. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO THE KNOWLEDGE OF SOUTH AFRICAN MARINE MOLLUSCA 613 ribs on one whorl alternating with those on whorl above. Shell 8x4 mm. Thiele 15x2-7 mm. Localities: 350 19/ S. 200 12' E., 126 metres (Thiele), 340 3' S. 250 10' E. (St. Francis Bay), 24-34 fathoms, one dead. ( A29766, Pieter Faure collec- tion) . Remarks: This specimen shows my suggestion (1958: 118) that ida was the juvenile of Philbertia capensis to have been incorrect. The two species are clearly differentiated by having t
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO THE KNOWLEDGE OF SOUTH AFRICAN MARINE MOLLUSCA 613 ribs on one whorl alternating with those on whorl above. Shell 8x4 mm. Thiele 15x2-7 mm. Localities: 350 19/ S. 200 12' E., 126 metres (Thiele), 340 3' S. 250 10' E. (St. Francis Bay), 24-34 fathoms, one dead. ( A29766, Pieter Faure collec- tion) . Remarks: This specimen shows my suggestion (1958: 118) that ida was the juvenile of Philbertia capensis to have been incorrect. The two species are clearly differentiated by having two (ida) and three (capensis) spiral keels. Mitromorpha volva Sow., 1892 Mitromorpha hewitti Tomlin, Barnard, 1958: 162. There is little doubt that both hewitti Tomlin, 1921 and striolata Turton, 1932 should be regarded as synonyms of volva Sowerby. Smith (1904: 31) said the typical form of volva 'usually' had 5 lirae on the penultimate whorl; Tomlin said 5-7; the variety later named hewitti has 4; Turton's figure (front view) of striolata shows 7 on the penultimate, 8 on the last whorl, and 12 on the base. The two East London specimens recorded in 1958 (p. 163) have 4 lirae, and 16 on the base; there is also a broken specimen with 4 + 17 lirae. Four Pondoland specimens (ex Dr. Becker) have 4 + 17? 4 + 18, 5 + 15, and 6 -f- 15 lirae. Apart from possible variation in the number of the lirae, the number of visible lirae depends on the variable extent to which one whorl overlaps the preceding whorl; and this is scarcely a satisfactory feature on which to base specific Fig. 8. 'Pleurotoma' curricula 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
