le; the construction of the neck
occurs below the ear and slightly behind it" (Anderson's 'Anatomical
and Zoological Researches,' p. 370). The other characteristics are
triangular flippers half as broad as long. The back fin rises behind
the centre of the back; it is comparatively small, falcate, curved
over the top to a blunt point, and concave behind. The line of the
back is sharp from this fin down to the tail. The ventral line is
the same for some inches behind the anus. The colour is dark
slaty-blue above, almost black, a little paler below, without any
streaks or marks, such as in _O. fluminalis_ and Risso's grampus.

SIZE.--From snout to caudal notch, about 7 feet.

I cannot find much on record concerning the habits of this dolphin,
and my own acquaintance with it is too limited for me to afford much
original information.

NO. 259. ORCELLA FLUMINALIS (_Anderson_).
_The Fresh-water Round-headed Dolphin_.

HABITAT.--The Irrawaddy river; Burmah.

DESCRIPTION.--This differs from the last in a "rather smaller, lower,
and more falcate dorsal fin, its more pointed and less anteriorly
bulging head, and rather shorter and broader pectoral fins"
(_Anderson_). The colour is a pale bluish above, and white underneath,
with numerous streaks, as in Risso's grampus.

SIZE.--From 7 to 7-1/2 feet from snout to fork of tail.

Dr. Anderson, who has fully described this species, says that he has
"never observed it in tidal waters, so that it is even more strictly
fluviatile than the Gangetic dolphin. From a little below Prome to
as far up as Bhamo, which is about 550 miles, as the crow flies, from
the sea, these animals abound. It is asserted by the Shans of Upper
Burmah that these dolphins are not to be found beyond a point thirty
miles above Bhamo, where the course of the river is interrupted by
rocks, and which they style _Labine_ or Dolphin Point, from the
circumstance that, according to them, it is the residence of certain
_Nats_, who there impose so heavy a toll on dolphins as to deter them
from proceeding upwards."

This dolphin is somewhat like its marine cousins, being fond of
gambolling round the river steamers. Solitary ones are seldom met
with, usually two or three being together. When they rise to breathe
the blow-hole is first seen; then, after respiration, the head goes
down, and the back as far as the dorsal fin is seen, but rarely the
tail flippers. They rise to breathe every 70 to 150 seconds, and the
r