. The Biological bulletin. Biology; Zoology; Marine biology. 456 C. S. GALLARDO 1200- 1000- 10- o 600- 400- 200- y=+ n=109 r= p< t. 8 9 10 11 12 CAPSULE SIZE (mm) Figure 2. N. crassilabrum. Relationship between number of eggs per capsule and capsule size. Counts in three egg capsules of different sizes (Table I) reveal that only to of the total eggs in a capsule are viable. The number of embryos also increases in proportion to capsule size (Fig. 3) ; it varies between 10 and 122. The intracapsular development of N. crassilabrum is of direct type. In viable emb
. The Biological bulletin. Biology; Zoology; Marine biology. 456 C. S. GALLARDO 1200- 1000- 10- o 600- 400- 200- y=+ n=109 r= p< t. 8 9 10 11 12 CAPSULE SIZE (mm) Figure 2. N. crassilabrum. Relationship between number of eggs per capsule and capsule size. Counts in three egg capsules of different sizes (Table I) reveal that only to of the total eggs in a capsule are viable. The number of embryos also increases in proportion to capsule size (Fig. 3) ; it varies between 10 and 122. The intracapsular development of N. crassilabrum is of direct type. In viable embryos it follows the normal spiral pattern of cleavage. On the other hand, atypical cleavage is observed in non-viable nurse eggs which appear very variable in shape. The atypical development of these nurse eggs is finally arrested. The fertile larvae begin ingesting nurse eggs when they attain an early trochophore stage. By then, the mouth, esophagus and body expand to enclose entire nurse eggs as they are pushed down the digestive tract by the cilia lining it. The. 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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