THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 275 
The averages of these several percentages, compared with those of the three 
Snook’s Arm, Newfoundland, Humpbacks which I measured, are as follows: 
MEGAPTERA VERSABILIS AND M. NODOSA. NORTH PACIFIC AND NEWFOUNDLAND. 
Measurement. North Pacific. Newfoundland. 
% % 
SOUL WOT Ces ose Can CeO ee Enos Ockcnare au ac ODN omer (3) Qiks | 24.7 
penne LOW OLES SS o<5. ois: «dyes cid Qieye Mien OM atau OE Mk ieror (3) 18.0 (2) 18.9 
eee AERDLC CUOTAL Siento censors ct Syore 6 ree vee isioae fe ME EOE caves (2) 33-9 32.4 
Menpthyotepectoral Sterile enc. cise acatelon Rast oe w stare heh sie 26.2 (2) 28.5 
Breadth “ Me SE eee BeOIIO Gen Ochna char ea atin orto cece 6.7 (2) 7.6 
Ellcipitrote @onsalipfitadejesers st ete 3, arose cates asbe mvcrarerateye a tasfeaoreu ornare (2) 1.9 (a) 233 
IBLEAC ERO fieflt KES y2c.iey <isysvstoysyscstate, naire evs le wielevegen sie miese stsiee eth orate (3) 33-0 (2) 37.6 
The agreement exhibited is quite close, except as regards the distance from 
the tip of the snout to the eye, and the breadth of the flukes. The reason for 
the discrepancy in the former measurement is not clear, as the photographs at 
command do not show any noticeable difference in the position of the eye. Though 
there is no doubt considerable variation in the actual breadth of the flukes, all 
measurements of this part both in the present and the Finbacks vary more than 
could be expected. There appears to be some difficulty in measuring the flukes 
accurately, or else different observers use different methods of measurement. 
The photographs of the Humpback taken in Henderson Bay, Puget Sound, 
Washington, September 5, 1896, reproduced in plate 41, figs. 1-4, confirm many of 
the characters given by Scammon, and afford others showing that the species bears 
the strongest possible resemblance to JZ. nodosa. 
Thus, the dermal tubercles on the head are arranged in three rows,—a median 
one and a double one on each side. The median row has about 6 tubercles and 
each lateral one about 10, as in AZ. nodosa. There is a cluster of tubercles at the 
symphysis of the mandible, and about 10 on each ramus. The dorsal fin is low, 
with a concave anterior border, and a knob-like tip, as in one of the Newfound- 
land specimens.’ A deep furrow extends backward from the mouth across the 
shoulder. The pectorals are white above with a median dark mark proximally ; 
below, entirely white. The flukes are undoubtedly more or less white below. 
Unfortunately, the pectorals are turned in such a position that the emarginations 
on the anterior border cannot be seen. ‘This whale, according to an account pub- 
lished in the Northwest Magazine May, 1897, was 45 ft. long; the pectoral fins 
about 9 ft. long; the flukes 13 ft. from tip to tip. 
In two photographs of California “scenery ” presented to the National Museum 
by Mr. Chas. H. Townsend, Humpbacks are represented, showing the pectorals. 
(See pl. 40, fig. 4; pl. 41, fig. 5). One shows the under side of the left pectoral, 
which is white for the most part, but with black in the proximal fourth, and a nar- 
row black posterior border, and black on the tubercles of the anterior border. 
* This same form is shown in the photographic views of antarctic Humpbacks published by 
Racoyitza in the cetology of the voyage of the Belgica, 1903. 
