Annals of the South African Museum - Annale van die Suid-Afrikaanse Museum (1980) (18413551912)

Title: Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum
Identifier: annalsofsoutha8319808sout (find matches)
Year: 1898 (1890s)
Authors: South African Museum
Subjects: Natural history
Publisher: Cape Town : The Museum
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library



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350 ANNALS OF THE SOUTH AFRICAN MUSEUM
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Fig. 200. Distoloceras spinosissimum (Hausmann). Ventral and lateral views of BMNH- XI08A, showing well-developed main ribs and thus very close to D. hirtzi Collignon. x 0,66. Photo: W. J. Kennedy. section would change with uncoiling), while prior to the appearance of inter- calated ribs in D. hystrix, the ribbing is seen to arise in pairs from umbilical tubercles, whereas in D. spinosissimum they are simple. Distoloceras laticostatum Imlay is known only from tightly coiled, pyritic specimens. It is more compressed, with closer, more strongly developed ribs which may bifurcate at either the umbilical shoulder, or at mid-flank. Bifurca- tion of ribbing has not been recorded from D. spinosissimum. Distoloceras