. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 222 ANNALS OF THE SOUTH AFRICAN MUSEUM however, seems to be one in which both species agree. The sculpture separates them: about 12 (13 figured) peripheral processes in henicus, 16 in gilchristi; the 5th whorl in henicus has only the subsutural and supracarinal rows of granules, gilchristi has the space between these also granulate. The basal marginal lira in henicus has 30-35 sharp vaulted scales becoming stronger towards the lip, in gilchristi it has c. 40 low vaulted scales becoming less conspicuo
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 222 ANNALS OF THE SOUTH AFRICAN MUSEUM however, seems to be one in which both species agree. The sculpture separates them: about 12 (13 figured) peripheral processes in henicus, 16 in gilchristi; the 5th whorl in henicus has only the subsutural and supracarinal rows of granules, gilchristi has the space between these also granulate. The basal marginal lira in henicus has 30-35 sharp vaulted scales becoming stronger towards the lip, in gilchristi it has c. 40 low vaulted scales becoming less conspicuous; additional lirae on base 10 in henicus, 6 in gilchristi. On the other hand, gilchristi resembles bathyraphe from Maldive Atoll, 21 o fathoms, in the sutural channel, basal marginal lira without sharp processes, 6 rows of granules on base, and 2 (see Smith's and Sowerby's figures) rows of granules between the peripheral keel and the suture below. But the peripheral keel has only low vaulted scales in bathyraphe in contrast with the sharp processes in Fig. 7. a, Astraea tayloriana (Smith) juv. 9x12 mm. b, c, semidiagrammatic profile of A. tayloriana and A. gilchristi (Sow.) respectively to show true sutures (arrows) and 'false suture' in the former, d, apical view of Astraea sp. (S. Air. Mus. no. A9237) (last process injured near aperture), e, lateral view of Astraea sp. juv., left: diam. 3 mm. (S. Air. Mus. no. A9237), right: diam. 1 mm. (no. A9238)./, g, apical and lateral views of Astraea sp. (no. A9236). h, basal view of Astraea sp. (no. A5217). i, fragment of Astraea sp. (no. A9233), surface sculpture only partially indicated. More abundant material may very likely show that gilchristi should be relegated to synonymy. Smith said there were 9 whorls in bathyraphe, which seems excessive; probably a misprint for 6 (see Smith's figures). Astralium johnsoni Odhner (1923, p. 9, pi. 1, figs. 15-17) from Port Alexander, Angola, 60 fathoms, resembles gilchristi in ha
Size: 2259px × 1106px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
