PROFESSOR FLOWER ON THE RECENT ZIPHIOID WHALES. 233 
sense middle forms, and that Berardius is, on the whole, the least modified or 
specialized form, and approaches, therefore, nearer to the true Dolphins, while Hype- 
roodon is the most specialized, being modified in the direction of the Physeterinz or 
Sperm-Whales. 
The principal points still to be ascertained with reference to the skeleton of Berardius 
are :—1. Whether in the perfectly adult animal any further ankylosis of the cervical 
vertebre takes place. 2. What is the number of the phalanges of a perfectly com- 
plete skeleton. 3. The form and size of the pelvic bones in the adult of both sexes. 
4. Whether there is any difference in the development or form of the teeth in the two 
sexes. 5. Whether there are any rudimentary, non-alveolar teeth concealed in the 
gum of either the upper or the lower jaw. 
Any one who may be fortunate enough to see the animal in a recent state should 
observe whether the cutaneous furrows on the throat, noticed in all other Ziphioids 
hitherto examined, are present ; and it need scarcely be added that all observations on 
the visceral anatomy as well as any facts bearing upon the geographical distribution or 
habits of this rare and interesting Cetacean will be of great value in elucidating its 
history and determining its true place in the natural system. 
DESCRIPTION OF THE PLATES. 
PLATE XXVILI. 
Fig. 1. Side view of the skeleton of Berardius arnouxi. 
Fig. 2. The skull and vertebral column of the same, seen from above. 
Fig. 3. The sternum, seen from below. 
All one sixteenth of the natural size. 
PLATE XXVIII. 
Fig. 1. Side view of the cervical, dorsal, and two anterior lumbar vertebrae. The lines 
from the Roman numerals below the figure point to the surfaces for the 
attachment of the ribs. 
Fig. 2. Anterior surface of the atlas. 
Fig. 3. Anterior surface of the fourth cervical vertebra. 
Fig. 4. Anterior surface of the fifth cervical vertebra. 
Fig. 5. Anterior surface of the sixth cervical vertebra. 
Fig. 6. Anterior surface of the seventh cervical vertebra. 
Fig. 7. Vertical median section of the skull. 
Ma, maxilla; PMzx, premaxilla; Vo, vomer ; WE, mesethmoid, united with the frontal 
above and the presphenoid below; Na, nasal; Fr, a number of loose wedge-shaped 
