THE WHALEBONE WHALES OF THE WESTERN NORTIT ATLANTIC. 125 
general color of the surrounding parts. A light line began at the ear and curving 
in a semicircle was lost in the region above the root of the pectoral. 
In adults the side and top of the head below and in front of the dark oblique 
eye-line is usually lighter than the back. 
There is commonly a light gray, or whitish, mark under the eye, especially on 
the right side, and sometimes a similar mark around the right ear. 
HAIRS. 
In the Newfoundland Finbacks, at the tip of the mandible and following the 
line of the symphysis on each side, are two rows of thick but soft whitish bristle-like 
hairs, about }in.long. There are about fifteen hairs in each row, Ina male fcetus 
6 ft. 5 in. long there were nine hairs on the right side of the lower jaw, in a row 
running obliquely downward and backward and terminating above the tenth right 
furrow. On the right upper jaw were twelve hairs, beginning about six inches from 
the top of the jaw and irregularly disposed. Around the root of each hair was a 
light-colored ring. 
DORSAL FIN. 
The dorsal fin in the Newfoundland Finbacks showed a considerable variation 
in size, as in European specimens. The following are the actual vertical heights 
in various Newfoundland specimens : 
BALA{NOPTERA PHYSALUS (L.). SNOOK’S ARM, NEWFOUNDLAND. DORSAL FIN. 
No. Sex. Length of Whale. Vertical Height of Dorsal. 
rte, Alo: 
Il Nooo geo bemood FO® LSvekes stots stool oof 8 | sos fers sans svsermat re Qe MM eveycten tieysieys:s ors 
2 CS Seal ar eee cnn GAs Bu rancne cst: BOW Gombe oar 
3 ORS Us aton cated otic OGRA rretace pte eroin |eieheu) areal eee ee TG Baan here Pica 
19 OF «Atal ersveht tire sole oes o OB tina Wasyate ior eists edllncios oisrawerstert ae 24 ¥ 
20 OM MMA | Se aerk Rea a ees (NF nthe Soong Rat OMS TER ERR NE aes 16 AS ahs Reem geht 
4 OO Pees arbiter NE TG -onerdce Gaga 20. Oe each enar evox 
13 ow, © Al eroaieecraaas (ORL eer Oh ver eRe th | ERROR Beene 18.5 iy 
9 Sie Ba once eo eee CQ We Lace S eter ovals Syst Core lovciecetcreena: Nees et ake hc ke 
8 Qi lererane ia stanctroclel eis Cit O Gectcans ores asia sssisvery Gintsaeas TON a> crab e we ola estas 
7 ORD) UPS Sa toa eee Ger Pind ade sordbinal oem rte cians i) 
The dorsal fin in these Finbacks is subject to a considerable variation in form, 
being normally falcate, but with the tip sometimes longer and more acute, and 
sometimes shorter and more rounded; the posterior margin in some individuals 
moderately concave, in others strongly concave. (See text figs. 1-7 and pl. 11, fig. 
5.) The variation is, however, less marked and striking than is found in the 
Sulphurbottoms. The normal shape of the dorsal in European specimens of B. 
physalus is well shown in Sars’s figure of his Lofoten Ids. specimen (77, pl. 2, fig. 
5). In color the dorsal fin agrees with the dark gray of the adjacent part of the 
back. In one instance (No. 2, Snook’s Arm) there was an irregular, pure-white 
blotch close to the tip of the fin, on the right side. 
