166 



DR. ST, GEOEGE MITAET ON THE 



[Mar.5 



has on its summit a cup-like excavation (c), which is an exagge- 

 ration of the slight depression which exists there in P. enthaeus. 

 The median dorsal ridge is very marked where it traverses the 

 posterior, enlarged, part of the hjoid, and there is a marked con- 

 cavity on either side of it as each outer margin of the ex[)auded 

 part of the basihyal is somewhat elevated. These raised margins 

 are continued on into a very long and very delicate ossicle on either 



Kg. 2. 



-c C 



Hyoid of Lorius domicella, \. 



A, Dorsal aspect ; B. Ventral aspect ; C. Lateral aspect. 

 (Lettering as before, see j). 164.) 



side, which seems to represent the parahyal process of P. erithacus. 

 If so, these very long and extremely delicate parahyal processes 

 pass forwards, curving gently mesiad till they meet in a symphysis 

 which is placed above and but little behind the dorsal cup before 

 mentioned. Thus these processes form a parahyal arch {p\ which 

 has a singular resemblance to an " os furculum," the symphysis 



