. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 23. a. Surcula dissimilis Watson, protoconch. b. Tunis ambages n. sp., one whorl and protoconch. Comparison of the figures shows that the lower part of the columella is a little more curved and the aperture broader in alberti than in dissimilis. The Cape specimens agree better with the latter. For this reason it seems better to identify the Cape specimens with dissimilis, although evidence of a faunistic relationship, dating perhaps from Miocene times, between the north and south Atlantic off th
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 23. a. Surcula dissimilis Watson, protoconch. b. Tunis ambages n. sp., one whorl and protoconch. Comparison of the figures shows that the lower part of the columella is a little more curved and the aperture broader in alberti than in dissimilis. The Cape specimens agree better with the latter. For this reason it seems better to identify the Cape specimens with dissimilis, although evidence of a faunistic relationship, dating perhaps from Miocene times, between the north and south Atlantic off the west coast of Africa is accumulating. (See: Cancellaria (Sveltia) lyrata.) The course of the growth-lines is not shown very clearly in the figures of either dissimilis or alberti, certainly not the almost horizontal direction at the lower boundary of the sulcus which is so conspicuous in the present specimens. The animal of alberti was reported to be closely related to that of the genus Bela (not Bela of Thiele 1929), but no figure of its radula was given. Presumably it had no operculum. Tunis ambages n. sp. Fig. 23 b Protoconch 3 whorls, diam. 1-25-1-3, alt. 1*3-1 *5 mm., with axial riblets, (as in Tunis). Postnatal whorls with 4 strong spiral keels (profile of whorl. 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
