pro- 

 cesses separated by a deep and narrow notch, to which the anterior cornua are united by cartilage. 

 A long straight process, which is obtuse, projects behind these from each side of the corpus. In 

 regard to the skeleton at Copenhagen from Greenland, I will add, it is that of a young animal 



The sternum of tliis wliale seems to be subject to much variation of form. The anterior middle 

 part (manubrium) is sometimes very little or not at all projecting, and the notch there hardly 

 perceptible, or even wanting. There are sometimes in its place one or two small perforations. The 

 ■wing-like processes are sometimes shorter and wider, and the posterior process is sometimes shorter, 

 sometimes longer, &c. The sternum preserved in Christiania has not the anterior part projecting, 

 and the incisure was much smaller, the wing-like processes wider and shorter, and the posterior 

 process longer. The sternum of the skeleton from Greenland, in Copenhagen, was more oblique, 

 without either the notch or the perforations in front, but was somewhat projecting at this part. Both 

 the lateral and the posterior processes were wider, and the former were shorter. The one described by 

 Van Beneden much resembles the last mentioned. The sternum of Companyo's rorqual has the 

 anterior part (manubrium) larger and more prominent, without a notch, but with a perforation, and the 

 lateral processes are narrow. 



"" The measurements of the length given in the table are taken along the curve on the 

 outer side. 



^ Companyo states that there are 6 bones in the carpus, but his figure shows only 5. 

 I counted fi — 7 phalanges on the 2 middle fingers, which were about equal in length, on the 

 skeleton from Greenland at Copenhagen. The forefinger, which was longer than the little finger, had 

 5, and the latter 4 phalanges. 



