. Fig. D. Epipodial processes in Trochoids. CT = cephalic tentacles, £T = epipodial processes and 0/> = opercula in: (1) Calliostoma modestulum Strebel; (2) Photinastoma taeniata (Wood); (3) Solariella kempi ; (4) Photinula coerulescens (King & Broderip); (5) Falsimargarita iris (Smith); (6) Venustatrochus georgianus , 5. Falsimargarita iris (Smith). Two short and very stout cephalic tentacles. Epipodial tentacles seven pairs, very short and stout and of equal size (Fig. D, 5). Eales (1923, p. 8) described F. gemma (Smith) as being similar but with the epipodial tentacles
. Fig. D. Epipodial processes in Trochoids. CT = cephalic tentacles, £T = epipodial processes and 0/> = opercula in: (1) Calliostoma modestulum Strebel; (2) Photinastoma taeniata (Wood); (3) Solariella kempi ; (4) Photinula coerulescens (King & Broderip); (5) Falsimargarita iris (Smith); (6) Venustatrochus georgianus , 5. Falsimargarita iris (Smith). Two short and very stout cephalic tentacles. Epipodial tentacles seven pairs, very short and stout and of equal size (Fig. D, 5). Eales (1923, p. 8) described F. gemma (Smith) as being similar but with the epipodial tentacles scarcely distinguishable from the lobes of the epipodial fringe. 6. Margarella expansa (Sowerby); also steineni (Strebel), bouveti , M. (Promargarita) tropi- dophoroides Strebel and achilles (Strebel). All with short and stout cephalic tentacles and four pairs of moderately long epipodal tentacles, which increase in size gradually from the front. 7. Margarella antarctica (Lamy). Similar to the typical Margarella series listed above except for five instead of four pairs of epipodial tentacles. Family TROCHIDAE Subfamily Calliostomatinae Genus Calliostoma Swainson, 1840 Type ( Herrmannsen, 1846): Trochus conidus Linn. The Magellanic Calliostomids seem to have more affinity with West American stock than with European typical members. As already mentioned, Calliostoma typically has three pairs of long, slender, epipodial tentacles, whereas the Magellanic modestulum has four. In the latter, also, the central tooth of the radula is narrow with a deep base and the laterals have the cusps on long slender necks. C. platinum Dall, 414 fathoms, California, has four long epipodial tentacles, and C. annulatus Martyn, California, has 'goose-necked' laterals. The New Zealand Venustas Cunningham (G. & P.) has four pairs of short epipodial tentacles, but the central and lateral teeth are more like those of typical Calliostoma. 6-2
Size: 3470px × 1441px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
