294 THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 
In. and 1ooths. 
Breadth) of beakjat} itsdenpthytrom) base (curved) setae reece ere ereceetee 6.00 
Breadth of maxillary at $ its length from base (curved)............-2.2-++eeeeece- 1.50 
Breadth of premaxillary at $ its length from base (curved)...........-...+-+2: 1.25 
Lengthyoflower jaw ingaystrale tlie). .-y-(r)- = st-)eielo selene sie eer eee 47.00 
Fleight at Coromord proGessvar, siay-is\sjsyo.c sic s.)-0/a/o\elors aia) stews open ace caepeemeats Sierra ee 6.00 
Length from posterior end of condyle to coronoid process...........+++.2-.se-0+: 7.50 
Heightof framusyatsmid dle ave clos taalsjare « Save tisvers a araltels tise jeretee aievore tener e oreecrstere aC 4.00 
AMOUNEOF CURVE 3 eich sic cie oid sho h ae one ccd earesiete ele Saeed akersvarcts ciel ae Sloe clarke Cree 6.50 
Rengthiof (otic, bulllacie. 2 sissy) els. focroe  sicieceptsiotsl cits selector eka Me seas ek met ls erect 3-50 
The osteological material of this species in the National Museum available for 
the study consists of (1) a skull from Puget Sound (Cat. No. 12177, U.S. N. ML), 
presented by Capt. C. M. Scammon about 1872, and very probably belonging to 
the individual from which the original description was drawn, and hence the type 
of the species ; (2) askull from St. Paul Id., Pribilof Group, Alaska (Cat. No. 61715, 
U.S. N. M.), collected by Mr. C. H. Townsend of the U. S. Fish Commission. 
Measurements of these skulls, reduced to percentages of the total length, are 
given on page 197, with those of specimens of 2. acuto-rostrata. It will be observed 
by reference to the measurements that the Pacific specimens agree in all but one or 
two of the proportions given with those from the Atlantic in the closest possible 
manner. In each proportion in which one of the Pacific skulls differs from the 
Atlantic ones, the other harmonizes with the latter, so that there cannot be said to 
be a constant difference in any of the proportions between the specimens from the 
two oceans. For convenience, the actual measurements of the two Pacific skulls, 
and of the Norway skull, No. 13877, are given below : 
BALAZHNOPTERA ACUTO-ROSTRATA LAC. AND B, DAVIDSONI SCAMMON. SKULL. 
= as = 
. AST 3} iS 
Soe iN ea Saale 
Measurement. ! ale sew “24 
Se aes 
Py Se eae 
isa) apy = 
H ae to) 
in in. in. 
Wengthiof skulll(condylo-premaxillary)\inses ses eee ee eee 60.5 Gres |) S25 
re STO ake ra dye ate obs, aha) he cer sae eterere a edn, Sa idtc San mare eee in 36.75 | 38.0 | 36.07 
Ss 5 ANN ACA Ech sce craven SPORE Re 7 Oh wcahctas a ee AU ToL ave te Laeat va coe aE ee 
a So Premaxilla sees s-yapaePe ere ic aac ower ee amen 45.5 45.25 Annie 
Ant. border foramen margin over vertex to tip of beak.............. 63.0 64.0 | 60.57 
Dittowo uppem border ofsocel pulse mney ini tare eee niente 17.0 17.0 16.0 
Greatestbreadthiof skull vac srtstecrterite tite oio-8 ctor a emer eenaarate 34.5 Oy || Bias 
Breadthtat) baserofabeaksrja.7e/ssiaeiiem ities c-/i- aeeeee eee ieeiietee 20.5 21.5 20.0 
ay Suerte GUL) a Yom anem ca chine eLeMMPerarY Nido. AaBiiic abwhicace 12.5 WY | Hie) 
S Ske = orbital boxderotetrontalsss-4 sereneenene eee 31.5 32.75 | 30.5 
Greatest breadth of maxilla behind base of beak................... BOI! jl) ceysiatie 29.5 
my “between outer borders of both premaxille.......... 8.25 9-5 8.25 
iS oe <j ainer is ae SY koeeita cee 5-5 6.5 6.0 
From vomer at ant. end of palate through to vertex................. 13.75 15.5 14.75 
Inner margin nasal processes of max. to end of orbital process of max.. rus 19.25 | 17.75 
Outer edge of premaxilla to end of orbital process of maxilla........ 16.0 16,0 15.5 
* All straight, unless otherwise stated. * Add 2 in. for breakage. 
