Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . B Fig. 20. A-B. Ancyloceras (Adouliceras) gr. ex mozambiquense-cooperi. BMNH C78884 fromlocality 170, Zululand, Aptian I—II. Specimen with finer ribbing than previous examples. x 0,67. Form 4Fig. 21A Description and discussion Crozier SAS 54/45/6 completely lacks major ribbing on the ascending crozier may be compared with A. {Ad.) ewaldi Dames (1880: 690, pi. 25,pi. 26 (fig. 1)). The latter species, however, has stronger and more roundedribbing on the shaft. This specimen is crushed, hence no measurements a
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . B Fig. 20. A-B. Ancyloceras (Adouliceras) gr. ex mozambiquense-cooperi. BMNH C78884 fromlocality 170, Zululand, Aptian I—II. Specimen with finer ribbing than previous examples. x 0,67. Form 4Fig. 21A Description and discussion Crozier SAS 54/45/6 completely lacks major ribbing on the ascending crozier may be compared with A. {Ad.) ewaldi Dames (1880: 690, pi. 25,pi. 26 (fig. 1)). The latter species, however, has stronger and more roundedribbing on the shaft. This specimen is crushed, hence no measurements are given. CRETACEOUS FAUNAS FROM SOUTH AFRICA 249. Fig. 21. A-B. Ancyloceras (Adouliceras) gr. ex mozambiquense-cooperi. A. SAS 54/45/6 from locality 170, Zululand, Aptian I-II. Form 4. x 0,57. B. SAS 54/45/5 from same locality and horizon as above. Form 2. x 0,53. 250 ANNALS OF THE SOUTH AFRICAN MUSEUM Form 5 Fig. 22Description and discussion Crozier SAS 54/45/4 is a micromorph with an ovoid whorl section on theshaft and with plain, simple ribbing throughout, apart from a smooth zone onthe descending shaft and a slightly flared rib just before the aperture. A fewpaired ribs are more prominent than the others. The rounded whorl section may indicate that this type of crozier maybelong to the inner whorls referred to A. {Ad.) cooperi sp. nov. The absence ofmajor costae on the crozier is reminiscent of that of Colchidites colchicusDjanelidze (1926, pi. 1 (fig. 1)). The smooth part of the descending limb (whichmay be a malformation) is reminiscent of Andersons (1938) genus body chamber of Shastoceras, however, is inflated
Size: 1319px × 1895px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
