THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 133 
BALAENOPTERA PHYSALUS (L.). EUROPEAN AND AMERICAN. SKULL. 
Gas Saw lgee lS 33 = d> | w= | fag | #2 
age | Ses |ase | =e | a8 | ~w | sé | fa | S20 | Se 
See (none | eee | Su abd eo si | SE | ui 
Soe | Spas | $88 | kes | 28 aes ae Re ecae | OS 
SEs q ase ‘SE acs aoe GoD oP o. Op 
Bee cecal ce gerseui se g)Sa | SP | ee 28s los 
B<= | S2=" | Gee leo) || ee Sales oes ies) oe 
> % = = H = 
Sexvand (agi <peic'ee.n1s,< Grads) | dread |frceridem eeetcr. 6 ad 2 jr abs Jr 
( betw 
Total length of whale.....|...... 72! 2"' | 600" |4 cae 50 0 68' CGN Nenana |lacmaod |eoeaos 
60' 0 
36 CY SSEO EON, gull Oe yee lAseaes lll heeos: Ill soon 62’ ro"'+-]...... ATA MW ecepstararom [Ncckaresoce 
straight 
Length of skull (straight)..| 186" 184" 168" 156" 145.0" 194! 144" 125" rent! 110.5" 
Greatest breadth (squa- % % % % % % % % % % 
MNOSAl) erajeyelatiie tershsherersiane 46.2 Boo esas 46.1 45.8 48.0 46.5 48.0 44.6 47.0 
Breadth of orbital process 
of frontal at distal end..| 9.1 QB Iistsis ces ieee 0 10.78 TOV Zam llierest ster 10 4° 10.0° mise 
Length of beak (straight)..| 71.0 72.3 69.0 69.3 66.2 69.1! 69.4 67.2 66.1° 65.2 
Breadth of beak at middle 
(Guna) socescobedades 19.3 18.0 19.6 23.1 18.6 21.4 19.4 20.0 27.9 19.4 
Length of nasals........- 3.8 4.6 mao) I agoane Gee ll ceo 4.2 5.0 5.6 5.4 
Breadth of 2 nasals at distal 
Gill sogacedooussouneon 4.0 5.0 AR 2M |ieecyenvers CH) ll woos 6.6 5.2 Bez 4.9 
Length of mandible 
(Giz) Sondogoceuges 95.2 98.0 228). ||erersrcvere 93.1 94.8 95.4 94.4 QB) | stearerere 
Length of mandible 
(HAE) Soucosooscsecd|| conan llennood Joovece ||lmecoce 98.6 HOME | booed 103.2 HOCH. | coonod 
Depth of mandible at mid- 
Ge areteres crcvelevvoreiesavy cies CON allio Aano Fate ill rectors 6.2 7.0 6.9 6.4 7) || oonods 
BALA{NOPTERA PHYSALUS (L.). EUROPEAN AND AMERICAN. SKULL. 
Measurement. ary aie Nairn, Scotland. 
MotalWlene theories) ae RG SEU Sea COC One cio g Send ee 100.0 % 100.0 % 
Greatestapread th prey wie eeciceit ein me eto ierrcrsietianse (3)° 47.1 45-8 
Breadthyororbital borderof frontal sa. s-e)- a6 s oeier ais 6 ol (3 10.6 10.7 
Reno thyoty beakers rerio raisic nus oie? sivcsenucreretcien She SOS Oe (3 67.2 66.2 
Breevahiin. ot Waals aye wae y oat aowocdacosacoaoucneadebLooobS (3) 19.6 18.6 
ILGAGTINO}T SIG candies aagoe aon Ose eouc no ad bo Soncormoor (4) ol 5.2 
BeaGkin OF WEGEIS 6 Anennecden cgemTines mo veoo SAcdodeoms imam ad (4) Bag 5-9 
Wengthotmancdiblemmystraroiit MM ety etre tette eerie lel) (3) 93-9 93-1 
Depth of mandible at the middle........... SE Eee Skee s (2) 6.7 | 6.2 
The agreement shown in the foregoing measurements is very close except in the 
case of the breadth across the squamosals. In regard to this measurement, it must 
be said that in all specimens of the several species of Balenoptera it exhibits a 
considerable range of variation, indicative in part of a real individual variation of 
considerable extent, and in part, no doubt, to changes in the skulls in drying. 
17.5 in. added for premaxille. 4 Least = 5.5% TTLeast = 7.2%. 
® Squamosals peculiarly broad. See Flower. cree 2 ee 5 To post. curved margin of maxilla. 
3 Least = 6.9 %. See — Ag ® Number of specimens ; the California 
skull is not included. 
