. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO KNOWLEDGE OF MARINE MOLLUSCA 99 One specimen, 25 mm., from Saldanha Bay (), has ribs on 5\ whorls, then after an injury, continues with extremely feeble ribs which become obsolete on the body whorl; the sinus, however, continues to form the characteristic keel. Other specimens become ribless from the 3rd or 4th whorl onwards (cf. sigillata). var. sigillata Rve. Fig- 5 b Length of aperture subequal to, or a little shorter than spire (but apex broken in all specimens). Proto
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO KNOWLEDGE OF MARINE MOLLUSCA 99 One specimen, 25 mm., from Saldanha Bay (), has ribs on 5\ whorls, then after an injury, continues with extremely feeble ribs which become obsolete on the body whorl; the sinus, however, continues to form the characteristic keel. Other specimens become ribless from the 3rd or 4th whorl onwards (cf. sigillata). var. sigillata Rve. Fig- 5 b Length of aperture subequal to, or a little shorter than spire (but apex broken in all specimens). Protoconch? Postnatal whorls 6-6 J. Whorls smooth, faint indications of ribs on the upper 4 or 5 whorls, and even less defined on earlier part of 6th whorl; a feeble spiral lira immediately below suture, and another marking the lower boundary of sulcus and middle of the lip sinus, thus corresponding with the series of nodules in typical sinuata; below this 2 or 3 additional very feeble lirae on body whorl, best seen where they have become white from abrasion. Sulcus very shallowly concave; lip sinus moderately wide, shallow, growth-lines very slightly curved. 19 (apex broken x 9 mm. (S. Afr. Mus.); 20 (protoconch missing) x 8 mm. ().. Fig. 5. a. Clavatula sinuata Born. b. var. sigillata Rve., worn, especially the apical whorls. c. C. confusa Smith, d. C. kraussi (Smith), e. C. subventricosa (Smith). /. C. semicostata 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
