. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Rhizopodal Genera Webbina and Vitriwebbina. 331 affinity towards Nuhecularia^ but not to Webhina in this respect. That Webhina is a genus closely allied to Trocham- mina is evident when a thin section is examined under a high power. Fig. 2 represents a portion of the test of Fiff. 2. Portion of the test of W. clavata more higlily magnitied. X 360. a recent specimen of W. clavata ; and it shows the arenaceous central layer glazed over internally and externally, the outer glazin
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Rhizopodal Genera Webbina and Vitriwebbina. 331 affinity towards Nuhecularia^ but not to Webhina in this respect. That Webhina is a genus closely allied to Trocham- mina is evident when a thin section is examined under a high power. Fig. 2 represents a portion of the test of Fiff. 2. Portion of the test of W. clavata more higlily magnitied. X 360. a recent specimen of W. clavata ; and it shows the arenaceous central layer glazed over internally and externally, the outer glazing being smoother, more evenly laid, and paler in colour than the inner. The median arenaceous layer Fig. Vitriivebbina Icevis (Sollas). Chalk, Chariug, Kfint, X 20. averages about "027 millim, in thickness and the inner and outer layers about "002 millim. each. There is also much chitinous material between the angular sand-grains and spicules, and the outer and inner layers of the shell are composed of the same substance. The grains of sand average •014 millim. in diameter. In the specimens of Vitriwebbina which exhibit the secondary septation before referred to the first segment. 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 London, Taylor and Francis, Ltd
Size: 1514px × 1650px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
