Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . body chamber. One of thespecimens, however, SAS-H179/19 (Fig. 99B) retains the rectangular whorlsection to a greater diameter than the other specimens. In most of the specimens ribbing is single on the outer whorls. In SAS-Z1754 (Fig. 100), however, bifurcations are quite common on the outer from being more compressed than the other specimens, there seems to beno other significant difference, and the specimen is also referred to T. collignonisp. nov. It appears to connect morphologically with T. soutoni,
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . body chamber. One of thespecimens, however, SAS-H179/19 (Fig. 99B) retains the rectangular whorlsection to a greater diameter than the other specimens. In most of the specimens ribbing is single on the outer whorls. In SAS-Z1754 (Fig. 100), however, bifurcations are quite common on the outer from being more compressed than the other specimens, there seems to beno other significant difference, and the specimen is also referred to T. collignonisp. nov. It appears to connect morphologically with T. soutoni, described below. Differences between T. collignoni and T. texanus are distinct in densityof ribbing in typical forms, but become obscure when comparing T. collignoniwith T. texanus var. hispanica. Here crenulation of the keel may be of assistancein differentiating between the species. T. quinquenodosus (Figs 102-103) is a species with similar ribbing andcoiling, but differs in that tuberculation is generally clavate in all the rows. 134 ANNALS OF THE SOUTH AFRICAN MUSEUM. I f.
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
