. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 394 ANNALS OF THE SOUTH AFRICAN MUSEUM Septifer bilocularis (Linn.), Odhner, 1917, p. 18, figs. 1,2; Prashad, 1932, p. 69, pi. 2, figs. 21-24 (references); Lamy, 1936, p. 240 (references); van Bruggen, 1952, p. 13; Day & Morgans, 1956, p- 3°75 Macnae & Kalk, 1958, pp. 34, 36, 129. Modiola subtriangularis Turton, 1932, p. 228, pi. 59, no. 1592 (= juv.). Fossil: Post Pliocene, Inhambane (Cox, 1939); Pleistocene, Durban (Geol. Surv. S. Afr.). Off Umkomaas (Natal), 40 fathoms, several juv. valves
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 394 ANNALS OF THE SOUTH AFRICAN MUSEUM Septifer bilocularis (Linn.), Odhner, 1917, p. 18, figs. 1,2; Prashad, 1932, p. 69, pi. 2, figs. 21-24 (references); Lamy, 1936, p. 240 (references); van Bruggen, 1952, p. 13; Day & Morgans, 1956, p- 3°75 Macnae & Kalk, 1958, pp. 34, 36, 129. Modiola subtriangularis Turton, 1932, p. 228, pi. 59, no. 1592 (= juv.). Fossil: Post Pliocene, Inhambane (Cox, 1939); Pleistocene, Durban (Geol. Surv. S. Afr.). Off Umkomaas (Natal), 40 fathoms, several juv. valves 4-7 mm.; off O'Neil Peak (Zululand) 55 fathoms, 1 juv. valve (S. Afr. Mus. coll.) Jeffrey's Bay (dead) (van Bruggen); Port Alfred (dead) (Turton). Living: Port Elizabeth (S. Afr. Mus. R. Kilburn coll.); Durban and Umpangazi (); Delagoa Bay (); Inhambane ().. S->S>nV Fig. 7. a, b, Septifer bilocularis (Linn.), hinge of left valve of juvenile (total length 5 mm.) and of adult, c, Adipicola pelagica (Forbes, Woodward). Distribution. Red Sea, Madagascar, Indo-Pacific. Remarks. Turton's photo of the interior of no. 1592 shows distinctly the internal shelf not retouched (as is the hinge-line). Specimens occur in which the margin of the septum is evenly curved, others in which there is a slight notch (cf. Odhner, fig. 2 b, c). Gen. Brachidontes Swainson (emend. Brachyodontes Agassiz, Brachydontes Gray). Stephenson (1947, pp. 267, 268) mentioned a small purplish-black mussel common in Natal and referred to in previous papers as variabilis and as capensis. He said (p. 268) that '. . two forms are figured by Krauss . . , and it is very difficult to make out from the figures which of them applies to the Natal species — there is little difference between them in any case' [italics mine]. He identified the Natal specimens with the figure of variabilis, whereas Tomlin preferred to identify them with the capensis figure. Surely (pace Stephenson and Tomlin) Kraus
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