. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . B Figure 6 A. Tetragonites beantalyensis Collignon. The holotype, NHMP-R708, from the Coniacian of Beantaly,Madagascar. Figured by Collignon (1956, pi. 10 (figs 1-2)). B-C. Tetragonites mitraikyensis(Collignon). The holotype, NHMP-R706, from the Upper Santonian of Mitraiky, Madagascar. Figured by Colljgnon (1956, pi. 11 (fig. 2)). All x 1. Discussion The characters of this species have been covered by Matsumoto (1959) and Jones(1967). At a comparable diameter, Madagascan T. beantalyensis Collignon (1956: 83,pi. 10 (
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . B Figure 6 A. Tetragonites beantalyensis Collignon. The holotype, NHMP-R708, from the Coniacian of Beantaly,Madagascar. Figured by Collignon (1956, pi. 10 (figs 1-2)). B-C. Tetragonites mitraikyensis(Collignon). The holotype, NHMP-R706, from the Upper Santonian of Mitraiky, Madagascar. Figured by Colljgnon (1956, pi. 11 (fig. 2)). All x 1. Discussion The characters of this species have been covered by Matsumoto (1959) and Jones(1967). At a comparable diameter, Madagascan T. beantalyensis Collignon (1956: 83,pi. 10 (fig. 1)) (fig. 6A) has a flatter venter than the Angolan material; it is said to beconnected to contemporaneous T embergeri Collignon (1956: 84, pi. 10 (figs 2-3)) byintermediates. Tetragonites superstes van Hoepen (Kennedy & Klinger, 1911 b: 162, figs 7-8,12A-C) differs from the Angolan material in being more inflated, with only four faintconstrictions at comparable diameter. Santonian Tetragonites mitraikyensis (Collignon)(1956: 86, pi. 11 (fig. 2)) is more involute,
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
