30 



DINOCEKATA. 



In the skull of Tinoceras ingens (number 1041), the palate is only 

 slightly excavated in its anterior part, and the palato-maxillary foi'amina 

 are brought forward in front of the entire series of molar teeth, instead of 

 being situated nearly opposite the second premolar. The palate between 

 tlie whole series of molar teeth is nearly flat. The foramen in the maxillo- 

 jialatine suture liehind the last molar is largd and conspicuous, especially 

 on the left side. Tliese foramina are shown in figure 28, page 27. 



I'lu. 32. Fig. ;-;3. 



^-P\ 





ill! 



KiiiURE 32. — Horizontal Sfction of skull of Tinoceras Mans, Marsh (No. 1499). 



Figure 33. — Horizontal sci^lioii cf skull of Dinoceras laticeps. Marsh (No. 1202), female. 



.;. cavity behind base of caniae too:h; 6. brain-cavity; c. alveole of canine tooth ; / anterior olfactory 

 chamber; /'. posterior olfactory chamber; ?u'. maxillary protuberance; n. nasal bones; »'. nasal 

 protuberances ; j/. parietal protuberances. 



Both figures are one-eighth natural size. 



In the type of Thioceras grmtde (number 1040), the maxillo-palatine 

 foramen is behind tlie beginning of the molar series, and the excavation of 

 the 2>alatal region also extends behind the first premolars. 



