ASCIDIANS OF THE PHILIPPINES — VAN NAME. 



125 



in the alcoholic specimens, moderately tough, with a smooth clean 

 surface. Pedicel of substance similar to the test covering the body 

 proper. 



Mantle musculature slight, the sphincters of the apertures weak, 

 being composed of narrow bands. The most conspicuous body 

 muscles are short widely spaced transverse bands crossing the. mid- 

 dorsal and mid- ventral regions (about 20 to 30 on each region) but 

 ending abruptly without extending far onto the sides of the body. 

 In this respect it differs greatly from the genus Ciona, which has 

 strong longitudinal body muscles ar- 

 ranged in \vide bands. 



Tentacles of several sizes, not very 

 regularly arranged. A total of about 

 40 were counted in one of the smaller 







J 



■9 









I 



\ 





specimens. 



Dorsal tubercle large but not prom- 

 inent, its orifice irregularly C-shaped 

 with the open interval to the right or 

 somewhat forward. In the largest 

 specimen the horns are somewhat in- 

 rolled. 



Median dorsal vessel broad and flat, 

 the dorsal lamina represented by a 

 series of narrow, sharp-pointed lan- 

 guets inserted with the broad diameter 

 of the base transverse to the median 

 dorsal vessel. 



In some parts of the sac three or 

 four orders of transverse vessels quite 

 regularly arranged can be recognized ; 

 in other parts the regularity is less. 

 The smallest of the vessels usually 

 cross without interrupting the stig- 

 mata and are interrupted and incom- 

 plete at many points. Well-developed though very slender internal 

 longitudinal vessels are present and are separated by the width of 

 only two or three stigmata. The latter are of rather short, broad 

 oblong form in most parts of the sac, and are separated by rather 

 wide interstigmatic vessels. The internal longitudinal vessels are 

 borne on the ends of tapering supporting papillae which rise from 

 the transverse vessels (even from the small incomplete ones, those 

 parts of the vessel which give rise to supporting papillae being 

 usually well developed even when intermediate parts are atrophied). 

 No papillae are borne on the internal longitudinal vessels. 



iffti 



81 



Figs. 79-81. — Ctallusia longa, new 

 srEciES. 79, Left side of dody. 

 One-half natural size. 80, Dor- 

 sal TUBERCLE AND PART OF DORSAL 



lamina. X 9. 81, Part of 



BRANCHIAL SAC. X 21. 



