. Catalogue of seals and whales in the British Museum. British Museum (Natural History); Seals (Animals); Whales. 170 BAL^NOPTERID^. (fig. 13, e, p. 111). Lacrymal bones thickened and rounded at the outer end. Lower jaw with a comparatively slight curve, and a low, obtusely triangular coronoid process. Neural arches of the cer'vdcal vertebi'ae high, and their spines well developed. Transverse process of atlas arising from upper two-thirds of side of the body, short, and deep from above downwards (fig. 41, p. 181; fig. 42, p. 182). On the hinder border of the under surface a median pointed tria
. Catalogue of seals and whales in the British Museum. British Museum (Natural History); Seals (Animals); Whales. 170 BAL^NOPTERID^. (fig. 13, e, p. 111). Lacrymal bones thickened and rounded at the outer end. Lower jaw with a comparatively slight curve, and a low, obtusely triangular coronoid process. Neural arches of the cer'vdcal vertebi'ae high, and their spines well developed. Transverse process of atlas arising from upper two-thirds of side of the body, short, and deep from above downwards (fig. 41, p. 181; fig. 42, p. 182). On the hinder border of the under surface a median pointed triangular process, directed backwards and articulating with the axis. Upper and lower transverse processes of the second to the sixth vertebrae 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 fii-st dorsal vertebrae respectively. Second, third, and fourth ribs with short capitular pro- cesses. Sternum very small, short,and broad, somewhat lozenge-shaped (fig. 12, 6, p. 110). Stylohyals very broad and flat (fig. 48, p. 184). " Type species, S. latkeps, Grayr—Flower, 1864,392,393. Flo-. 37. Sibbaldius laticops (from Rudolphi). Cuv. t. 26. f. 6. Professor Schlegel seems to think that the bifurcation of the first rib is a mark of youth, for he observes, " It appears that in old specimens of the Bahmoptera Physalns this bifurcation is grown to one solid mass This singular character has often induced me to believe that the first rib, as it is called, is only the horns of the os ;—Letter, 24th Auguf^t 1864. I may observe, in reply, that the full-grown specimen described as the " Ostend Whale " had the bifurcation well developed. * Dorsal jftn compressed, falcate, tw
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