176 THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 
BALAZNOPTERA MUSCULUS (L.), NEWFOUNDLAND. GIRTH, 
are Transverse 
Semi- ly. ; 
emi-Circumference of Body TDigtleter of Body: 
No. Sex. Length. 
At Tip of At At At At Tip of | At Head of 
Pectoral. Navel. Anus. Penis. Pectoral. Humerus. 
=— at ee | 2 
18 4 WO. a seuss 9’ 6" TH fo) aa 
9 fc) Fe Owe fee Sac eos We eon 
5 3 68' 3" 17/0” Says Bo a os ere oie 
7 g 67 oO" Wee ake aaa Asus | 6' 34” ho 
In Nos. 18, 9, 5, the girth at the tip of the pectorals, or the greatest girth, 
would be, by calculation, 34 ft. 4 in., 36 ft. 4 in., and 34 ft., respectively. 
ABDOMINAL RIDGES AND FURROWS. 
The abdominal or thoracic ridges and furrows in this species, as in B. physalus, 
extend backward from the mandible to the navel, and between the pectoral fins and 
eye extend upward nearly to the level of the latter. The ridges also anastomose 
irregularly, and toward the posterior end many pairs unite, so that the total num- 
ber here is much less than it is farther forward, and the breadth of each much greater. 
The breadth of the larger ridges between the pectoral fins in the Newfoundland 
Sulphurbottoms is about 23 inches. (PI. 14, figs. 4-6.) 
In number the ridges vary as in B. physalus, and the totals do not differ ma- 
terially from those of that species. In different specimens of Newfoundland Sul- 
phurbottoms the totals were as follows, and were obtained by counting from the 
median line to the root of the pectoral and multiplying by two: 
BALAENOPTERA MUSCULUS (L.). NEWFOUNDLAND. NUMBER OF ABDOMINAL RIDGES, 
No. Sex. | Total Length. Number of Ridges. 
14 2 | 77. 2” 66 
4 2 73 6" 68 
18 é 72) 2) 62 
9 g | HEM °” 88 
1 B | itl (5) 68 
2 a a1! o” 84 
= fo} t yu 68 
a * | bor er 68 
3 65' 8” 62 
y + | 62) o” 58 
8 2 61' o” 84 
The quite remarkable variation in number of ridges appears not to be corre- 
lated with sex or size. 
