. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 92 ANNALS OF THE SOUTH AFRICAN MUSEUM Genus Tarrantoceras Stephenson, 1955 Type species Tarrantoceras rotatile Stephenson, 1955 1955 Tarrantoceras Stephenson 1969 Sumitomoceras Matsumoto Discussion Tarrantoceras was originally (Stephenson 1955: 59) separated from Eucalyco- ceras on differences in the suture-line. In the emended diagnosis given by Cobban & Scott (1972: 64), this genus comprises moderately large, compressed forms (Fig. 20) in which prominent prorsiradiate flank ribs are ornamented
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 92 ANNALS OF THE SOUTH AFRICAN MUSEUM Genus Tarrantoceras Stephenson, 1955 Type species Tarrantoceras rotatile Stephenson, 1955 1955 Tarrantoceras Stephenson 1969 Sumitomoceras Matsumoto Discussion Tarrantoceras was originally (Stephenson 1955: 59) separated from Eucalyco- ceras on differences in the suture-line. In the emended diagnosis given by Cobban & Scott (1972: 64), this genus comprises moderately large, compressed forms (Fig. 20) in which prominent prorsiradiate flank ribs are ornamented with umbilical, upper and lower ventro-lateral and siphonal tubercles. Of these, the upper ventro-lateral tubercles are the most prominent, rising above the level of the siphonal tubercles. The latter are very weakly developed in the adult growth stages and are finally lost about half-way up the body chamber, while the lower ventro-lateral tubercles are lost at the start of the body Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
