28 ELEMENTS OF MAMMALIAN ANATOMY. 



of tlie sense of smell is proportional to the development of 

 the ethmoturbinals. In most orders of animals five scrolls 

 are present, but in Echidna there are six and in some Ungu- 

 lates there are eight, while in adult Primates there are only 

 from one to three, more, however, being present in the 

 embryo. 



The mesethmoid is the perpendicular plate of bone which, 

 prolonged craniad by cartilage, separates the nasal cavity 

 into two portions. Caudad it is united to the cribriform 



FIG. 16. DORSAL ASPECT OF THE CAT'S SKULL. 



ap, Anterior palatine foramen; c, canine tooth; co, coronal suture; /, 

 foramina in palatine bone, the lateral one is the posterior palatine 

 and the medial one is the sphenopalatine ; fr,. frontal ; if, inf raorbital 

 foramen ; in, interparietal ; Ic, lachrymal canal at the medial border 

 of the lachrymal bone ; Id, lambdoidal crest ; ml, malar ; mx, maxil- 

 lary; na, nasal; oc, occipital; p, vertical plate of the palatine; po, 

 postorbital process of the frontal; pm, postorbital process of the 

 malar; par, parietal; px, premaxillary; sq, squamosal part of the 

 temporal; sg, sagittal suture; j/>, alisphenoid part of the sphenoid; 

 tp, temporal fossa ; sg, zygomatic process of the squamosal. 



plate, dorsally it articulates with the median descending 

 plates of the frontals and the nasals, and ventrally it articu- 



