Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . , or due to abundant bifurcations and intercalations of (1963: 76) key to the classification of the Texanitinae is of little usein this case. Despite this example of isochronous homoeomorphy, Submortoni-ceras and Delawarella should be maintained separate, because of differentphylogenies and ontogenetic development. Both Young (1963: 39) and Matsumoto (1970: 239) agree in derivingSubmortoniceras from Texanites, a view corroborated by the South Africanmaterial. As described above, S. w
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . , or due to abundant bifurcations and intercalations of (1963: 76) key to the classification of the Texanitinae is of little usein this case. Despite this example of isochronous homoeomorphy, Submortoni-ceras and Delawarella should be maintained separate, because of differentphylogenies and ontogenetic development. Both Young (1963: 39) and Matsumoto (1970: 239) agree in derivingSubmortoniceras from Texanites, a view corroborated by the South Africanmaterial. As described above, S. woodsi is derived gradually from T. soutonithrough reduction of umbilical diameter and effacement of the ornament onthe outer whorls. Submortoniceras appears to be a dead-end in texanitinedevelopment, and the last Submortoniceras species occur in the Middle Cam-panian of Madagascar. As is seen from the list of species referred to the genus, the majority seemto be endemic to the regions from which they were first described. None of the 236 ANNALS OF THE SOUTH AFRICAN MUSEUM.
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
