Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . (Crick, 1907). SAS-H199/8. Showing the undulating central keel, x 0,64. The inner and outer whorls of the holotype are here refigured photo-graphically (Figs 17-20A) to illustrate the distinct ornament in the adult stageas well as the ontogeny. In the adult, the species has very distinct ornament and is easily identifiedby the spinosity of the umbilical, submarginal and marginal tubercles, and thevery clavate external tubercles protruding far above the undulating keel. Theinner whorls are distinguished by the stout or
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . (Crick, 1907). SAS-H199/8. Showing the undulating central keel, x 0,64. The inner and outer whorls of the holotype are here refigured photo-graphically (Figs 17-20A) to illustrate the distinct ornament in the adult stageas well as the ontogeny. In the adult, the species has very distinct ornament and is easily identifiedby the spinosity of the umbilical, submarginal and marginal tubercles, and thevery clavate external tubercles protruding far above the undulating keel. Theinner whorls are distinguished by the stout ornament and rounded, subtrigonalwhorl section. Matsumoto (1970: 255) pointed to the similarity between P. umkwelanenseand P. zeilleri and suggested that, if sufficient material were available, distinc-tion between the two species may prove to be of subspecific value only. P. zeilleriis difficult to interpret, being monotypic and having been figured once only, byDe Grossouvre. According to De Grossouvre (1894: 67) the specimen figured CRETACEOUS FAUNAS FROM SOUTH AFRICA 41.
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Photo credit: © The Reading Room / Alamy / Afripics
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Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
