594 PHILOSOPHICAL TRANSACTIONS. [aNNO 17 10. 



articulation of the os zygoraaticum with the os calvariae j k the orifice of the meatus audltorius j 

 1 one of the condyles of the occiput, which is articulated with the first vertebra j m tlie orifice of 

 the large oval hole in the os maxillae 5 n the fore grinder in the upper jaw; o the hind grinder, or 

 rather wedge for keeping the fore grinder fast; p the undulate lines in the lower surface of the teeth; 

 q the beginning of the tusks as they proceed from the os palati ; r their broken off extremities; s the 

 sinus in the bottom of the orbit of the eye for the nervus opticus. 



Fig. 13, represents the back part of the head; aa the two eminences at the upper part of the head 

 enlarged, whereby the sinus between them becomes narrower and deeper ; b the sinus between these 

 eminences shortned ; cc tlie two condyles which are received by the first vertebra j d the hole for the 

 spinal marrow; ee two protuberances above the meatus auditorius; f the orifice of the meatus audi- 

 torius; g a sinus whence the processus styloides arises, which is shown by itself; h the cartilage 

 whereby the processus styloides is articulated with the skull; i its longest and smallest part; k its 

 shortest and largest part; 1 the orifice for the hard portion; ram the hole for the jugular vein and par 

 vagumj nn the bony part of the aqueduct; 00 the extremity of the aqueduct where the fleshy part 

 begins ; pp the hole for the carotid artery ; qq the hole for the arteria durae matris, and 3d branch 

 of the 5th pair; r the middle of the base of the skull beneath the hole for the spinal marrow, where 

 the bone is somewhat raised; s a depression on the base of the skull before the choana begins j t the 

 choana, or passage between the root of the trunk and the mouth ; u a production of the vomer, or 

 septum, which divides the choana in two; x the articulation of the os zygomaticum with the os oc- 

 cipitalc; y the glenoid cavity for reception of the lower condylus of the lower jaw; z the sinus for 

 the globe of the eye; 1 the os zygomaticum; 2 the fore grinder on the right side; 3 the hind grinder 

 on the right side) 4 the hind teeth on the left side, which not grinding at all, only serve as a wedge; 

 5 the fore teeth on the left side, the back part of which does not grind ; 66 the lower surface of the 

 grinders, where their undulate lines appear; 7 7 part of the os maxillae, where it is articulated with 

 the OS zygomaticum; 8 8 the great oval hole in the os maxillae; d9 the back part of the os palati; 

 10 the interstice between the ossa palati on the back side; 1111 the tusks as they proceed fi"om the 

 OS palati; 12 12 the two broken off" extremities of the tusks. 



Fig. 14, represents the skull sawed transversely, so that its lower part with the base appear; aa the 

 outward table of the skull; bb the inner table; cc the laminae which pass between the two tables; 

 dd the cells formed by these laminae; ee the orifices for vessels which penetrate the laminae; f the 

 seat of the brain, represented at more length in fig. 3; gg the two condyles which are received by 

 the first vertebra; h the hole for the spinal marrow; i the os zygomaticum. 



Fig. 15, represents the upper part of the skull sawed transversely, with the cells running between 

 the two tables and laminae which cover the seat of the brain. 



Plate xiv, fig. 1, represents the outside of the upper part of the skull, sawed transversely; aa two 

 eminences on the top of the skull; b a sinus between these two eminences; c a long spine in the 

 bottom of the sinus. 



Fig. 2, represents the fore part of the lower jawj aa the two condyles; bb the two processes of 

 the corona, shortened by the opposite view; cc the fore grinders of the lower jaw; d the distance 

 between the two jaws for lodging the tongue; e the symphysis menti. 



Fig. 3, represents the back parts of the lower jaw; aa two condyles; bb two large orifices of a 

 cavity, into which the vessels for nourishing the teeth enter, and wherein are lodged the rudiments 

 of the teeth, as in pi, ix, fig. 1, cc the two fore grinders of the lower jaw ; dd the undulated lines in 

 their upper surface; e the distance between them for lodging the tongue; f the concave part of the 

 lower jaw. 



Fig. 4, represents one side of the lower jaw ; aa the two condyles; bb the two processes of the 

 corona; c a protuberant part of the lower jaw, where the rudiments of the teeth are lodged; d the 



