. Catalogue of seals and whales in the ... Museum. 286 the upper ends of the condyles are 1" 3'" apart. They are low and sessile. " The foramen magnum is vertically oval, widest above, and notched at the middle of the upper border; its length, to the end of the notch, is 2", its breadth 1" 3'"; the breadth across the broadest parts of both condjdes is 2" 9'".. Skull of Orca hrevirostris. " The paroccipital (4), an exogenous growth of the exoccipital, forms the back part of the otocraue, towards which it is sinuous or slightly concave,
. Catalogue of seals and whales in the ... Museum. 286 the upper ends of the condyles are 1" 3'" apart. They are low and sessile. " The foramen magnum is vertically oval, widest above, and notched at the middle of the upper border; its length, to the end of the notch, is 2", its breadth 1" 3'"; the breadth across the broadest parts of both condjdes is 2" 9'".. Skull of Orca hrevirostris. " The paroccipital (4), an exogenous growth of the exoccipital, forms the back part of the otocraue, towards which it is sinuous or slightly concave, and terminates below in a thick, rough border: this border is divided by a notch from the otocranial plate of the basi- sphenoid; and just within the verge of that notch opens the canal for the ' nervus vagus.' " The superoccipital (3) rises and expands, as in other Delphinidae, into a broad and lofty convex plate, reaching the vertex and there articidating with the jmrietals (7) and interparietal (7*): a low median ridge divides vertically the upper half of the superoccipital. On the inner surface, 1" 6'" above the foramen magnum, a vertical triangidar plate of bone descends into the falx ; it is thickest behind, where its base is grooved transversely by the lateral sinus. " The alisphenoids coalesce with the fore part of the lateral border of the basisphenoid, in advance of the otocrane, of which it forms the anterior wall or boundary: the base of the alisphenoid is notched posteriorly (Yr) for the third, and anteriorly (m) for the second division of the integument; it expands as it passes outwards, slightly rising to join the parietal (7) and frontal (11), and to overlap the process of the squamosal continued mesiad from the glenoid cavity. The suture between the interparietal (7*) and superoccipital (3) is obliterated, and that with the parietals is partially so. The suture between the parietal and superoccipital remains at its lower half, showing that a
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherlondon, bookyear186
