. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . D. If- i W yf> Figure 6 •ems (fiardeniceras) gardeni (Baily). x 1. A-B. Lateral and ventral views of). Ventral and lateral views of SAM-PCA1693. E-F. Damesites sugata (Forbes),x ]. Ventral and lateral views of SAM-PCA1968. STRA TIGRAPHYAND PALAEONTOLOGY OF BABA FORMA TION, SAO NICOLA U, ANGOLA 159 only ornament is periodic prorsiradiate ribs (?constrictions), but the specimen gives theimpression of having had these separated by weakly developed ribs. The better-preserved juvenile shell, SAM-PCA2016, is compressed
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . D. If- i W yf> Figure 6 •ems (fiardeniceras) gardeni (Baily). x 1. A-B. Lateral and ventral views of). Ventral and lateral views of SAM-PCA1693. E-F. Damesites sugata (Forbes),x ]. Ventral and lateral views of SAM-PCA1968. STRA TIGRAPHYAND PALAEONTOLOGY OF BABA FORMA TION, SAO NICOLA U, ANGOLA 159 only ornament is periodic prorsiradiate ribs (?constrictions), but the specimen gives theimpression of having had these separated by weakly developed ribs. The better-preserved juvenile shell, SAM-PCA2016, is compressed, moderatelyinvolute, with c. 60 per cent of the penultimate whorl covered. The fairly narrowumbilicus (27-31% of the diameter) is rather deep, with a steep umbilical wall and evenlyrounded shoulder, and the convex flanks converge towards the narrowly arched comprises prominent periodic constrictions that flex forwards slightly near theventer and, on the adoral half of the outer whorl, are separated by very weak, indistinct,flexuous riblets. Measurements Spec
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
