. Bulletin of the British Museum (Natural History). ACANTHOCEPHALAN FROM A BIRD 457 and surrounded by a strengthening basal-plate on the surface of the proboscis (fig. 2, b and c). The spines form 26-30 longitudinal rows of 2-3 each and their length from base to tip varies between 0-014-0-033 mm. There is a fairly rapid gradation in the size and the shape of the spines, those in the anterior rows being similar in shape to a bill-hook, but more slender, and the form of the posterior spines being almost mere pointed stumps. The proboscis-sheath is sac-Hke, but divided into two parts; the anterio
. Bulletin of the British Museum (Natural History). ACANTHOCEPHALAN FROM A BIRD 457 and surrounded by a strengthening basal-plate on the surface of the proboscis (fig. 2, b and c). The spines form 26-30 longitudinal rows of 2-3 each and their length from base to tip varies between 0-014-0-033 mm. There is a fairly rapid gradation in the size and the shape of the spines, those in the anterior rows being similar in shape to a bill-hook, but more slender, and the form of the posterior spines being almost mere pointed stumps. The proboscis-sheath is sac-Hke, but divided into two parts; the anterior portion consisting of a thin, inner layer of longitudinal muscle and a thick outer wall of circular muscle, while the posterior portion has no such outer wall (fig. i). The entire sheath measures 0-64-1-8 mm in length and 0-11-0-35 mm at its widest point. The nerve-gangHon lies very near to the centre of the sheath. The lemnisci are I I. 1mm Fig. 3. The male reproductive system of Mediorhynchus selengensis. a, cement glands; b, Saefitigen's pouch; c, penis papilla; d, bursa. C«. 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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Keywords: ., 1973, boo, bookauthorbritishmuseumnaturalhistory, bookcentury1900
