48 SMITHSONIAN MISCELLANEOUS COLLECTIONS [voL. 48 
distally than proximally. Dorsal surface of squamosal, between the 
wall of the cranium and the zygomatic process, concave antero- 
posteriorly throughout its whole extent. Hard palate abbreviated, 
the posterior margin concave. 
PONTOLEON MAGNUS new species 
Size much larger than that of the largest of existing eared-seals. 
Skull when complete probably about 50 cm. (or 20 inches) long. 
DIMENSIONS OF THE TYPE-SKULL OF Pontoleon magnus AND OF TWO ADULT 
SKULLS OF Eumetopias jubata. 
| Pontoleon Eumetopias jubata. 
Measurements. / tel Bering Id, St. Paul Id., 
| No. 3792. Kamchatka | | Alaska, 
| | No. 49720. | No. 49730. 
| cm. { cm. cm. 
Total length (basi-cranial)...........c.06 cssesneeesesseeeenes | 40.1 36.5 
Total height posteriorly (from line of occipitomastoid 
processes to top of occipital crest in a straight line’... ig. E7cOn |, SeERe 
Greatest breadth between occipitomastoid processes... 24.81 De eee ge 5) 
Greatest breadth between outer margins of zygomatic | | 
PYOCESSES.OF SQUAMIOSAl,. isvoccedang-ed.cmrnetnatemeserineds 25.08: 1. 23.9 | 1s" sam 
Greatest breadth between outer margins of occipital 
EO IAA OER Se oss ancanGaapete nb SoHE ne caseuc, coueor danacassmane PLO. 9.0 8.6 
Height of occiput from upper margin of foramen mag- 
num to top of Geipiial crést.....0.00i. vie soes one toetaends | ‘eny2 grat 4 8.1 
Heishtiof foramen) macnn, .2..2..cssa.- seen yentons «es =ee | 5-7 Aiea 4.7 
Breadth of foramen Maelo me gososdanesoabonuonrey cesciscccc 4.1 BLOmne| Bon 
Beneth of anioccipitalscond yle-2-.. ssrsnrencorscse «use ee em / 8.1 6.2 6.4 
Breadthhof anvoccipital condyle. .-. << nssnedsecsaceneeasere Bai 3-4 ant 
Greatest transverse breadth of occipital crest.............. 15.4 15.8 13.8 
Breadth between occipital condyles inferiorly.......2..... 172 2.0 Dey, 
Greatest breadth of occipitomastoid process antero- “pos: | | | 
[ardtoy elk PAS aeNS tach accscnnaparradeease: door scocpepp oc saceaker| i Na 5-On a 52 
Distance from inferior margin of foramen magnum to. | | 
outer inferior angle of exoccipital.............02. ceeeeeee $26) 4) 8.2 7.8 
Distance from outer inferior angle of exoccipital to 
postglenoid process of squamosal........ ...2.scseeeeeeee 10.2 7.8 7:2 
Distance from inferior margin of foramen magnum to 
tip of hamular process of pterygoid...............0.se0e0 Ag © Es Ok ete 
Distance from tip of hamular process of pterygoid to | 
postevion ‘cmd of hat palates. asc <c: ans ccsse~soqued cerned 10.2 Nos | 5.1 
Distance from surface of occipital condyles to end of | | 
astral pioksibets 5 th, Sete 2 ean ait a8 dha eer ee 24.1 1H {ly ze 
Greatest breadth between outer walls of ascending’ | j 
plates of palatines at their posterior end................ 5:5) [aries || 5.6 
Greatest breadth of posterior nares..................--see00e Sake | 3.6 3.9 
Length of glenoid fossa of squamosal (transverse)...... For 7.5 (on 
Length of glenoid fossa of squamosal (antero-posterior). Aa s-| BRO 352 
* Actually 24.0 cm., but the left side is broken and 0.8 cm. has been added 
to agree with the right side. 
* Actually 23.0 cm., but the right side is broken. 
*The condyles are a little defective below. 
— ee 
a 
