THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 233 
SKULL. 
Measurements of European skulls, which can be compared with one another, 
have been recorded in the case of the type of J. longimana (by Rudolphi) and the 
Tay River whale (by Struthers). 
Measurements of the skull of the Greenland Humpback can be obtained from 
Eschricht’s figure (39). Of American specimens, I have measured the skulls of the 
types of AZ. osphyia and M. bellicosa, and of two other specimens from Cape Cod, 
Mass. These various measurements are brought together in the following table: 
MEGAPTERA NODOSA (BONNATERRE). EUROPEAN AND AMERICAN. SKULL. 
se | 3 : : Salter tes 
eS th oa = & e é = 
Eda |] So AS S B 4 j 
Peedi a sits |e ee Mec 
Boa] oe ze rae ee |e 
oneal seers oo | So Oral eeee 
Bes] pe | #8) 8 | ge8 [Ese 
see) a | Sa) ee | S28 |fe8 
SRM A palo Cire actterctcrey crete io eV anes evcfeneer cere ance, e aie enc stouers $ Bi Pulimrarrecs) sel cvandl Uleereresers i) Th 
otalvlencthnofwhalesse as 2 ctsaciscci ts Anas AGUAS PAO ROL |Ilz.<taraishe| cr evsusesles | rotors toners leis Foren 
Fs memes tSKGLELOms a. Cpoers ane cverco se eee Gy > \eXo) OAS I! elle occ 33/ 10”+] 27’ 0” 
Menethvotisknuil’ (stratcht)haseiseae i seis eres cer 144) |e Alera se anneal eemmay gi" 
a = a : % % % % % 
Createstimeadthn Samm osal) eq seeter ete citeeivarscire| eater Ke) |) Green |) eRe) 60.1 58.2 
Breadth of orbital process of frontal at distal end 
(Gupxa-onbitallborden) ise see ect ea oeer O10), |@ .g:6))|), Log) ||) TOs 8.4 8.2 
Wen gthvormostrumy (Straight) ass0 yeeeeee ners oe 66.77| 67.6 | 66.0 | 66.4 68.6 68.1 
Breadth of rostrum at middle (curved)............ Gj || BRAC) |) 2948) |) BO) 22.6 23.0 
IBeMoEhrO fy MASAISZ tysrenevscicisielele,cyerssve sis vieersrouo ess Seail| eytek Wo Noga 7.8 7.0 a 
Brerdtnnote2 masalsratedistall endless eal erare ici rare eiseicecrs Has * ladeo bee 
Length of mandible (Straight). Seca coe nce er OR= || CEG || ORIG Vaase oc 99.1 96.6 
; (eunvied) ir asim ners cca amon ee eeioe HOY). || MLE \lna onan 108.8 | 107.7 
Depenrormeandiblerataniddlesemweeeneee eerie |e cee 8.0 Sabai preveneters 8.8 8.8 
It will be seen that there is no marked difference in the proportions of the 
American and European specimens (including the type of JZ longimana) except in 
a few instances. The breadth of the rostrum in the type of JZ. longimana, meas- 
ured on Rudolphi’s figure, and therefore flat or straight, is considerably less than 
in the American specimens. That this is probably an error in the figure, rather 
than a real difference, appears from the fact that in the skull of the Tay River 
whale the rostrum is as broad as in the American specimens. 
The Greenland Humpback, from Eschricht’s figure, would seem to have shorter 
and very much narrower nasal bones than the other specimens (pls. 29 and 32, figs. 
1 and 2). It is possible, of course, that this may be a character of the Greenland 
‘ Rheinland feet. * Breadth across distal end of outer margins. 
* From figure. *Straight, as mounted; is too much curved 
* Straight. ; and lacks 4 or 5 caudal vertebre. 
