ASCIDIANS OF THE PHILIPPINES — VAN NAME. 



69 



There are about 20 tentacles of the first and second orders, with a 

 few additional third-order tentacles. The large ones are two or three 

 times compound; small branches few and rather slender, with taper- 

 ing ends. Membranes borne on tentacles rather narrow. 



Dorsal tubercle- (seen in one specimen only) spindle shaped, with 

 a large longitudinally elongated oval orifice. 



Dorsal lamina plain-edged, at least on the anterior part. 



Only six branchial folds were certainly demonstrated on each 

 side, but owing to the poor preservation of the sac there may be 

 seven (the number given by Sluiter for this species). On most parts 

 of the sac at least, there is a single large infundibulum on each fold 





nnnTiv ^ 



4 



Pigs. 1-5. — Molgula viteea Sluiter. 1, Left and right sides of body, x 2. 2. Net- 

 work OF MUSCLE BANDS ON MANTLE. X 2. 3, TENTACLE. X 15. 4, PART OF 

 BRANCHIAL SAC. X 20. 5, LEFT GONAD AND OUTLINE OF INTESTINAL LOOP. SEEN FROM 

 SIDE NEXT TO BRANCHIAL SAC. X 10. (FOR LETTERING SEE PAGE 68.) 



in the space between adjacent transverse vessels. It would perhaps 

 better describe the condition to say that the folds each consist of a 

 row of such infundibula. Stigmata long and narrow, arranged on 

 these infundibula in quite regular spirals. Sometimes at least they 

 form double spirals approaching the condition found in the genus 

 Eugyra, but less regular, and occasionally interrupted. Some of the 

 infundibula show a tendency to divide into an anterior and a pos- 

 terior apex. On the intervals between folds the stigmata are also 

 long and often form curves, hooks, and occasionally incipient spirals. 

 A few delicate radial vessels cross the stigmata. Internal longitu- 

 dinal vessels rather broad and quite thin. They are confined to the 

 folds; eight or nine on a fold were counted in some cases, but this 

 number is probably exceeded on the higher folds. 



