. The Biological bulletin. Biology; Zoology; Marine biology. DEVELOPMENT IN A MARINE SNAIL 457 Table I. Nucella crassilabrum. Percentage of viable embryos and nurse-eggs in three different capsules. Capsule size (mm) Viable embryos and percentage 406 342 397 32 () 24 () 34 () ingested eggs are visible as distinct bulges in the body wall (Fig. 4b) and will spill out intact from an embryo opened during the feeding period. In the succeeding stages (Figs. 4c, d) and intracapsular veliger is gradually developed; by then, the embryos show the appearance of the shell and foot and
. The Biological bulletin. Biology; Zoology; Marine biology. DEVELOPMENT IN A MARINE SNAIL 457 Table I. Nucella crassilabrum. Percentage of viable embryos and nurse-eggs in three different capsules. Capsule size (mm) Viable embryos and percentage 406 342 397 32 () 24 () 34 () ingested eggs are visible as distinct bulges in the body wall (Fig. 4b) and will spill out intact from an embryo opened during the feeding period. In the succeeding stages (Figs. 4c, d) and intracapsular veliger is gradually developed; by then, the embryos show the appearance of the shell and foot and the velar lobes are partially expanded. The embryo is now clearly divided into head (anterior to the shell), foot (ventrally), and visceral hump (covered by the shell) ; nurse eggs ingested still obscure details of internal structure (Fig. 4e). The posterior 120- 110- 100- y 90 en < 80H o <z 70- UJ 0_ £Q 50-| 40 30 20 10- y=+. x â n= 108 r= P< X V. 5 6 7 8 9 10 11 12 13 14 CAPSULE SIZE (mm) Figure 3. Ar. crassilabrum. Relationship between number of viable embryos per capsule and capsule 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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