282 THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIO. 
16.1% The length of the radius shows an equally close agreement—17.3 % in the 
Atlantic specimens, 17.5 % in the California skeleton. 
All the bones of the California skeleton are rugged and massive, and there 
can be no doubt that it represents the adult state. The bony rings formed by the 
lateral processes of the axis are very broad; its neural arch and spine are low, but 
thick and quadrate in form. The neural spines of the cervicals and the first two 
dorsals are low and triangular, but farther back increase rapidly in size and become 
broad, high, and quadrate. The first four pairs of ribs are furnished with capitular 
processes, of which those of the second and third pairs are longest. The penulti- 
mate pair of ribs is shorter than the last pair, and both are much straighter than 
the preceding pairs. The first rib is short and flat, and broad at the free end. 
The form of the sternum (see text fig. 32), though resembling in a general way 
that of adults of B. physalus, does not correspond exactly to the sternum of any 
specimen of that species thus far figured, as will be seen by consulting the figures 
on pages 140, 141. The anterior portion is broadly pentagonal, with an emar- 
ginate anterior border and a central vacuity. Attached posteriorly is a narrow 
segment, which near the middle of its length diminishes again in width rather 
abruptly. 
The scapula has the outline characteristic of B. physalus, the superior margin 
quite straight, but bent down sharply behind, while the anterior margin makes an 
angle of about 45° with the plane of the 
edges of the glenoid fossa. The acromion is 
large and club-shaped (see text fig. 97; also 
re pl. 7, fig. 3). 
( This skeleton is more noticeable for its 
agreement with L. physalus than for any 
distinguishing characters. The shape of the 
sternum, on the whole, presents the greatest 
difference, and in a part which varies so 
much as this the importance of this differ- 
ence cannot be strongly insisted upon. 
The measurements of the San Clemente Id. specimen, given below, are not as 
trustworthy as could be wished for, since it appears probable that the fins and 
other parts were more or less distorted by drying and other post-mortem changes. 
They are as follows: 
FIG. 97. 
Total length from tip of mandible to tip of flukes.............-... Big it. Oum. 
ADijay Ohi SovOybhe ey MON WNONE 4 aodase gpen nauoonuobdlobooasacnson < at Sif es 2ora 
Wengthiof pectoral) sfrompshoulder-jomt saeeeeceese ceo te eee ny 
Eleight ot dorsaletimiy varetpretemetetet fc or-tolesretolreeertabeiere tekarieiaieiorreratets Gh re ae O 
Breadthofifltlkesis: 3 f3 Sevmemracies inca ereeeceite aa oens  Seeemicles gq ae ™ 
Notch of flukes:to’ pestenion base vot dorsala- syst). reid etorrre Ges he 
Mipofmandible tole ye-seeere i) Seee eee eee eee ieee Gm 
Professor Osborn states that the whale, as preserved, was black, and quotes 
Capt. J. H. Hoe, who captured the specimen, to the effect that “the whalebone 
