. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. PLEISTOCENE MOLLUSCS FROM THE NAMA^UALAND COAST 215. Fig. 8. Donax haughtoni Diagrammatic cross-section of valve to illustrate distance d—greatest width, hinge excluded. Material Holotype: K1430 L. 97-0 mm A. 6i-omm Paratype: K1431 70-5 mm 44-0 mm (A complete range of valves from 20 mm to 97 mm in length, in the South African Museum.) Remarks This species most closely resembles Donax [Iphigenia) rogersi Haughton, from the coastal deposits of Doornbaai. Haughton's material in the S
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. PLEISTOCENE MOLLUSCS FROM THE NAMA^UALAND COAST 215. Fig. 8. Donax haughtoni Diagrammatic cross-section of valve to illustrate distance d—greatest width, hinge excluded. Material Holotype: K1430 L. 97-0 mm A. 6i-omm Paratype: K1431 70-5 mm 44-0 mm (A complete range of valves from 20 mm to 97 mm in length, in the South African Museum.) Remarks This species most closely resembles Donax [Iphigenia) rogersi Haughton, from the coastal deposits of Doornbaai. Haughton's material in the South African Museum, however, includes both D. (/.) rogersi and D. haughtoni. Haughton (1931: 36), states that the smaller shells obtained from The Point, Van Rhynsdorp, have the umbo well in advance of the midline of the shell but that the umbo's position 'accords well with that in equivalent growth stages of the larger shells from Doornbaai and Alexander Bay, and these specimens fall therefore within the limits of the species'. With more material now available it would seem that this smaller and more elongate form men- tioned by Haughton is the present species and not a young form of D. (/.) 0 in p • Donax(iDhiggnia) roacrsi Haughton «H- t • Donax haughtoni • cL • A-B Mean Width/Length * o • 3= 0 • 0 V ^° e • « 0 • • • 0 c . •• 0 " Q. "og. 0 0 (I V.' •a*/'!^--'^' :t •ju^^"^*** * ,2" 10 _ir*J»» * • (Q « ._^--'*''^* Q) • ^— ~i «—-* '*^* « ..,^*''*^ 0) A '*''^ 2 • 0 0 20 40 60 80 too 120 ' Ma Greatest length mm. Fig. 9. Comparison of greatest length/greatest width (hinge excluded) ratios in Donax (/.) rogersi Haughton and D. haughtoni 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
