. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO KNOWLEDGE OF MARINE MOLLUSCA 139 Remarks. At first sight the sculpturing suggests a young scitecostata, but the protoconch is smaller and the shell narrower. Bela alma Thiele Fig. 21 a 1925. Thiele. D. Tiefsee Exp., xvii, p. 227, pi. 37 (25), fig. 13. Aperture 1 \ in spire. Protoconch 2 whorls, smooth, last half whorl with median spiral lira. Postnatal whorls 4. Axial ribs slightly oblique below sulcus, c. 10 (obscure) on 1st whorl, 12 on 2nd, 15-16 on last whorl; crossed by spi
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO KNOWLEDGE OF MARINE MOLLUSCA 139 Remarks. At first sight the sculpturing suggests a young scitecostata, but the protoconch is smaller and the shell narrower. Bela alma Thiele Fig. 21 a 1925. Thiele. D. Tiefsee Exp., xvii, p. 227, pi. 37 (25), fig. 13. Aperture 1 \ in spire. Protoconch 2 whorls, smooth, last half whorl with median spiral lira. Postnatal whorls 4. Axial ribs slightly oblique below sulcus, c. 10 (obscure) on 1st whorl, 12 on 2nd, 15-16 on last whorl; crossed by spiral lirae on each whorl, feeble knobs at intersections, on body whorl an additional lira at top of base with small knobs, below which the ribs cease; 9-10 fine additional lirae on base. Growth-lines obscure. Sulcus not concave, not crossed by the ribs, no cingulum. Lip sinus deep, adjoining suture. 7x2-5 mm. Pale brown. 350 26' S., 200 56' E., depth not recorded (Thiele). Off Illovo River (Natal), 27-30 fathoms, one; off Tugela River (Zulu- land), 65-80 fathoms, two (S. Afr. Mus. A8712, A8713, Coll.). Remarks. Thiele does not mention the actual number of spiral lirae and axial ribs; his figure shows 4 noduliferous lirae on body whorl. In spite of this the present specimens, which agree in dimensions, may be provisionally referred to his Fig. ai. a. Bela alma Thiele, with protoconch. b. B. anna Thiele. c. B. bella n. sp. d. Asthenotoma eva (Thiele). e. Acrobela acus n. sp., with 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
