84 Guide to Whales, Porpotses, and Dolphins. 
coloured from nature, of an adult female taken in the mouth of 
the Humber in November, 1885. A skull is shown in the wall- 
case at the south end of the gallery, which exhibits the series of 
large and powerful teeth characteristic of the genus, and likewise 
displays the blunt and rounded form of the muzzle. In general 
colour the Killer is black, but there is a pair of oblique white bands 
on the hind part of the flanks in very nearly the same situation 
as in the under-mentioned Heaviside’s Dolphin. 
The False Willer (Psewdorca crassidens), first made 
Se ps known to science on the evidence of a skull dug up in the 
iller. , he = 
fens of Lincolnshire, is nearly related to the Killer, from 
which it differs by the smaller number (about ten pairs) of 
teeth and the cylindrical form of their roots. The flippers, too, are 
smaller, and of a narrow and pointed form, while the back-fin is 
much lower (fig. 19). The shape of the head is also different, 
being high in front of the blow-hole, and compressed anteriorly, 
with the snout truncated. More of the neck-vertebre are 
united together than in the Killer, and the lumbar vertebrie 
are also proportionately longer. In colour this Cetacean, which 
has been met with in seas so widely separated as those of 
Denmark and Tasmania, is entirely black; its length is about 
14 feet. 
The skeleton exhibited is from an individual out of a ‘“ school” 
which visited Adventure Bay, Tasmania, some time before 1866. 
Specimens have been taken on the coast of Travancore, India, 
from one of which the accompanying illustration (fig. 19) was 
taken. 
In the Ivawadi Dolphin (Orcella, or Orcaella, fluminalis), 
and in the closely allied species (O. brevirostris) from the 
Bay of Bengal, there are from 12 to 14 pairs of small, 
conical, pointed, and rather closely set teeth, occupying nearly the 
whole length of the jaws, which are about as long as the rest of 
the skull. There is a small back-fin, placed somewhat behind the 
middle of the body; and the flippers are of medium length, with 
all the bones of the digits, except the first joints of the second and 
third, broader than long. The species first-named is found in the 
Trawadi River, Burma, at distances of from 300 to 900 miles 
from the sea. 
Irawadi 
Dolphin. 
