Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . \. Fig. 64. Plesiotexanites stangeri (Baily, 1855). BMNH-C19459. x 0,7. occurrences in the Upper Santonian. As far as could be ascertained, thereseems to be no stratigraphic difference in occurrence between the varietiesdensicosta and sparsicosta or the typical form. These findings seem to be sup-ported by Collignon (1966fl) and Young (1963), although the authors doubtif the Malagasy and South African biozonations are compatible with thoseof the Gulf Coast. Collignon records var. densicosta and sparsicosta from theMid

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Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . \. Fig. 64. Plesiotexanites stangeri (Baily, 1855). BMNH-C19459. x 0,7. occurrences in the Upper Santonian. As far as could be ascertained, thereseems to be no stratigraphic difference in occurrence between the varietiesdensicosta and sparsicosta or the typical form. These findings seem to be sup-ported by Collignon (1966fl) and Young (1963), although the authors doubtif the Malagasy and South African biozonations are compatible with thoseof the Gulf Coast. Collignon records var. densicosta and sparsicosta from theMiddle Santonian, and var. densicosta from the Upper Santonian of Mada- 84 ANNALS OF THE SOUTH AFRICAN MUSEUM

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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory