Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . one, butthereafter becomes stronger again towards the later part of the phragmoconeand the body chamber. Very strong ribbing is developed in SAS-Zl 138 (Fig. 187)on the body chamber, containing the full complement of pentatuberculateornament. Lateral tuberculation is also still visible on the body chambers ofSAS-Z1875 (Fig. 188), SAM-PCZ5896 and SAM-PCZ5897 (Fig. 192). SAM-PCP5716 (Fig. 193) has a few bifurcating ribs on the body chamber as in Texa-nites soutoni The suture line is variable, ranging from wide, sho
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . one, butthereafter becomes stronger again towards the later part of the phragmoconeand the body chamber. Very strong ribbing is developed in SAS-Zl 138 (Fig. 187)on the body chamber, containing the full complement of pentatuberculateornament. Lateral tuberculation is also still visible on the body chambers ofSAS-Z1875 (Fig. 188), SAM-PCZ5896 and SAM-PCZ5897 (Fig. 192). SAM-PCP5716 (Fig. 193) has a few bifurcating ribs on the body chamber as in Texa-nites soutoni The suture line is variable, ranging from wide, short lobes to long andnarrowly splayed lobes (Figs 187, 190-194). Discussion The authors have previously commented on the difficulty in interpretingthis species (Kennedy & Klinger 1973: 103). Spaths original figures are poor,his description is too brief and stratigraphic data are lacking. The holotype of Mortoniceras woodsi, here refigured as Figure 186, isbased on an incomplete inner whorl of a specimen c. 80 mm in diameter, from CRETACEOUS FAUNAS FROM SOUTH AFRICA 245. Fig. 187. Submortoniceras woodsi natalense ssp. nov. Paratype SAS-Z1138. Specimen withwide umbilicus, connecting to Texanites soutoni. X 0,5. an unknown horizon at Umkwelane Hill. The innermost whorls up to a dia-meter of c. 50 mm are incomplete, and only the ventral half of the flanks andthe venter are preserved, showing strong marginal (4) and external (5) tubercles,weaker submarginal (3) tubercles, and an entire keel. The last third of a whorlpreserved on the holotype shows very faint ribs bifurcating from strong inwardleaning umbilical (1) tubercles, with very faint lateral (2) tubercles, slightly 246 ANNALS OF THE SOUTH AFRICAN MUSEUM
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
