. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 24. Pseudocalycoceras angolaense (Spath). Whorl sections. A. SAM-PCA2731. B. SAM-PCA2767. C. SAM-PCA2732. xl tubercles, although faint, are evident at 15 mm diameter, whereas in SAM-PCA2767 they are still absent at 28 mm diameter, whilst the latter also shows no signs of umbilical tubercles at the same stage. In SAM-PCA2772 (Fig. 26G), at about the same diameter, the umbilical tubercles are weak but noticeable, with upper and lower ventro-lateral and siphonal tubercles. The ribbing is fairly str
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 24. Pseudocalycoceras angolaense (Spath). Whorl sections. A. SAM-PCA2731. B. SAM-PCA2767. C. SAM-PCA2732. xl tubercles, although faint, are evident at 15 mm diameter, whereas in SAM-PCA2767 they are still absent at 28 mm diameter, whilst the latter also shows no signs of umbilical tubercles at the same stage. In SAM-PCA2772 (Fig. 26G), at about the same diameter, the umbilical tubercles are weak but noticeable, with upper and lower ventro-lateral and siphonal tubercles. The ribbing is fairly strong but is not connected to the umbilical tubercles. In SAM-PCA2731 the umbilical tubercles become prominent at about 28 mm diameter. At about this same stage the flanks become flat, or slightly convex, and almost parallel, with the greatest width at mid-flank. In this same specimen there are 11 siphonal clavi within 40 mm along the venter at a diameter of 35 mm, but only 6 at 57 mm diameter. In SAM-PCA2734, with about one-third of a whorl of body chamber preserved, there are only 5 siphonal clavi in an equal distance at 68 mm diameter. This specimen also shows, as does the holotype (Fig. 23), the simple, coarse, straight ribbing on the body Fig. 25. Pseudocalycoceras angolaense (Spath). Suture-line of SAM-PCA2719 at about 60 mm 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
