1864.] IN THE MUSEUMS OF HOLLAND AND BELGIUM. 393 
and lower transverse processes of the second to the sixth vertebree 
inclusive well developed, broad, and flat (united at their ends in the 
adult, except the sixth?). Lower process of the sixth short, broad, 
and much twisted on itself. Head of the first rib bifurcated into an 
anterior and posterior division, articulating with the extremities of the 
transverse processes of the seventh cervical and first dorsal vertebrae 
respectively. Second, third, and fourth ribs with short capitular 
processes. Sternum very small, short, and broad, somewhat lozenge- 
shaped (fig. 8). Stylohyals very broad and flat (fig. 17). 
Type species, S. laticeps, Gray *. 
Sternal bones of Fin-Whales of different genera. 54,th nut. size. 
Fig. 7. Physalus antiquorum. Alexandra Park. 
8. Sibbaldius schicgelii. Mus. Leyden. 
9. Balenoptera rostrata. Mus. Roy. Coll. Surg. 
C. Balenoptera, Lacépéde, pars. Total number of vertebre 
48-50. Ribs 11 pairs. Orbital process of frontal almost as broad 
at the outer end as the base. Nasal bones rather narrow and elon- 
gate, truncated at their anterior ends, convex on the upper surface 
in both directions (fig. 6). Rami of lower jaw much curved, and 
with a high, pointed coronoid process. Cervical vertebrae usually 
separate ; but this family character not unfrequently departed from 
* Dr. Gray, with good reason, refers the Whale stranded at Charmouth, in 
1840 (Sweeting, Proc. Zool. Soc. 1840), to this genus. There is not, as far as I 
am aware, a skeleton or skull of a Sis/aldius preserved in any of the museums 
in this country ; we possess, however, at the College of Surgeons a lower jaw, 
pair of first ribs, pair of scapulze, atlas, and some other vertebra. Their origin 
is unknown. 
