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Show 164 DB. ST. GEOEGE MIVABT ON THE [Mar. 5, extends for a considerable distance forwards and for about half as great a distance backwards, each pair of prolongations slightly diverging as they proceed. The ends of the anterior prolongations are united by cartilage, between which, the isthmus of bone before mentioned, and the two anterior limbs of the entoglossals a vacant space is included which is longer than broad. The dorsal surface Fig. 1. C Hyoid of Psittacus erithacus, \. A. Dorsal aspect; B. Ventral aspect; C. Lateral aspect. Explanation of the lettering. b, basihyal. e, entoglossum. c, concavity or cup-like excavation. p, parahyal process (see figs. 1 & 6). parahyal arch (see figs. 2, 3, 4, & 5). u, urohyal. hb, hypobranchial. cb, ceratobranchial. h, symphysis of crura of parahyal arch. |