. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 144 ANNALS OF THE SOUTH AFRICAN MUSEUM Dimensions D Wb Wh WblWh U R D1145a 31,0 9,0(29,0) 9,0(29,0) 1,0 16,0(51,6) 32:34 Z1623b 42,7 13,2(30,9) 12,5(29,2) 1,05 20,5(48,0) 28:28 Z1623a 52,4 17,0(32,4) 12,5(23,8) 1,36 27,0(52,0) 26:26 Z1117 59,0 17,0(28,8) 17,0(28,8) 1,0 31,0(52,5) 38:38 Z1607 60,0 17,0(28,0) 17,7(29,5) 1,04 29,1(48,5) 30:30 Z1120 63,3 19,0(30,0) 19,6(30,9) 0,96 30,5(48,0) 21:21 Z1590 82,8 24,6(29,7) 22,0(26,5) 0,92 48,0(57,9) 28:28 Z730 101,6 25,6(25,1) 23,3(22,9) 1,09 60,0(59,0) 30:3
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 144 ANNALS OF THE SOUTH AFRICAN MUSEUM Dimensions D Wb Wh WblWh U R D1145a 31,0 9,0(29,0) 9,0(29,0) 1,0 16,0(51,6) 32:34 Z1623b 42,7 13,2(30,9) 12,5(29,2) 1,05 20,5(48,0) 28:28 Z1623a 52,4 17,0(32,4) 12,5(23,8) 1,36 27,0(52,0) 26:26 Z1117 59,0 17,0(28,8) 17,0(28,8) 1,0 31,0(52,5) 38:38 Z1607 60,0 17,0(28,0) 17,7(29,5) 1,04 29,1(48,5) 30:30 Z1120 63,3 19,0(30,0) 19,6(30,9) 0,96 30,5(48,0) 21:21 Z1590 82,8 24,6(29,7) 22,0(26,5) 0,92 48,0(57,9) 28:28 Z730 101,6 25,6(25,1) 23,3(22,9) 1,09 60,0(59,0) 30:30 Z1522 112,0 30,0(26,7) 26,0(23,2) 1,15 65,0(58,0) 24:24 D1145C 119,0 — 40,0(33,6) — 55,0(46,2) — Z756 120,0 33,7(28,0) 27,3(22,7) 1,23 71,0(59,0) 33:33 D1145e 124,0 36,0(29,0) 34,0(27,4) 1,05 66,0(53,2) 38:38 Z248 132,0 33,0(25,0) 33,0(25,0) 1,0 73,0(53,0) 29:29. Fig. 6. Peroniceras (Peroniceras) tridorsatum (Schliiter, 1867). External suture of SAS A63. Description Coiling is very evolute, with an umbilical width of the order of 48 to 59 per cent of the diameter, and with the whorls overlapping only slightly. The whorl section is rounded to subrectangular, varying from compressed to depressed, with the greatest costal width at the umbilical tubercle. There is an initial smooth stage, which may persist to a diameter of 9 mm; thereafter umbihcal tubercles connecting to ventrolateral tubercles via weak ribs appear. With increasing diameter all ornament becomes stronger, with promi- nent umbilical bullae situated well away from the umbilical edge on the flanks and connected to rounded or slightly clavate ventrolateral tubercles by promi- nent ribs. The ribs are generally single but occasional bifurcations occur, es-. 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 M
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
