On the Cartilago palatina and the Organ of Jacobson in some Mammals. 349 



Tupajidae. 



I have examiued different stages of foetal specimens of Tupaja 

 javanica and a foetal individual of an other larger species, Tupaja sp. 

 from Borneo. The two species exarained agree completely as to the 

 cartilaginous parts. 



The cartilages which form the nasal floor are connected with 

 the nasal septum only in its foremost part. Further back the con- 

 nection is lost, but they lie close to the septum. Laterally they 



Fi?:. 7. 



Fig. 8. 



o.b v c ps 

 i i i 



f.d-A 



vT» _~ 



j.o: 

 c.p. 



c.ps 



pmx 



pmx. 7 \ ^ 



-pmx 



cp. 



Tupaja sp. Foetus (44 mm). Transverse s ections of region of Jacobsons organ. a.n. alinasal cartilage; 

 cp. cartilago palatina; c.ps. cartilago paraseptalis; J.o. Jacobson's organ; l.d. lachrymal duct; 

 «.8. nasal septum; o.b. outer bar of cartilago paraseptalis; pmx. premaxillary ; v. blood-vessel. xc. 4S. 



are connected with the alinasal cartilages. In front of the naso- 

 palatine canals they lose the connection with the cartilages on the 

 outer sides and continue backwards as the cartilagines paraseptales 

 (Fig. 5). 



Fig. 6 shows how the upper end of the cartilago paraseptalis 

 is beginning to widen; at the same time its lower end Stretches down 

 on the inner side of the naso-palatine canal. 



In this figure another cartilage — cartilago palatina. — appears 

 represented by a small cartilaginous plate situated on the outer side 



