. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. rsv ec \ i / '. dgl mp » * clb sgl bw Figure 3-6. Photomicrographs of Haminoea callidegenita veligers and juveniles. Age is listed in days (d) for animals cultured at I5°C: (3) veliger, 29 d. scale = 100 ^m; (4) veliger. 1 d hatched (31 d after oviposition). scale = 100 ^m; (5) encapsulated juvenile, 32 d, scale = 100 jim; (6) juvenile, 10 d post- metamorphosis, scale = 300 /jm. Legend: bw-body whorl of shell: clb-cephalic lobe bud: dgl-digestive gland; e-eye: ec-embryonic capsule: f-foof. g-gizzard; Ir-larval retractor musc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. rsv ec \ i / '. dgl mp » * clb sgl bw Figure 3-6. Photomicrographs of Haminoea callidegenita veligers and juveniles. Age is listed in days (d) for animals cultured at I5°C: (3) veliger, 29 d. scale = 100 ^m; (4) veliger. 1 d hatched (31 d after oviposition). scale = 100 ^m; (5) encapsulated juvenile, 32 d, scale = 100 jim; (6) juvenile, 10 d post- metamorphosis, scale = 300 /jm. Legend: bw-body whorl of shell: clb-cephalic lobe bud: dgl-digestive gland; e-eye: ec-embryonic capsule: f-foof. g-gizzard; Ir-larval retractor muscle: m-metapodium: mp-man- tle pigment; o-operculum; p-propodium; rsv-partially resorbed velum; sgl-salivary gland; sh-shell; v-velum. It is possible that in opisthobranch egg masses, the jelly may influence oxygen diffusion so that O: tension is lower in the center of an egg mass than at the periphery, thus slowing the rate of development of the central em- bryos. As H. callidegenita produce thick, cylindrical egg masses, and as the egg string is irregularly deposited in each jelly mass, we thought the distance between embryo and egg mass surface may be influential in determining the rate of development and therefore the hatching stage. The effect of decreasing the jelly thickness around devel- oping embryos was determined by examining the per- cent veligers hatching daily from intact egg masses, masses cut in 2-mm thick slices, and encapsulated em- bryos removed from the mass jelly. Encapsulated em- bryos could be raised successfully without the jelly mass; there was a 100% success rate in hatching of healthy veli-. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
