Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . Fig. 77. A-C. Helicancyloceras (Nonyaniceras) circulare sp. nov. BMNH C79708 from locality166, Zululand, Aptian III. x 2. D-E. Helicancyloceras {Helicancyloceras) vohimaranitraensis(Collignon, 1962). BMNH C79710 from locality 166, Zululand, Aptian III. x 2. F-G. Helican-cyloceras {Helicancyloceras) sp. indet. BMNH C79693 from locality 166, Zululand, Aptian III. x 2. CRETACEOUS FAUNAS FROM SOUTH AFRICA 339 Fig. 78. A-B. Helicancyloceras {Nonyaniceras) circulare sp. nov. SAS H71/2, holotype fromlocality 151, Zulula
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . Fig. 77. A-C. Helicancyloceras (Nonyaniceras) circulare sp. nov. BMNH C79708 from locality166, Zululand, Aptian III. x 2. D-E. Helicancyloceras {Helicancyloceras) vohimaranitraensis(Collignon, 1962). BMNH C79710 from locality 166, Zululand, Aptian III. x 2. F-G. Helican-cyloceras {Helicancyloceras) sp. indet. BMNH C79693 from locality 166, Zululand, Aptian III. x 2. CRETACEOUS FAUNAS FROM SOUTH AFRICA 339 Fig. 78. A-B. Helicancyloceras {Nonyaniceras) circulare sp. nov. SAS H71/2, holotype fromlocality 151, Zululand, Aptian IV. x 1,5. C. Helicancyloceras {Helicancyloceras) vohimaranitra-ensis. A1924 from locality 168, Aptian III-IV. x 1,5. D. Helicancyloceras {Nonyaniceras)sp. indet. SAM-PCZ5504 from unknown locality, southern part Mkuze Game Reserve, x 1,5. 340 ANNALS OF THE SOUTH AFRICAN MUSEUM half whorl, H. (H) densecostatum has about 25. Transitional forms like SASZ8/Hd (Fig. 76B) with 21 ribs per half whorl connect the species and may bereferred to either. The presence of tubercles on the body chamber of somespecimens points to affinities with H. (Nonyaniceras). The presence of tuberclesin the very early and late stages with a non-tuberculate middle stage is a situationcomparable to that found in Australiceras. It is not known if large forms alsooccur in this species, but the outer whorl is virtually bilateral symmetrical. Occurrence Upper Aptian of Zululand. Helicancyloceras (Hel
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