. Bulletin of the Natural History Museum Zoology. Fig. 5 Uraeotyphlus cf. narayani (field tag MW 207). Views of (a) dorsal, and (b) distal and slightly ventral surfaces of phallus (everted cloaca). For scale see Fig. 4. rm Fig. 6 Uraeotyphlus cf. narayani (field tag MW 254). Dissected cloaca of mature male. The cloaca has been opened mid-ventrally and pinned to reveal the lumenal surface of the phallodeum and posterior part of the urodeum. The incision has longitudinally bisected the right ventrolateral longitudinal ridge so that parts of it lie on each side of the open cloaca. Scale =
. Bulletin of the Natural History Museum Zoology. Fig. 5 Uraeotyphlus cf. narayani (field tag MW 207). Views of (a) dorsal, and (b) distal and slightly ventral surfaces of phallus (everted cloaca). For scale see Fig. 4. rm Fig. 6 Uraeotyphlus cf. narayani (field tag MW 254). Dissected cloaca of mature male. The cloaca has been opened mid-ventrally and pinned to reveal the lumenal surface of the phallodeum and posterior part of the urodeum. The incision has longitudinally bisected the right ventrolateral longitudinal ridge so that parts of it lie on each side of the open cloaca. Scale = 3 mm. longitudinal grooves at the anterior end of the phallodeum, at least some of which may enter the blind sacs, where present ( Geotrypeles Peters, 1879, pers. obs.). POSTERIOR PHALLODEUM. The distinction between the anterior and posterior phallodeum is sometimes less clear cut than that between the phallodeum and urodeum. Wake (1972) reported that the longitudinal ridges of the anterior phallodeum continue posteriorly to the vent. We find that the major longitudinal ridges reduce greatly posteriorly, either abruptly or gradually, that they may or may not extend as far as the vent, and that the pattern of ridges within the posterior phallodeum is irregular or less obviously regular than those of the anterior phallodeum. The phallodeum narrows dramatically posteriorly, shows considerable variation in length, and has its terminal portion surrounded by a sphincter of variable size. PHALLODEAL ORNAMENTATION. The major longitudinal ridges of the anterior phallodeum may be more or less invested with, or elaborated into, tuberosities, transverse ridges and grooves, longi- tudinal crests, or spines that are often in distinctive patterns ( Figs. 6, 9). Isolated thickenings or other ornaments may also occur in the spaces between the major longitudinal ridges. The ridges associated with the dorsolateral sulci bear such features only posterior to the sulci ( Figs. 4, 7, 9).
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