Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . Fig. 66. A. Suture line of Tonohamites koeneni Casey, 1961. SAS Z1115 at diameter c. 8 mm. x 6. B. Suture line of Toxoceratoides ? haughtoni sp. nov. at diameter c. 8 mm. x 6. C-D. Suture lines of Tonohamites koeneni Casey, 1961. C. SAS Z1115 at diameter c. 15 mm. x 3. D. SAS H71D/19 at diameter c. 16 mm. x 3. 318 ANNALS OF THE SOUTH AFRICAN MUSEUM Description The coiling is toxoceratoid, open with a recurved crozier. The very earlystage of growth is unknown. The whorl section is initially rounded, but becomeslaterall
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . Fig. 66. A. Suture line of Tonohamites koeneni Casey, 1961. SAS Z1115 at diameter c. 8 mm. x 6. B. Suture line of Toxoceratoides ? haughtoni sp. nov. at diameter c. 8 mm. x 6. C-D. Suture lines of Tonohamites koeneni Casey, 1961. C. SAS Z1115 at diameter c. 15 mm. x 3. D. SAS H71D/19 at diameter c. 16 mm. x 3. 318 ANNALS OF THE SOUTH AFRICAN MUSEUM Description The coiling is toxoceratoid, open with a recurved crozier. The very earlystage of growth is unknown. The whorl section is initially rounded, but becomeslaterally compressed as size increases. Ornamentation is best shown by theholotype. At the smallest diameter, 6,1 mm, ornament consists of single, simpleribs, slightly prorsiradiate and separated by interspaces of similar width. At thisstage there are approximately six ribs in a distance equal to the whorl a slightly larger diameter the ribs become increasingly differentiated over theventer. Initially this appears as a mere flattening along the siphonal line, but atla
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
