. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 52 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 2. lotrigonia cf. vau (Sharpe). Right valve, xl. broad and thick and directed strongly upwards (dorsally). The umbo is slightly recurved and situated about one-quarter of the shell length posteriorly. The marginal and inner carinae are not developed at the growth stages observed, while the area is ornamented by very faint growth striae. Discussion The Brenton example is closest to /. vau (Sharpe) (Fig. 3), and may well be conspecific; only the poor preserva
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 52 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 2. lotrigonia cf. vau (Sharpe). Right valve, xl. broad and thick and directed strongly upwards (dorsally). The umbo is slightly recurved and situated about one-quarter of the shell length posteriorly. The marginal and inner carinae are not developed at the growth stages observed, while the area is ornamented by very faint growth striae. Discussion The Brenton example is closest to /. vau (Sharpe) (Fig. 3), and may well be conspecific; only the poor preservation of the Brenton specimen prevents the author from uniting them. 'Trigonia' dubia Kitchin (Kitchin 1903) from the Oomia Beds of Kutch, southern India, closely resembles the present form, but differs in having the anterior limbs of the chevrons parallel to the concentric growth lines and not oblique as in /. vau. lotrigonia stowi (Kitchin) (Fig. 4) from the Sundays River Formation differs from /. vau in being more produced both posteriorly and anteriorly, and with a different sculpture pattern on the anterior portion of the flanks. Other South African species of lotrigonia are /. crassitesta van Hoepen (1929: 7, pi. 2 (figs 4-5), pi. 3 (figs 1-2)) (of which /. inconstans van Hoepen is a probable synonym) and /. haughtoni Rennie (1936: 340, pi. 41 (figs 1-4)), but none is Hable to be confused with the present 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
