. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 398 SISTER FLORENCE MARIE SCOTT OBSERVATIONS The aplousobranchiate tunicates possess a systemic organization that adapts them particularly well for dissociation into regions. All structures are clearly visible and distinguishable. In its extended condition the animal can be divided easily into branchial and abdominal halves by the quick cut of a micro-knife. The branchial half of the zooid contains the pharynx with its gill clefts, endostyle and oesophageal funnel with a longer or shorter segment of oesophagus, the contiguou
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 398 SISTER FLORENCE MARIE SCOTT OBSERVATIONS The aplousobranchiate tunicates possess a systemic organization that adapts them particularly well for dissociation into regions. All structures are clearly visible and distinguishable. In its extended condition the animal can be divided easily into branchial and abdominal halves by the quick cut of a micro-knife. The branchial half of the zooid contains the pharynx with its gill clefts, endostyle and oesophageal funnel with a longer or shorter segment of oesophagus, the contiguous. FIGURES 1 and 2. Composite mass of three half zooids at time of combination. FIGURE 3. Section of composite in the cavity of the host tunic showing the plug of tunic that holds the mass intact. FIGURE 4. The normal zooid at the stage used for the combination. (About 90 X.) abd., abdominal fragment; Bi and B2, branchial fragments; br. bs., branchial basket; m-int, mid intestine; oes., oesophagus; oes. fun., oesophageal funnel; p-st, post-stomach; ph., pharynx ; rec., rectum ; St., stomach. walls of peripharyngeal cavity, both siphons, the neural complex of ganglion and nerves, a piece of the rectal segment of the intestine at the base of the atrial cloaca, and the epidermal mantle. The abdominal half contains the remaining portion of the oesophagus, the stomach, post-stomach, mid-intestine, intestine, epicardium, pericardium and enclosed heart, body cells and enveloping epidermis (Fig. 4 i. The fact that different lengths of oesophagus may be attached to both halves constitutes the only variable in tissue content in the triple combinations. It introduces no impediment to the process of reconstitution save insofar as it augments the amount of digestive tract and increases the possibility of providing the reaggregate with a second Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology