DE. J. MUBIE ON THE WHITE-BEAKED BOTTLENOSE. 143 



O'l inch. The two rearmost teeth of the upper jaw are without 

 opposing mandibular ones; and the two foremost teeth of the 

 mandible are likewise free. 



2. Cavity of the mouth. — "Without exceeding the limits of a just 

 comparison, this region might fairly be likened to an inverted 

 funnel, inasmuch as it is relatively long, narrow, and V-shaped. In 

 this respect it differs from the more rounded cavity of the bluut- 

 nosed Glohiceps ; but so far as the lining of the mucous mem- 

 brane is concerned tliere is a closer correspondence between, 

 these two Cetacean forms. There is this difference, however, or, 

 rather, gradation, of structural change — that the rough anterior 

 palatine patch is of a decided /^ figure in Lagenorhynchus, and 

 runs back nearly as far as the twentieth tooth from the front. 

 The roughened patches on the mandibular rami are also very 

 strongly marked. The entire palate and faucial region are of a 

 pale flesh-colour ; and there is no distinct uvula, though, as in the 

 " Deductor," the isthmus of the fauces is very much constricted 

 and arched, whilst folds of membrane laterally bound it. 



The palate is flat fore and aft, but, if anything, rather trans- 

 versely concave. A lateral sulcus just within the gums, such as 

 is well impressed in the Ca'ing Whale, barely (if at all) exists 

 in the White-beaked Bottlenose. The interdental ridges, well pro- 

 nounced in the former, are less prominent in the latter Cetacean. 



The tongue is free at the tip for above an inch. In shape, 

 as might be expected from the outline of the bony parts, it is 

 much more narrow and pointed than in the Pilot Whale. More- 

 over, in the Bottlenose, it is a much softer organ. The dorsum is 

 less smooth, and the edges crenulate. 



The papillae circumvallatse are prominent. The fra^nal folds arc 

 numerous. 



3. Pharynx, Larynx, and neighhouring Structures, — The pharynx 

 at where the larynx arises is 3 inches in width. The channel is 

 narrowed in front, and with a baso-median elevation behind, being 

 sharper, at least posterior to the arytenoid cartilages. The 

 lining-membrane is very rugose both longitudinally and laterally. 

 The pharyngeal sphincter in this Bottlenose did not appear to 

 grasp the larynx so firmly as in the Globiceps dissected previously 

 by me. The larynx, which stands up, inclines to the left, causing 

 the passage on its right side therefore to be the wider of the 

 two, and leaving as much aa, or more than, 2 inches of free space. 

 The faucial mucous follicles are very numerous. These glands are 

 large, some as much as ^ an inch long, and contorted. 



