. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . Figure Prionocycloceras carvalhoi (Howarth). x 1. A-B. Ventral and lateral views of SAM-PCA191C-D. Ventral and lateral views of SAM-PCA1896. UPPER CRETA CEOUS (TURONIAN-CONIA CI AN) AMMONITES FROM SA O NICOLA U, ANGOLA 135 Prionocycloceras carvalhoi (Howarth, 1968)Figs 5A-D, 9B-C, 20D, 27-28 71967 Prionocycloceras guayabanum (Steinmann) Collignon, p. 48, pi. 29 (figs 1-3 only).1968 Prionocyclus carvalhoi Howarth, p. 224, pi. 1 (figs 8-11), pi. 2 (figs 3-6). 19786 Prionocycloceras carvalhoi (Howarth); Cooper, p. 4, f
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . Figure Prionocycloceras carvalhoi (Howarth). x 1. A-B. Ventral and lateral views of SAM-PCA191C-D. Ventral and lateral views of SAM-PCA1896. UPPER CRETA CEOUS (TURONIAN-CONIA CI AN) AMMONITES FROM SA O NICOLA U, ANGOLA 135 Prionocycloceras carvalhoi (Howarth, 1968)Figs 5A-D, 9B-C, 20D, 27-28 71967 Prionocycloceras guayabanum (Steinmann) Collignon, p. 48, pi. 29 (figs 1-3 only).1968 Prionocyclus carvalhoi Howarth, p. 224, pi. 1 (figs 8-11), pi. 2 (figs 3-6). 19786 Prionocycloceras carvalhoi (Howarth); Cooper, p. 4, fig. 7. Material Many fragmentary specimens, including SAM-PCA1754, 1758, 1832, 1896, 1911,1916, 1931, 1942, 1944, 1958, and 1965, from Beds V and VI. Description The shell is compressed, evolute, with about 15 per cent of the preceding whorlcovered. The umbilicus is moderately wide (27-43 per cent of the shell diameter),shallow, with subvertical walls and evenly rounded shoulders. The flat flanks aresubparallel and the broad venter is flattened in costal section, resulting
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
