. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FEEDING MECHANISMS OF ANADARA 109 wood (1903). In all three species studied, latero-frontal and aboral cilia are absent. There are no significant differences in the anatomy and histology of the ctenidia among each of the three species in this study and A. trapezia as described by Sullivan (1961). Some slight anatomical and histological differences do occur among the three species investigated. Comparatively the size of the ctenidia is largest in A. cuneata —volume for volume of mantle cavity. There is no appreciable differen
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FEEDING MECHANISMS OF ANADARA 109 wood (1903). In all three species studied, latero-frontal and aboral cilia are absent. There are no significant differences in the anatomy and histology of the ctenidia among each of the three species in this study and A. trapezia as described by Sullivan (1961). Some slight anatomical and histological differences do occur among the three species investigated. Comparatively the size of the ctenidia is largest in A. cuneata —volume for volume of mantle cavity. There is no appreciable difference in the size of the ctenidia in A. antiquata and A. anomala (see Figs. 3E, 4E and 5E). The position, shape and flexure of the demibranchs are very similar in each of the three species. The fine frontal cilia are fewer in number in A. antiquata than in A. cuneata, with A. anomala having an intermediate number. Consequently, there OFC. PRC ~- FIGURE 2. Semi-diagrammatic transverse section of ctenidium, showing the direction of the ciliary currents in Anadara. is a proportionate migration of the lateral cilia from a more peripheral region in A. antiquata to a more central position in A. cuneata. The lateral cilia in A. anomala show more or less an intermediate condition between the other two species (Figs. 3A, 4A, and 5A). The ciliary currents Stenta (1903) and later Atkins (1936) found that, unlike the usual anteriorly directed current along the ventral margin of the ctenidia, the marginal current in Area was directed posteriorly. The tract with posteriorly-directed ciliary cur- rents was also noted by Yonge (1955) and Sullivan (1961) for Anadara senilis and A. trapezia, respectively. The three species of Anadara here studied have also been found to show this peculiarity (Figs. 2, 3E, 4E, and 5E). The dorsal, orally. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i
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