DESCRIPTION OF SPECIES 67 



A row of pointed triangular languets occupies the mid-dorsal line of the branchial sac. The trans- 

 verse rows of stigmata number thirteen to twenty-seven, according to the size of the zooid, and the 

 rows lie in line with the long axis of the stalk. The anterior and posterior rows are shorter than the 

 middle ones, and the shortest rows have less than twenty stigmata, whereas at least sixty are present 

 in the longest. The endostyle (e) is conspicuous and strongly curved. 



Table 21 



P. detorta 



P. kottac 



Number of rows of stigmata 'Apparently 6' (van Name, 19 18) Up to 27 



Lower end of intestinal loop Some distance up from base of At base of stalk 



stalk 



Anus Far anterior to oesophageal Beside oesophageal mouth ; 



mouth; lobed (Sluiter, 1904) without lobes 



as 



Text-fig. 17. Podoclavella kottae sp.n. 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 



