THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 85 
men was adult. It can also be argued that the black color of the body was 
the living color and not due to change after death, which strengthens the case in 
favor of B. borealis. 
In spite of these apparent agreements with 4. borealis, my own opinion, as 
already stated, is that S. tuberosus is to be associated with BL. physalus. It was 
assigned by Van Beneden in 1889 (7, 205) to B. borealis, but his evidence was 
presumably derived entirely from Cope’s description. 
4. SIBBALDIUS TECTIROSTRIS Cope. 1869. 
Original description: Proceedings, Academy of Natural Sciences, Phila., 
1869, p. 17. Presented for publication, March 9, 1869; published, July 20, 1869. 
Type-locality : Near Sinepuxent Bay, Maryland. Came ashore in the winter 
of 1868-69; had been dead some time. 
Type-specimen: Nearly complete skeleton of afyoung female between forty- 
seven and forty-eight feet long, preserved in the museum of the Philadelphia 
Academy of Natural Sciences. 
The history of this species is, fortunately, quite clear. The individual which 
formed the type was a young female which came ashore near Sinepuxent Bay, 
Maryland, in the winter of 1868-69. It had been dead some time when found. 
The carcass was stripped by Joshua Carey. The skeleton is in the museum of the 
Philadelphia Academy of Natural Sciences, where I saw and measured it in 1899. 
It is nearly complete. The characters given by Cope for the specimen (83, 16-20) 
are as follows: 
Dorsal fin of ordinary form, compressed, with a long base, and situated two- 
thirds the length from the muzzle; dorsal line behind it smooth. 
Color above uniform black; exterior face of pectorals and “stripes along the 
gular plice” also black. Belly white, separated abruptly from the black, forming 
a “water line.” Posterior (inner?) face of pectorals in the distal half, and under 
surface of flukes white. 
Baleen short, of a dark lead color, the inner and shorter margin white for 
varying widths; bristles fine. 
Skeleton.—‘ The individual is in the young stage, since not only are all the 
epiphyses of the vertebrae separated, but those of the humerus also.” 
“The axis presents below no surface adapted to a tuberculum atlantis. The 
median portion of the anterior face of the centrum presents a low conic projection, 
the processus odontoideus. The di- and parapophyses are united distally, embracing 
a large ring, whose outside longitudinal diameter is 2 the transverse diameter of 
the centrum of the same. The neural arch presents no spine, but a pair of lateral 
prominences like rudimental zygapophyses. The parapophyses of the remaining 
cervicals are long, except on the seventh, where they are almost wanting. The dia- 
pophyses are long in all, longest and decurved on the seventh, where it stands 
above the parapophysis of the sixth. They are nearly united with the para- 
pophysis on the third cervical, and are no doubt fully so in mature age. The 
fourth cervical is lost, but it is scarcely probable that it presented a complete ring 
for the transmissal of the vertebral artery, ete. There are no rings attached to the 
vertebrae from the fifth inclusive. The centra are all transversely oval.” 
