THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIO. 293 
Scammon’s measurements of B. davidsoni, show a very close agreement with those 
of Sir Wim. Turner’s specimen from Granton, Scotland, except in the position of the dor- 
sal fin. In Scammon’s specimen the distance from the tip of the snout to the posterior 
margin of the dorsal fin is 66.6 % of the total length, while in the Granton specimen it 
is 70%, and in other European specimens, from 71% to 74%. This difference would 
be of importance if substantiated, but a study of Scammon’s measurements shows 
that it is due to an error. He states that the genital opening is slightly behind the 
anterior edge of the dorsal fin. We may presume, therefore, that the latter is about 
6 in. in advance of the former, which is 9 ft. 6 in. from the notch of the flukes, or 17 
ft. 6 in. from the tip of the snout. The anterior edge of the dorsal fin is, therefore, 
17 feet from the tip of the snout, and as its base is 2 ft. 4 in. long, the posterior edge 
would be 19 ft. 4 in. from the tip of the snout, which is 71.6 % of the total length. 
That this calculation is substantially correct is shown by the fact that in the 
foetus from the same specimen, the measurements of which are given by Scammon, 
the distance of the posterior margin of the dorsal from the tip of the snout is 71.2 % 
of the total length. The dorsal fin in . davidsoni, is, therefore, situated as in 
B. acuto-rostrata. 
Mr. W. H. Dall, in the appendix to the Marine Mammals (82, 304, 805) gave the 
following measurements of a skull of unknown locality, presented to the museum of 
the California Academy of Sciences, by Mr. Merrill: 
BALAZNOPTERA DAVIDSONI SCAMMON. SKULL. 
In. and rooths. 
Lomein OF Sulla Soeaneie Ito. 6 sncucocovobusocy0 Topo MOGOD 4 doO5GGe oo0KoUDe OOS 48.00 
Binseialiln Gn Comabylesis ooGoaas dave nDoDUbDeoUcoEs OS COORD CO OUEOUOoOUOGHoCO bs Gor 4.50? 
Breadthoflex-oceipitals) (forouter edge Of SUtUTE)/aaeiie ene see oe eeleleselclelieiceisielsie- 17.00 
BincaGlida Ot SoMAN@SAISS 55004 c6o0don6o noNndoOdO OOo COOUBONH EO COON NOON UDOGADNEDS 27.00 
TBIGIEL: OH TOEIINE METAS ooo open o DoD ooRoDoo00 soon dao pop oGdo noon Dood oGaoK0D 2.00 
IL@aeIn OH Hopeless onc oc0o0 coos caccss oop cou coeu cuoU UnN0bo0gnn AU0G5000 13.00 
Length of articular process of squamosal, antero-posterior............++.2+0 e000 8.00 
Wength of orbitali process of frontal, right top lefitirer writes iel-lvie) seein orale ot) slocel« ole 10,00 
Breadth of orbital from curved border of maxillary to hinder edge of orbital process of 
Firs ra tical eters peers eyetaysvalcte syare/oiekacoyey oi cla c¥areneveve;cebelare) sist sia'aiais Siccelel veve/aleierersjejietore akejnieie ete g.00 
BreadthrosonpitaleatppemSurtace On (OMtemenGererpetetelatel-tneleielaclere chelates elle elles =) cle 6.50 
Nagas, Ienailn oop aosegeuesacosous obec ongu 5 seo ob sooo gasoemopeD sod adgooou Ud odK 4.50 
Nasalsw read thvotyth eitworat postenlory ene cry rtscter-tevatalsyeataletotere ete) eretsisiel = alels)=) =) -Nel=i< 1.00 
NaSAIS, DRAGAN OF TNS Ko le Eiakieraow GUVs onsoo econ aceo onbOebenonoosDonocdcadad 2.50 
Length from curved border of maxillary to tip of beak.. ..........-...2-0-----0e- 30.00 
LANE Oi MATIN. bo conn odd Dood Sood HOOoUsQo ODDO DANN EES DODoMDobOd pp OuE Soe 33.00 
Projection of premaxillary beyond maxillary..................0---0+-- ees +e eee 1.50 
BREACKIn Onr TASTE MMeS he vheGleir CANCl wang modo og ns soas dnonAoOL Oddo HUKEOnooenndO GOS 6.00 
Bneadthro tem asa anessacnossronbitalapKoceSsesamettaltteterartcl-l ect loie(olaleleleieiesteictokeret salt 12.50 
Breadthmotebeaksatibasen (Gtumved)\mrereritremrn tetrtasite tate) et layers atolenoielelsna Ueyeiele 16.50 
Breadthotbeakeats its length trom) bases (Curved) = ej --<1-)- fer oe so ele eecinie el) < = 12.00 
*Breadth of maxillary at } its length from base (curved)................0-eesse eens 2.50 
Breadthlon premaxillany at same) pot (Cumved)seyepiets i). <lcle1-t- (ce ticles etek eeierels= 1.00 
iBreadthvon beaksatemid dies (Cunvied)paritt-re il rrleteerte <-2)-/-1e\-lle iste eleterelcl-rolsrare ar 9.00 
Breadthrotmmarallenysatamud dle (erimved)) pets -nettetertet teers clete«e(elelol ieiaielfetelel-y-ietebe=n-i- 2.50 
Breadthonpremeaxillanyaat emi dle (Grimved)) preterm eter ptteton tee lero ie te leleterl--lal set ele-y === 1.50 
