230 LILLJEBORG ON THE 



any distinct limits, the one oblique, nearer the back, from about the blowhole to under the begin- 

 ning of the dorsal fin ; the other straight with the side, from the end of the dorsal fin to somewhat 

 behind the vent ; from the eye to the pectoral fin whitish ; all the fins black on both sides." This 

 specimen had, according to Sundevall, 15 pairs of ribs. 



Two skulls of this species from the coast of Bohusliin were presented to the Zoological 

 Museum of Lund by the late Pastor C. U. Ekstrom, and are now preserved there. I have made 

 the following observations from the larger one, viz. : — Length 22" ; width across the projecting 

 edges of the fore part of ossa zygomatica 10"; smallest width of pars occipitalis of the occipital 

 bone 7,"; foramen magnum 1||" high and wide, forming an acute angle above; os zygomaticum 

 5|" long ; ossa pterygoidea each 3i" long and If" wide, with their posterior edges forming an even^ 

 rather shallow furrow; beak 12" long, and 5if wide at the base; lower jaw 19^, one of its 

 teeth lines 10" long, and its height at the processus coronoideus 4|". The intermaxillary bones are 

 separated above by a deep furrow, and form in front, on the upper side of the jaw, a conspicuous 

 ridge, sloping at the sides, and gradually running into the upper surface of the superior maxillaries, 

 Avithout any distinct furrow between them. Their triangular area before the blowers is slightly 

 concave forwards. The hinder edge of the maxillaries extends somewhat behind the nasal bones. 

 The tubercle on the frontal bones, in which the nasal bones are situated, is low ; also the sutura 

 lambdoidea. There is a conspicuous longitudinal ridge along the pars occipitalis. The 

 vomer visible only at one place in the palate, and not until nearly 4" in front of the angle 

 formed by the palate bones.^ Teeth ||zg, rather acute, and not worn down, with the points bent 

 inwards ; one of the hinder ones in the lower jaw ll" long and f thick. The teeth in the other 

 skull were of equal number.^ A. skull of a younger animal, and the incomplete skeleton pre- 

 served in the Marklinean Museum of this place, from unknown locality, but probably brought 

 from Bohuslån or Norway by the late Acad. Adj. Marklin, show the following proportions : — ■ 

 Length 14f . Beak 6f long and 4i" wide at the base ; width of parietal bone 6f between the 

 upper edges of pars occipitalis (being the smallest width of this bone) ; width of skull across 

 the temporal bones 7|", its width across the anterior dilated parts of ossa zygomatica 6|" ; width 

 of the triangular area on the intermaxillary bones in front of the blowers Sf, its width, therefore, 

 somewhat greater than half the length of the beak, the area but slightly projecting, being level near 

 the blowers, and concave before them. The intermaxillary bones do not touch the nasal bones ; the 

 right one, the hinder end of which is broken off, seems to have been longer than the left. The 

 vomer is visible in the palate only at one place, where its foremost point runs between the hinder 

 ends of the intermaxillary bones, which are visible in front of it. The lower jaw is 11 J" 

 long, and its rows of teeth each 5f. The teeth are quite close together, and are 24 — 25 on each 

 side of both jaws. This skull is of a less elongated form, and the nose much shorter than in the 

 former, a natural consequence of its being younger. The nose is shorter than the rest of the 

 skull, and its length is not twice its wådth at the base. I counted, on the before-mentioned 

 skeleton in the Physiological Museum in Copenhagen, 12 dorsal vertebræ,'' 17 lumbosacral ver- 



^ G. Cuvier states that it appears in 2 places. 



- Camper has iu his figures 24 teeth on each side of the upper jaw. G. Cuvier states 21 — 23 

 teeth. Schlegel says the normal number seems to be 24. Gray mentions U,. Nilson 22 — 24, 

 and Clarke gl|?. I counted ||Zg teeth in a skeleton in the Physiological Museum in Copenhagen. 



" Probably 2 or 3 pairs of ribs were wanting. 



