. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO THE KNOWLEDGE OF MARINE MOLLUSCA 319 Incidentally R. congoensis Thiele (1925, p. 260, pi. 42 (30), fig. 15) looks remarkably like the West African conformis Monterosato as figured by Nickles (i95°> P- J35> fig- 277)- Fam. Atyidae Haminea alfredensis Bartsch Fig. 28 g Haminea alfredensis Bartsch, 1915, p. 6, pi. 1, fig. Fig. 28. a, Retusa natalensis n. sp., with apical view; b, Volvula mutabilis n. sp., with apex of juv. 2-75 mm., and immature shell 3 mm.; c, Actaeocina
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO THE KNOWLEDGE OF MARINE MOLLUSCA 319 Incidentally R. congoensis Thiele (1925, p. 260, pi. 42 (30), fig. 15) looks remarkably like the West African conformis Monterosato as figured by Nickles (i95°> P- J35> fig- 277)- Fam. Atyidae Haminea alfredensis Bartsch Fig. 28 g Haminea alfredensis Bartsch, 1915, p. 6, pi. 1, fig. Fig. 28. a, Retusa natalensis n. sp., with apical view; b, Volvula mutabilis n. sp., with apex of juv. 2-75 mm., and immature shell 3 mm.; c, Actaeocina natalensis n. sp.; d, Actaeocina species A; e, Actaeocina species B. Radula plates of: f, Haminea gracilis Sow.; g, H. alfredensis Bartsch; h, Pseudactaeon albus (Sow.), with portion of radula showing lateral plates in situ (semidiagram- matic); i, Cylichna tubulosa Gould. This may have to become a synonym of natalensis (Krss.). Turton seemed to think that the pear-shaped alfredensis graded into the oval natalensis. The pear shape is more noticeable in the larger shells; juveniles 3-5-4 mm. long are oval. But neither in these juveniles nor in any specimen I have seen does the posterior margin of the outer lip extend so prominently beyond the apex as in Krauss's figure. I have seen no Natal specimens. The largest specimen measures 19 x 13 mm., and came from Little Brak River estuary, near Mossel 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 South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
