. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 163. Fig. 23. Peroniceras (Peroniceras) subtricarina- tum (d'Orbigny, 1850). Two successive sutures of SAS Z1002 to illustrate influence of orna- ment on details of suture, in this case especially the width of the stem of saddle L/Uz. Desio's (1920: 206, pi. 25 (fig. 3)) P. subtricarinatum var. etruscum has weak ornament on the inner whorls, and lacks umbilical tuberculation on the outer whorls. Furthermore, the whorl section is much higher than wide. As Desio (192
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 163. Fig. 23. Peroniceras (Peroniceras) subtricarina- tum (d'Orbigny, 1850). Two successive sutures of SAS Z1002 to illustrate influence of orna- ment on details of suture, in this case especially the width of the stem of saddle L/Uz. Desio's (1920: 206, pi. 25 (fig. 3)) P. subtricarinatum var. etruscum has weak ornament on the inner whorls, and lacks umbilical tuberculation on the outer whorls. Furthermore, the whorl section is much higher than wide. As Desio (1920: 207) pointed out, the specimen is very close to P. (P.) dravidicum. P. cf. subtricarinatum var. tridorsatum of Desio (1920: 205, pi. 12 (fig. 10)) is poorly preserved, but because of the single ribbing falls beyond the limits of this species. P. (P.) tenuis van Hoepen (1965: 7, pi. 3, text-figs Ib-e) merely represents the inner whorls of a weakly ornamented form of P. (P.) subtricarinatum as Fig- ures 21-22 show, and is thus included in the synonomy. P. haasi Young (1963: 72, pi. 34 (figs 3-4), pi. 35 (figs 1-2)) from the Coni- acian of Texas has the general appearance of P. (P.) subtricarinatum but weaker ornament. Given more material it might be possible to include it in the strict synonomy of P. (P.) subtricarinatum, as was done with P. (P.) tenuis van Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
