Inches.
Girth just in front o f pectoral flippers . . . . • • 39-25
„ half-way between flippers to genital a p e r t u r e .................................................................... 41*50
„ round the anal r e g i o n ................................................ 28*00
„ at the base of the t a i l ............................................................................................................ ......... 9 00
Measurements o f the second male, obtained by Captain Cooke at Bhamd, July 1876.
Inohes.
Tip of snout to notch of tail along the side . . . . . . . . . . . 86*05
„ • „ to middle of dorsal fin along the-side . . . . . . . . . 49*00
Tip to tip o f caudal flippers ................................................................................... 24*05
Length of pectoral flipper in straight line along centre . . . . . . . . 15*00
Greatest breadth of pectoral flipper . . . . . . . . . . . 6*05
Tip of snout along curve of head to centre of blow-hole. . . . • • . . 10*00
Transverse breadth of blow-hole ........................................*. • . . 1*05
Basal length of dorsal fin . . . . . . . . . . . . . 9*00
Length o f dorsal fin from base anteriorly to tip posteriorly . . . . . . . 6*05
„ „ „ „ . „ to centre of n o t c h .................................................................. 6*00
Depth through centre . . . • • • • • . . . . . .. .2*07
Angle of mouth to anterior angle of e y e ........................................................................................ 1*08
Length of gape along upper jaw 5*06
„ of eye . . . . . . . . . . . . . > 0*07
Posterior angle o f eye to ear........................................................................................................... 3'01
Tip of left horn o f blow-hole to angle of mouth along curve of h e a d ................................................7*00
„ on right side . . . . . . . . . . . . . . . 7*08
„ of left horn to left of mesial line o f back . . . . . . . . . 1*00
„ of right horn to right of ,/ ■%.; . . „ . . . . . . . . . . 1*05
• " ■ „ of left anterior to right horn . . . . . . . . . . . . 0*05
Centre o f anal orifice to notch of tail along ventral surface . . . . . . . 23*08
„ „ „ to middle o f mammary slit . .......’ ................................................. . 3*04
„ o f mammary slit to posterior margin of genital s l i t .................................................................. 3*06
Length o f mammary slit . • . . . . . . . • . . .. 0*08
Distance (transverse) between mammary slits ..............................................0*25
Length o f pelvio bone, left side . . . . . . . . 2*09
Anterior, end of pelvio bone distant from chevron bone o f 16th lumbar vertebra . . . 1*01
„ „ „ „ from centrum o f 16th lumbar vertebra . . . . 2'®h
„ extremity distant from external surface ........................................................ 3*00
Posterior „ » » » . • • . . . . . . . 1*05
Anterior „ of pelvic bone nearer to the mesial line than the posterior end . . . 0*26
Distribution.—I t is a remarkable circumstance that this dolphin has never yet
been observed in those portions of the Irawady under the influence of the tides,
(see Map), which would seem to indicate that it is more strictly fluviatile than even
Platanista. On the two different occasions I sailed up the river from Eangoon
to Bhamd, my upward voyages were made in the months of December and
January, and I returned in the months of September, October, and March, so
that my observations have extended over nearly five months, embracing those
periods when the river was at its highest and at its lowest level. On these
occasions I had the question of the distribution of the Irawady dolphin steadily
before me, and took the precaution daily to appoint certain of my Zoological
collectors to observe, in our upward progress, the first appearance of this Cetacean,
besides giving a considerable portion of my own time to the observation. In
no instance have I seen a single example of this dolphin in the delta of the
river; the lowest point at which I saw it on my first visit was in the deep