OCR Text |
Show 166 DE. ST. GEOBGE MIVAET ON THE [Mar.5 has on its summit a cup-like excavation (c), which is an exaggeration of the slight depression which exists there in P. erithacus. The median dorsal ridge is very marked where it traverses the posterior, enlarged, part of the hyoid, and there is a marked concavity on either side of it as each outer margin of the expanded part of the basihyal is somewhat elevated. These raised margins are continued on into a very long and very delicate ossicle on either Fig. 2. B A A. Dorsal aspect; B. Ventral aspect; C. Lateral aspect. (Lettering as before, see p. 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 |