. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. ?#%1. B Fig. 1. Baculites alavensis Santamaria Zabala, 1996. ECl-108a from the Upper Campanian of Ecay. x 1. specimens, the ribs pass over the venter without diminishing in strength and with a sharp apertural curvature. Bifurcating or intercalatory ribs near the venter are extremely rare. Ribbing over the dorsum is generally much weaker than on the flanks or on the venter ( Fig. 2A-C), but in some specimens ( Fig. 2D-F) ribbing on the dorsum is nearly, or as strong as, on the rest of the shel
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. ?#%1. B Fig. 1. Baculites alavensis Santamaria Zabala, 1996. ECl-108a from the Upper Campanian of Ecay. x 1. specimens, the ribs pass over the venter without diminishing in strength and with a sharp apertural curvature. Bifurcating or intercalatory ribs near the venter are extremely rare. Ribbing over the dorsum is generally much weaker than on the flanks or on the venter ( Fig. 2A-C), but in some specimens ( Fig. 2D-F) ribbing on the dorsum is nearly, or as strong as, on the rest of the shell. Rib density is generally two-and-a-half to three ribs per whorl height, but it may be as low as two (Fig. 3G-I). Some of our specimens appear to be completely devoid of ribbing ( Fig. 4A). We suspect that these are merely rare, smooth variants of B. alavensis rather than a different species. Part of the aperture is preserved in one specimen (Fig. 3A-C).. 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
