MAMMALS FROM BURMA 947 
112. Oreella brevirostris, Owen. 
O. fluminalis, Anderson, P. Z. S., 1871, p. 143. 
a. Perfect skeleton. R. Irrawaddy near Bhamò. 
Total length before skinning 2070 mm.; circumference behind 
pectoral fins 1270 (Fea). 
Dimensions of the skull, the largest recorded: Basal length 
293; greatest length to back of condyle 320 (= 12.65 English 
inches); greatest breadth 214; length of snout from median 
point between preorbital notches 137; length of snout from 
anterior edge of superior nares 183; breadth between preorbital 
notches 117; greatest breadth of superior nares 48; greatest 
breadth of brain-case between temporal fossae 163; length of 
pterygoids 57 ; 
Teeth IT The five posterior teeth on each side of the 
upper jaw are set in a line internal to that of the rest, are 
markedly smaller, and are less deeply unbedded in the jaw, so 
as to be easily pulled out and lost in the cleaning of the skull. 
This I presume has actually taken place in the skulls pre- 
viously described, all of which are said to have only 12 or 14 
teeth on each side of each jaw. 
Our knowledge of this interesting dolphin rests almost entirely 
upon the magnificent monograph written by Dr. Anderson (1), 
in which a full and most valuable account is given of its ana- 
tomy, osteology and placentation. On one point however I am 
constrained to differ from the author of that monograph, namely 
as to the specific distinetion of the dolphin of the Irrawaddy 
from that of the Bay of Bengal. The material examined in 
making this criticism consists of the following. 
1. Specimen a from Bhamò, with which Signor Fea has sent 
a careful drawing prepared and coloured from the animal in 
the flesh. 
2. A skeleton from the Irrawaddy, named by D." Anderson 
himself (O. flwminalis, specimen a of the List of Cetacea in the 
British Museum, 1885). | 
(1) Zool. Yunn. Exp. Mamm. pp. 358-416, pls. XXV-XLIII, 1878. | 
