ASCIDIANS OF THE PHILIPPINES — VAN NAME. 



131 





basal stolon which is also sheathed in tough horny test. The largest 

 zooid measures 70 mm. high and 10 mm. in greatest width, inclusive 

 of its covering of test and pedicel, but only 45 mm. high when re- 

 moved from the test in the preserved partially contracted condition. 

 The other zooids of the specimen are considerably smaller though 

 apparently equally mature. Color of the mantle of 

 the zooids deep purple, irregularly marked on the /;. 

 anterior part with an area of very bright lemon ,.■" 

 yellow, these colors being contained in round or 

 oval pigment cells in the mantle and some of the 

 internal tissues. 



Zooids having the thorax rather wide; the abdo- 

 men is narrow and more elongated and connected 

 with the thorax by a long contracted portion or 

 neck. Apertures often only slightly prominent, 

 near together ; the branchial termi- 

 nal, 6-lobed; the atrial on a very 

 short forwardly or somewhat dor- 

 sally directed tube, also more or 

 less distinctly lobed, at least in 

 some individuals. A stout vascu- 

 lar process at the posterior end of 

 the abdomen extends down through 

 the pedicel and connects the zooid 

 with the common stolon. 



Musculature of mantle well de- j \/ 

 veloped, comprising a very varia- NQ>^ 

 ble number of fairly stout, chiefly 

 longitudinal bands underlaid by 

 slender closely placed transverse 

 •muscles on the thorax, but on the 

 posterior parts of the body only 

 longitudinal muscles of a more 

 diffuse character are visible. 



Tentacles numerous, of several 

 sizes, the small ones inserted nearer 

 the branchial aperture than the 

 larger ones. 



Dorsal languets arising from the median dorsal vessel itself, though 

 to the left of the middle line of the same. Their bases are continu- 

 ous with membranes borne on the transverse vessels of the sac. 



Stigmata in about 25 rows, with at least 40 in a row on each side 

 (in large zooids probably considerably more). Transverse vessels 

 provided with a rather broad membrane along the side toward the 



V) 



fir. 





Figs. 85-87. — Clavelina molluccensis 

 (Sluiter). 85, Diagram of part of a 

 colony based on specimens from 

 Station D5401. One-half natural 

 size. 86, Colony with basal parts of 

 zooids united. x 1.25. 87, Zooid. 

 X 3. 



