THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 197 
BALASNOPTERA ACUTO-ROSTRATA LAC. EUROPEAN AND AMERICAN. SKULL. 
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vr ao . 
-o m a 3 é 
Peace d| ac |e S % eee) Ls 
aeglee |S2 |/2 |e is |.d. as PSH CR [ees 
O35 -|52 | 72 g = = aS a d Siz ah aries See ne 
ores Bert See 77) a 2 See ae aa £5 494 BAe BY 
pobl|Sce|) Sool gs 9 5 6-2 7] .26| Bui | 2%o| Fau Sui | Sui 
eSe\éceleeel2 |2 |e |2e8/Es2| S5 [S28] S25 | 85 |E5 
i OReR Od) 805 | 4 5 iS) pilot roy| tee eee [Tesi eae Weare elo 
Alt ies Mec || a A (8 |Setlsaal fs (2a! S28] se8| es 
Seglsee| SES | Sos] Soc liec| Saal Seh| SS i(sas| STE] bas] ge 
654/<58| a5& | aaa | Aaa [dag |mps|SaS| BS 1858) G58 | E28 155 
Sexiandlage ci sacies iio tclses=5 Q jr. | Jr. | $ jr. g &? |9 ad. jr. ad. |9ad.° | ad.® 
Total length of whale............ oy use 18" 18’ | 30'+ |28' 4" 
Total length of skeleton.......... 23/0" 
I 
Length of skull (condylo-premax- - : r i B 7 é 
Wer” Simtelinceaopacas osaor 32" | 40" | 445"1) 46") | 713"1') 70" 1625") 49> | 433" | 48” | 61.257) 61.5" | 60.5" 
% % % & % % % % & % % 
Wenpthyot beaks. ence «os cicis' 62.5] 62.5) 60.7 | 60.0 | 67.3 | 67.8] 65.2/62.07) 61.5] 62.5 | 62.01] 61.8 | 60.8 
ee) es maxilla Ave se acerca 67.2| 69.4] 68.0 | 70.1 2G? |) TBA eos) pyoae Phe Kelsee hl Lag cal poogoelbooor 
“ Se premaxillat irra G4 Gor iie7ina su 72-84 7a B76 eai|- a |oe. 3 os Eos coe 75.9'| 73.6 | 75.2 
From ant. border foramen mag. 
over vertex to tip of beak.......]..... LO2-5i||LO3-2)| TO3.24|/ T0520! O60; Alla. = ella aae « TOA. O)i0 oe 102.1'/104.1 |104.1 
Ditto to upper border of occiput...|..... CAHN) Wlstane || Ct bac Hl | Cloar IAP karl oe oalna ae ZG inS\ Talsters 25.3 | 27.6 | 28.1 
Greatest breadth of skull......... OPO] cet 51.7 | 50.0! 54.6 | 55.4| 56.6]..... Bib atl Mranerere Efe. | taopest it Gizpae3 
Breadth at base of beak.......... 31.3] 31.9) 32.6 | 30.5 | 33.9 | 32.9] 33.6] 31.8] 32.2] 34.4%] 32.7 | 35.0 | 33.9 
ie “* middle of beak........ 21.9] 25.6] 22.5] 21.8 | 23.1 | 24.3] 21.2] 20.4] 19.8] 18.84] 17.9 | 20.7 | 20.7 
Se « «* _ “ orbital borders 
OffrontalSs ac cyeie/c/oc bs slo sivs eee 46.9] 45-0] 44.0] 45.6] 50.7] 51.0]..... 44.9] 44.3]..... 50.0 | 53.3 | 52.1 
Greatest breadth of maxilla behind 
IMASG Of DEAK ox cic-n/cu a sercrp sieve: AG 3 buco AsO cere AQ) I7) |e l)G3\Hocoplboooa G5 Ol eee ASn2) numer: 50.4 
Greatest breadth between outer bor- 
ders of both premaxillz........ Cher ell| ELON UIA! WHC) || Tele eA cooalbooe o TEs versie 13.4 | 15.4 | 13.6 
Greatest breadth between inner bor- 
ders of both premaxille........ 7.8| 10.0] 10.1 Sere] SORE | Moko AA Asal hones Vb ogec g-8] 10.6] 9.1 
Height from vertex to pterygoids..|..... PEO] HFN) Pyleyp |) else") COO bGsonihencalbobocl|bor ‘oo\bbooo0|poomad|booon 
Length of mandible (straight)... .. 93-8] 99-4] 96.6 | 98.9 | 100.7 |I0r.4].....]..... CVT CVE) |booaaa|booo0s 100.0 
oe ae + along outer 
Gtrfacete wreretreteleirerstais eleveraleveicneye g98.4|103.7) 103.4 | 106.5 | 108.0 |109.3|105.0}..... BOD RAN hoteics| rors raleiel lateieveters 109.0 
Height of mandible at condyle....| 10.2] 8.7] 10.7 hae} || nay | sei Sea celboode C6) Gavalboaanollocoodlbooas 
a bi me OO Color gay aVorts la en) See] OES) ab dee |) IGN Gey | teal aaa boogc WPAN REA | baosaslboocdos 13.1 
= ss Les “* symphysis..} 5.5] 5-6] 5.1 4.3 ROM S54 | rereresal lopneibie oy /loroecil he apa pooccal etee 
It will be found by examination of the foregoing table that the dimensions of 
the Massachusetts skull shows a surprisingly close approximation to those of the 
Scotch skulls of the same size, amounting indeed to identity. The few points of 
disagreement are probably due to differences in the relative positions of the several 
bones of the skull arising from shrinkage in drying, etc. These are as follows: (1) 
A very slight excess in the length of the skull measured over the occipital bone, 
1 2" added for breakage. 
? Swedish. In straight line. 
3 From Zodl, Erebus and Terror, p. 50; 2.4" added for premaxille. In P. Z. S., 1864, p. 399, Flower mentions 
two skulls in R. Coll. Surg., as follows: Adolescent; length, 65"; breadth, 54%; breadth of beak at middle, 23%. The 
2d is young. Length, 48"; breadth, 50%; breadth of beak at middle, 20%. Also an adolescent skull at Brussels. 
Length, 63"; breadth, 54%; breadth of beak at middle, 21%. 
4 Curved. 
* The measurements of these three specimens were taken by me at the same time by the same method in straight 
lines, with calipers, and are strictly comparable. 
