92 



ESCHRICHT A'ND REINHARDT 



corresponding figure in Plate IV. Tlie letters b, g, m, p, t, f, u, v, and g, have here the same 

 signification as in the plate ; nf is the exterior and largest of those prolongations into which the 

 visible portion of the palatine surface of the superior maxillary is divided behind ; m the 

 orbital process of the superior maxillary, o' the basal part of the occipital, ic that part of the 

 pterygoid which immediately joins the parietal, u that part of the pterygoid which joins the 

 occipital, v the most posterior part of the vomer. 



It will be seen that here in the newborn individual a very considerable portion, com- 

 posed of bones belonging more or less to the cranium, is still placed behind the free edge of the 

 pterygoids (m), contrary to what is the case in the full-grown specimen. More especially, we 

 still see here in the middle line that part of the vomer which covers the posterior sphenoid 

 as well as the entire basilar part of the occipital (pars hasilaris ossis occipitis, o"), of comparatively 

 large dimensions, while in the full-grown individual these parts can scarcely be distinguished 

 in their covered position between the inner edge of the palatines. Immediately to the outer side 

 of this plate of the vomer the middle portions of the pterygoids occupy in the newborn individual 

 a very extensive tract {ii) ; behind their palatine portions and outside and behind the basilar part 

 of the occipital (o") a great part of the condyles [k) of this bone are still to be seen, which in the 

 full-grown individual have been pressed upwards on to the superior surface. A little further 

 outwards the tympanic [g], loosely joined with the petrous bone, is shown on one side ; in the 

 newborn animal it is large and round, in the full-grown one comparatively much smaller, and, 

 at the same time, rather differently formed. Also the lateral portions of the articular parts of the 

 occipital are still in the newborn specimen (o) very prominent on the lower surface of the 

 cranium, while in the full-grown one, they have almost totally disappeared. 



A very different relation will be perceived between the cranium of the newborn animal 

 and that of the full-grown one, as to the lateral portions of the temporals, in conformity 

 with what has already been stated to take place in them during their growth. In this, as 



