. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO THE KNOWLEDGE OF MARINE MOLLUSCA 283 Trochus suarezensis Fischer 1880, later transferred to Cantharidus (see Dautzen- berg, 1929, p. 538). A comparison of a series from Madagascar and the east coast of Africa might be interesting. The radula shows that fultoni is not a Calliostoma. The variation in the number of lirae is remarkable but not unexpected in the case of a lirate shell. The most common, and therefore to be regarded as normal, form is multilirate. There is one 6-lirate
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO THE KNOWLEDGE OF MARINE MOLLUSCA 283 Trochus suarezensis Fischer 1880, later transferred to Cantharidus (see Dautzen- berg, 1929, p. 538). A comparison of a series from Madagascar and the east coast of Africa might be interesting. The radula shows that fultoni is not a Calliostoma. The variation in the number of lirae is remarkable but not unexpected in the case of a lirate shell. The most common, and therefore to be regarded as normal, form is multilirate. There is one 6-lirate shell from Delagoa Bay; but the longest series from any one locality is that from Mossel Bay, most of which are in good condition. Variation on the whorl does not always coincide with that on the base: shells with multilirate whorls usually have a multilirate base, but not always. Haughton's statement (1937) that mosselense was extinct must be qualified. Like Cerithium kochi (Barnard, Part III, p. 131) this species at one time was living much farther westwards along the coast than it is today. It is doubtful if it is living as far south as Port Elizabeth. One may even doubt whether it is living on the Natal coast; Burnup's unique specimen of bisculptum (? living) and 2 dead shells in the South African Museum appear to be the only records. In the Mossel Bay raised beach fultoni is one of the most abundant species. Angaria lacunosa Fig. 20 A worn specimen, the upper surface partially covered with a Polyzoan, seems to belong to this genus. The upper surface is irregularly oval in outline, 9x8 mm.; a faint suture is visible in places. Three cavities appear to represent apertural expansions on previous whorls; one such cavity is at the upper corner of the aperture, and one slightly behind it. Base convex, with traces of spiral lirae, best seen near the narrow umbilicus, which is not completely covered by the columellar glaze. From one of the Pieter Faure boctom-samples from N
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
