. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . )(see also Gill & Cobban 1973, fig. 5a; Kennedy etal 2000: 7, figs 3^1, 6-7, 8c, d, 9-13, 62))shows loose, helical coils and poorly developed tuberculation on the phragmocone, comparedto the stronger ornament in the younger D. (D.) stephensoni and D. (D.) cheyennense. Occurrence Campanian III of KwaZulu. Didymoceras (Didymoceras) 45 Material SAM-PCZ7638 from locality 109C, the western part of Nibela Peninsula, KwaZulu,St Lucia Formation, Campanian III. Description and discussion A single specimen differs fro
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . )(see also Gill & Cobban 1973, fig. 5a; Kennedy etal 2000: 7, figs 3^1, 6-7, 8c, d, 9-13, 62))shows loose, helical coils and poorly developed tuberculation on the phragmocone, comparedto the stronger ornament in the younger D. (D.) stephensoni and D. (D.) cheyennense. Occurrence Campanian III of KwaZulu. Didymoceras (Didymoceras) 45 Material SAM-PCZ7638 from locality 109C, the western part of Nibela Peninsula, KwaZulu,St Lucia Formation, Campanian III. Description and discussion A single specimen differs from Didymoceras (D.) australis in being much larger andstill septate at a diameter of c. 50 mm, and in having tighter coiling. This specimen mayconnect with the largest fragment of D. (D.) australis, SAM-PCZ7576 in having a similarmode of ornamentation. It is possible that the differences in size are due to dimorphism,but with the limited material available, it is impossible to say with certainty. Occurrence Campanian III of KwaZulu. 288 ANNALS OF THE SOUTH AFRICAN MUSEUM. U co o .5 -J00 =3 ?a <^IT) O s eg oom ^O r-- NU I ^ v- Co s o5 CRETA CEOUS FA UNAS FROM ZUL ULAND AND NA TAL, SOUTH AFRICA 289 Didymoceras (Didymocerasl) africanum sp. 46, 47A-C Type Holotype by monotypy is SAM-PCZ7637 from locality 109C, western part of NibelaPeninsula, KwaZulu, St Lucia Formation, Campanian III. Etymology Named after its geographic occurrence. Description The holotype consists of a large, virtually planispirally coiled half of a whorl, part of anearlier whorl impressed in the matrix of the former on the inner adapical edge, and afragment of an even earlier whorl, found loose in the same block of matrix. Coiling in the spiral section of the shell is extremely loose, forming a low spire with avery wide umbilicus. Ornament consists of numerous, sharp-crested ribs. These are weakon the inner (dorsal) side of the whorl, and strongest on the adapical and abapical parts ofthe whorls. Two
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
