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Show 136 MR. W. P. PYCRAFT ON THE OSTEOLOGY [Feb. 20, The interorbital region is narrow, except in Homorus and Xiphocolaptes, where it may almost be described as broad. In all cases this region expands above and behind the antorbital plates to form a protecting roof for the front of the orbit. Lachrymals, even when present, contribute nothing towards the formation of this protection (see p. 138). Text-fig. 49. p.O.fO. ^.Z.S. Lateral aspect of the skulls of:-a. Pseudoeolaptes boissineauti. b. Hylactes megapodius. c. Batara cinereus. d. JJendrocolaptes picumnus. a.n. = anterior nares. a.o.p. = antorbital process, c.p. = cerebellar prominence. i.o.s. = interorbital septum. n.a. = anterior nares. pa. = palatal, p.o.p. - posterior orbital process, pt. = pterygoid, p.z.s. = processus zygomaticus squamosi. The frontals pass insensibly forwards into the nasals, except in |