
HALE—PIGMY SPERM WHALE IN SOUTH AUSTRALIA 537 
the maxillo-malar sutures is one and two-fifths times the distance between the 
vertex and the level of the antorbital processes. The antorbital fissures are corres- 
pondingly more oblique than in the Sleaford Bay skull; they are slit-like and 
almost closed excepting at the fundus. 
The palatal surface is moderately convex; a relatively considerable portion 
(65 mm.) of the premaxilla appears between maxilla and vomer on right side and a 
sinaller part (50 mm.) of the left premaxilla is visible, On each maxilla an 
alveolar groove extends back from tip for a distance of 12 em. or so, neither of the 
furrows nearly reaching to level of antorbital tubercles; the right sulcus is a partly 
closed irregular fissure ; the left is deeper and is crossed not far from tip of rostrum 
by an oblique bridge. No teeth were discovered. 
The width between the postorbital process is greater than elsewhere. 



O i ) PE ON 
Fig, 10-11, Tooth from Port Victoria female calf and from Sleaford Bay example (approx. 
nat. size). Fig, 12-13. Tongue bones of adult female and calf from Port Victoria (14 nat. size). 
Fig, 14. Basihyal of Sleaford Bay example (14 nat. size). 
The tip of the mandible on one side and some of the teeth are damaged. 
The teeth are smooth, subequal in size, are evenly curved and apparently numbered 
thirteen in each ramus. 
In the tongue bones (text fig. 12) the basihyal is not subeireular as in the 
example illustrated by Benham (1902, p. 58, pl. iii) but is hexagonal; the antero- 
lateral and postero-lateral margins are concave; the anterior articular face is 
irregular and the posterior edge is barely notched near the mid-line; the bone, 
measured across the lateral angles, is one-fourth as wide again as long, The 
thyrohyals are suboval, longer than wide. The stylohyals are curved, slightly 
twisted bones; the articular face at the proximal end of each is broadly oval in 
