. Bulletin of the Natural History Museum Zoology. Fig. 27 Antiguraleus morganus (Barnard, 1958). Semidiagrammatic longitudinal section of the foregut (salivary glands not to scale).. Fig. 28 Radulae of Crassispirinae. a, Antiguraleus morganus b, Paraguraleus costatus. Scale bars = 20um. Buccal mass and oesophagus The long, buccal mass lies posterior to the proboscis, and is equiva- lent to nearly half of the proboscis length, with thick walls and a rather broad inner cavity, which is not curved. There are large extensible buccal lips. The oesophagus is not elongated between buccal mass and ner
. Bulletin of the Natural History Museum Zoology. Fig. 27 Antiguraleus morganus (Barnard, 1958). Semidiagrammatic longitudinal section of the foregut (salivary glands not to scale).. Fig. 28 Radulae of Crassispirinae. a, Antiguraleus morganus b, Paraguraleus costatus. Scale bars = 20um. Buccal mass and oesophagus The long, buccal mass lies posterior to the proboscis, and is equiva- lent to nearly half of the proboscis length, with thick walls and a rather broad inner cavity, which is not curved. There are large extensible buccal lips. The oesophagus is not elongated between buccal mass and nerve ring, which is situated closely posterior to the buccal mass. A buccal sac is absent. Glands The salivary glands are large, paired, and consist of single, coiled tubes but with the acinous morphology. The venom gland does not change histology after passing anteriorly through the nerve ring. It opens at the border between the buccal mass and oesophagus just in front of the nerve ring. The muscular bulb is small, the wall formed of two equal layers of longitudinal fibres, divided by a connective tissue layer, with an innermost very thin layer of circular muscle. Odontophore and radula The odontophore is medium-sized, with a pair of unfused cartilages formed of one layer of cells. The radula consists of marginal teeth of the wishbone type (Fig. 28a). The major limb of the tooth is elongate with a pointed tip and a constricted waist in the middle of the tooth. Below this constriction, the lower marginal edge of the tooth is extended as a 'soft' buttress to attach to the radular membrane. The minor element is slender and shorter, attached to the distal blade of the major element and broadens slightly at the base, where it attaches to the membrane. The marginal teeth are long, ca. 120pm (, AL).. 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 m
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