
534 RECORDS OF THE S.A. MUSEUM 
Thus it would seem from available evidence that the fin is subject to considerable 
individual variation; on the other hand more adequate information regarding 
this and other features may show that geographic races or subspecies exist. 
NOTES ON EXTERIOR OF FOETUS. 
The Port Victoria foetus is a male. The most striking general features as 
compared with the adult are the shape of the relatively large head and the anterior 
position of the nostril (text fig.5). From the vertex to the front of the snout the 

Fig, 5. Male foetus from Port Victoria; whole animal from the side, and anterior and 
ventral views of head (2% nat. size), 
head slopes downwards very much more abruptly than in the more advanced 
foetus recorded by Allen (1941, fig. 1) and is more like the large foetus (1,097 mm.) 
described by Schulte and Smith (1918, p. 7, fig. 1). The crescentic nostril lies 
for the greater part to the left of the mid-line and is directed upwards to the left 
(text fig. 5) ; its lowest point is barely above the level of the upper edge of the eyes. 
The last-named are slightly asymmetrical as regards position, the left eye being 
1 mm. closer to the front of the snout than the right. Jn advanee of, and imme- 
diately below each eye is an obliqne row of six minute, backwardly curved 
vibrissae, each of which projects from a pit; the second and third hairs of the 
