310 On the Osteology of the Head of Hatterisi. 



the contrary, only one tooth, but the spot where a second was 

 situated can still be distinctly seen. The teeth are fairly 

 long, with conical points, covered with enamel, and with the 

 tips of a dark colour and curved inwards. The dark colour 

 of their tips, apart from the considerable length of the teeth 

 themselves, allows us to conclude that they had broken 

 through the mucous membrane of the palate and projected 

 into the cavity of tiie mouth. 



]t is certainly very remarkable that relatively few speci- 

 mens possess the vomerine teeth. Baur (/oc. cit.) has ex- 

 pressed the conjecture that they only exist in young specimens 

 and disappear in old age. Howes, however, has observed 

 the vomerine teeth in an old specimen — " in a senile old 

 male " — and, further, found that all the four individuals which 

 possessed these teeth were demonstrably males. This last 

 observation appears not to be without interest, and there is 

 perhaps more probability in the idea that only the males 

 possess the vomerine teeth than in Baur's conjecture that 

 they ai-e only present during youth. In two of the specimens 

 which I examined I found no trace of teeth upon the vomer, 

 although, to judge by their size and the separation of all 

 their cranial bones, they were still fairly young, while 

 another, adult, individual possessed the vomerine teeth in the 

 manner already stated. Unfortunately I was unable to deter- 

 mine the sex of this specimen, since the internal organs were 

 missing. 



EXPLANATION OF PLATE XIY. 



Fiff. 1 . Vomer from below. 



T-iV/. 2. Interorbital Beptum ami anterior cranial Avail. 



Fiff. ii. Bonv cranium from behind, wilh the omist?iun of the right jiar- 



occipital. 



Fiff. 4. Supraoccipital from below. 



Fi(/. 5. lligbt paroccipital from in front and within. 



Fi(/. (3. Basi8])beuoid from in front. 



Fiff. 7. Basisphenoid from above. 



Fig. 8. Basispbenoid from below. 



Fig. 0. l^asioecipital from above. 



Fig. 10. Otospbenoid from tlie inside. 



Fig. IL Parietals from above. 



E.iphmatiott of the Litters. 



a.o. Ala otospbenoidea. c.oc. Condvlus ixcipitalis. 



(I.e. Aqiuvductus vestibuli. cs.o. Cri.>ita supraifcipitnli?. 



h.o. liasioccipital. d.d. Bentes dextri. 



t).it. Basispbenoid.. t/.e. Dorsum epliippii. 



(•.Columella. */..<. IKmis sinister. 



cms. Commissure. /". FrouUd. 



CO. Canalja olfactorius. f.c. Fossu cochletuis. 



