. Bulletin of the British Museum (Natural History). 26 p. H. GREENWOOD A moderately developed rectus communis extends between the fourth ccrato- branchial and the proximal end ot the ventral process from the second hypobranchial. The muscle is closely applied to, but distinct from, the dorsal margin of the sterno- hyoideus. A short, broad and nearly triangular muscle joins the fourth and fifth ceratobranchials near their proximal ends. I cannot be certain about the identity of this muscle It could be a displaced obliquus of the fourth arch or, more likely, part of this obliquus since there is
. Bulletin of the British Museum (Natural History). 26 p. H. GREENWOOD A moderately developed rectus communis extends between the fourth ccrato- branchial and the proximal end ot the ventral process from the second hypobranchial. The muscle is closely applied to, but distinct from, the dorsal margin of the sterno- hyoideus. A short, broad and nearly triangular muscle joins the fourth and fifth ceratobranchials near their proximal ends. I cannot be certain about the identity of this muscle It could be a displaced obliquus of the fourth arch or, more likely, part of this obliquus since there is a large transversus associated with the arch (all this assuming that obliqui are, primitively, associated with each arch; see Nelson, 1967). The anterior transversus is moderately broad; it links the ventral tips of the fourth ceratobranchials. The posterior transversus runs obliquely forward so that it has the shape of a V, the apex inserting on the cartilaginous block lying between the ventral tips of the third and fourth ceratobranchials (the fourth basibranchial of Nelson, 1968). The arms of the V are closely applied to the ventral surface of each cerato- branchial. Hbl Cbl Ob2 RC Ob3. Fig. 11. Mormyrus Itannume: ventral gill arch muscles and sternohyoideus in left lateral view. Not all the connective tissue surrounding the basihyal and urohyal has been dissected Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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