. Text-fig. 17. Podoclavella kottae Suggested stages in its evolution from A, the unmodified form illustrated by Clavelina, through B, the modified form illustrated by Podoclavella cylindrica to C, P. kottae. Abdomen. The abdomen lies within the stalk, occupying the whole length. It is much narrower than the thorax, except at the lower end which is enlarged and accommodates the stomach and intestinal loop. Gut. The oesophageal mouth is at the postero-dorsal corner of the branchial sac and lies within the anterior one-third of the thorax. From there the oesophagus (oe.) passes back behind
. Text-fig. 17. Podoclavella kottae Suggested stages in its evolution from A, the unmodified form illustrated by Clavelina, through B, the modified form illustrated by Podoclavella cylindrica to C, P. kottae. Abdomen. The abdomen lies within the stalk, occupying the whole length. It is much narrower than the thorax, except at the lower end which is enlarged and accommodates the stomach and intestinal loop. Gut. The oesophageal mouth is at the postero-dorsal corner of the branchial sac and lies within the anterior one-third of the thorax. From there the oesophagus (oe.) passes back behind the postero- ventral border of the branchial sac and into the stalk, within which it runs down to the basal swelling. The stomach (st.) is ovoid and has smooth walls. Behind it is a short conical post-stomach and a short horizontal intestine (?) not clearly marked off from the rectum. The rectum is wide at its lower end but narrows as it passes up within the stalk. In both stalk and thorax it lies close to the oesophagus. The anus (a.) is situated to the left of the oesophageal mouth and is small and simple without lobes. Gonads. Neither ovary nor testis was present in any of the zooids. Remarks. This species most resembles P. detorta Sluiter, but is distinguished as shown in Table 21. 9-2
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