10 



and possibly Hyaznodon form part of the lost series which terminated in 

 the Seals of the present. 



SYNOPLOTHEBJTJM LANIUS. Cope. 

 Proceed. Ame,r. Phitos. Soc., 1872, p. 483. 



The cranium of this species is rather less than that of the grizzly 

 bear, while the other bones do not indicate so large an animal. 



Measurements. 



M. 



Length glenoid cavity 0.045 



Width " " 025 



Diameter zygomatic fossa * .058 



Width opisthotic inside for. stylohyoideum 014 



Diameter meatus auditorius externus 012 



cavum tympani 009 



Length ramus mandibuli preserved 228 



" of series of seven molar teeth 131 



lf last molar, crown 0155 



Width " " 0080 



Length of penultimate " 0215 



Width " " 0100 



Length exposed part of inferior canine 024 



" " superior " 032 



" " outer upper incisor 023 



Piameter triturating surface inferior canine 028 



" do., transverse 0166 



" superior canine (antero-posterior) 024 



" of the two inner incisors 010 



" of exterior incisor (oblique) 010 



" symphysis mandibuli 044 



" nareal orifice 040 



Depth " " 031 



" mandibular ramus at M. 6 049 



Thickness below of do 014 



Length of a superior molar crown 020 



Diameter condyle of humerus 047 



" shaft " (compressed) 0410 



" condyles " 0415 



" " " (antero-posterior) 032 



" head radius (transverse) 0282 



" " (vertical) 0162 



" shaft radius 016 



" cotylus of ulna (long) 030 



Depth ulna at coronoid process 034 



Length carpus and digit 2 without unguis 112 



" two phalanges do 037 



" metacarpal do 061 



