. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 128 ANNALS OF THE SOUTH AFRICAN MUSEUM reticulate, with rather elongated fossae. Sub-centrally there is a small, ovate flat area over the MS from which short ribs radiate in the central valve area. Internal features. The hinge is characterized by a particularly straight, narrow, smooth ME bar in LV. MS consist of an elliptical cluster of four adductors and a 'fish hook'-shaped anterior scar. Remarks The closest relative to B. namaquaensis sp. nov. is the Miocene species B. radia- topora (Seguenza, 18
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 128 ANNALS OF THE SOUTH AFRICAN MUSEUM reticulate, with rather elongated fossae. Sub-centrally there is a small, ovate flat area over the MS from which short ribs radiate in the central valve area. Internal features. The hinge is characterized by a particularly straight, narrow, smooth ME bar in LV. MS consist of an elliptical cluster of four adductors and a 'fish hook'-shaped anterior scar. Remarks The closest relative to B. namaquaensis sp. nov. is the Miocene species B. radia- topora (Seguenza, 1880), which has been recorded from the Mediterranean ( Cola- longo 1966), and Gabon (Van den Bold 1966, pi. 1 (fig. 3)). The two species can be distinguished by the ornamentation in the posterior half: in B. radiatopora ribs parallel to the VM and DM converge posteriorly, whereas in B. namaquaensis the median and posterodorsal part of the valve is reticulate. In this respect, B. radiatopora is very similar to B. sulcifera (Brady), but both B. radiatopora and B. sulcifera lack the flat, ovate sub-central feature on the exterior surface of B. namaquaensis. Distribution Buntonia namaquaensis sp. nov. occurs in a relatively narrow zone along the mid- to outer shelf between 20°S and 35°S (Fig. 72A). Modem specimens were collected only at site TBD 2446 (310 m) on the Namaqualand shelf 30° - s. 1 1 1 15° 20°E 1 1 1 1 1 1 1 !' 1 20° - '? - '\ - +1- +1- 1 WALVIS BAY - + 1 + \ 1 - + \ X - ^ 30°- \ NAMAQUALAND S A \ ,J - \ - ^ C. AGULHAS Fig. 72. Distribution of Buntonia on the continental margin off south-western Africa. A. B. nama- quaensis sp. nov. (modem site = black square). B. B. rogersi sp. nov. (modem sites enclosed by dashed Une).. 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.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
