NO. 5 TELESCOPING OF THE CETACEAN SKULL 55 



EXPLANATION OF PLATES 



In order to eliminate so far as possible the confusing influence of the great 

 differences in size presented by the skulls of such animals as foxes, porpoises 

 and baleen whales, most of the specimens have been photographed at a length 

 of about 7-8 inches and then reduced to the dimensions required by the plates. 

 Any attempt to indicate the scales of the various reductions would be contrary 

 to the strictly morphological purposes of the illustrations. 



The following abbreviations are used : 



a. o. for. =: Antorbital foramen. 



a. pr. = Ascending process of maxillary, 

 a. sph. =: Alisphenoid. 

 eth. = Ethmoid. 

 fr. = Frontal, 

 i. =: Intermaxillary. 

 i. p. = Interparietal. 

 j.= Jugal. 

 1. = Lacrimal, 

 mes. = Mesethmoid. 

 mx. =: Maxillary. 



n. ^ Nasal. 

 occ. = Occipital. 



o. pi. = Otbital plate of maxillary, 

 orb. = Orbit, 

 o. s. = Occipital shield, 

 o. sph. =: Orbitosphenoid. 

 p. = Palatine, 

 par. = Parietal, 

 pt. = Pterygoid. 

 sq. = Squamosal. 

 V. ^= Vomer. 



X. ^ Postero-internal angle of orbital plate of maxillary. 

 y. = Posterior termination of maxillary in median line. 

 + =: Position of anterior margin of occipital shield. 

 t = Position of narial orifice. 



