88 THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 
and the character of the dorsal line. He appears to have intended also to point 
out osteological differences between fectirostris and tuberosus, but the language 
employed is so ambiguous that this is uncertain. There is, furthermore, a doubt 
whether he ever really examined the skeleton of twberosus, as will be explained later. 
The position which I take regarding tectirostris is (1) that Cope at the time he 
first described it did not evince any knowledge of the fact that one kind of Finback 
is common on the east coast of the United States, and that (2) there is, therefore, no 
probability that he intended to establish a second species similar to, but somewhat 
different from, the common species; consequently, that (3) the type-specimen of 
tectirostris does not merit any more attention than other specimens of the common 
Finback, unless on comparison of them all together the type of ¢ectirostris seems to 
stand apart from the others. As to whether the latter condition is found will be 
fully considered later. What we really wish to ascertain is whether the com- 
mon Finback of the Atlantic coast of the United States is the same as, or differ- 
ent from, B. physalus (L.) of Europe. The typeskeleton of . tectirostris is 
figured on pls. 1, 2, 4, 5, and 6. 
The following measurements of the type-skeleton made by myself in 1900 
include those made uniformly for all the specimens examined, and others which 
appear to be of importance in this particular case : 
SIBBALDIUS TECTIROSTRIS COPE. (TYPE.) 
Shull: Inches. 
Motalilencthi(Gtraipht) esterase eee er erieieterstecsteeete 121.0 
Greatestibreadths(Gquamosall) panes aero eee 54.0 
Breadth of orbital process of frontal at distal end........... Soy aim 
engthrofrostname (straight) ha eeeeeeeeeis eerie eeerer 80.75 
Breadth) of rostrum at middle (curved))....:-..0-+.+-.s-e.- 26.57 
Mengthvofmasalspimemediang lime erm eeeeecieeieetire ec Te 
Breadth of the two nasals at the distal end ................ Bag 
Hengthoftmeandibleystralghta.mrntiiieettlsisierieiteteiens le isererele III.0 
of As ag CHAK Ke aceod onan snesdc pn dood aaganee 120.0 
Depthyotmandiblevatmiddl ey. erect ate rere 9.5 
Skeleton : 
Greatest breadth) oftaxds 2 -j- sa) sisso)of- le nlclelsts\elosercletelel-sololeeierels 25.0 
ie Neh em cate cs, &crapercteyecteuetelorsisisuasteruslaerc es imterateters T3125 
Depthroficentramtotaxiste a. ie eee niece eee Ole 
Greatest ibreadthyofenst; dorsal ssn eeiecieere eee 22.75 
ie MMC bee os a a etea tacal eat s agate eae rece meereetettehets 13.2 
Depthiof centrumvoferst dorsal. steamers eee AS > 
Greatest breadthvotensh lumbarssceremteleclsisererietererersnsteieteterare 32.0 
Se selp hitters TeM cat dleeinc tune Ce aot ye eI EE 20.5" 
Depthvorcentrumvor mst lumbar. see ieee eee Ths | 
Greatestibreadth of msticaudall.. teri serietieteici=cireieree cere 24.0° 
“ Shelghts peter |” fo)” steve Seaconcunaaie buccteten cs einetis 21.0" 
Depthrokicentrumyotensticatidallereys-yre eerie ei sete eietel: 9.25" 
Greatest breadthiot scapula. crt. -lecie)el- -teisieltetateieeae ieee rave 32.75 
re depth “* ae acs oO ae oko aaah 19.5 
Wengthiof acromion, inside) (straight) ener seen cere 7.0 
Wength’ of radins\withepiphyses-ri- cases eae eee 24.0 
Wength\ of radius ;withoutepiphyses- = settee acres eat 23.0 
© Sila sswithse pyphySes\.aqw ocasoee eee aaroeerenereeion 22.25 
SSS withoutyepiphy Ses: tae ctcicle ieee stots 21.5 
< | So ihumerusi(Straight) eos seneee eens cece 15.0 
* Tip to tip, least. “Median = 12.25 in. ” Posterior, 
? As mounted. * Median, posterior. * Twice one half. 
* Opposite distal end of inner margin. ° Median, anterior. * Anterior. 
