ASCIDIANS OF THE PHILIPPINES VAN NAME. 75 



three to five bands; the bands composing these groups diverge more 

 or less at the ventral and dorsal ends of the groups, and do not 

 generally extend across the middorsal line of the body. Needle-like 

 calcareous spicules quite similar to those found in Pyura pallida 

 (Heller) (see p. 77) occur sparingly in some of the tissues of the 

 body, especially in the larger transverse vessels of the branchial sac. 

 Length of body, 50 mm.; of pedicel, 35 mm.: greatest diameter 

 (dorso- ventral) of body, 31 mm.; of pedicel, 13 mm. 



Tentacles large, numerous, and extensively though rather irregu- 

 larly branched, and provided with very well-developed membranes. 

 The small branches end in blunt rounded tips. Largest tentacles, 

 four in number, several times compound ; at least two or three orders 

 of smaller tentacles, also more or less extensively branched and 

 quite regularly arranged according to the usual scheme. 



Dorsal tubercle rather small; orifice C-shaped with inrolled horns; 

 open interval directed obliquely forward and to the right. 



Dorsal lamina broken up into a series of rather long pointed 

 languets placed close together; their bases are wide in a transverse 

 direction. 



Branchial sac with at least 11 folds on the right and 10 on the left 

 side. Additional rudimentary folds may be present in the anterior 

 part of the sac, which is too tangled to admit of satisfactory ex- 

 amination. Folds high in proportion to the width of the intervals 

 between them. Transverse vessels of about three orders are fairly 

 regularly arranged, the smallest crossing the stigmata in some places 

 without interrupting them; in others they divide the stigmata. 

 Stigmata narrow, placed with their long diameter parallel to the 

 body axis; the interstigmatic longitudinal vessels are generally 

 broad and flat, often much exceeding the narrow slit-like stigmata in 

 width. Internal longitudinal vessels generally separated by only 

 four or five stigmata on the intervals between folds. Approximate 

 distribution of the internal longitudinal vessels: 

 d. 2 (20) 2 (23) 2 (26) 3 (24) 2 (21) 3 (IS) 2 (15) 2 (13) 2 (10) 1 (8) 1 v. 



Digestive tract forming a long horizontal loop whose branches lie 

 well apart throughout their length. Stomach elongated and not 

 well differentiated from the other parts of the tract except by bear- 

 ing two large masses of small, short, closely placed, and only slightly 

 branched hepatic tubules on the aspect toward the branchial sac. 

 Rectum rather short, directed dorsally; the margin of its aperture 

 produced into a number of long irregular lobes. 



One elongated gonad on each side. It is thrown into numerous 

 sinuous curves, but has a general antero-posterior direction except 

 that it is turned up dorsally at the posterior end. On the left side 

 the gonad lies within the intestinal loop. Apparently each gonad 



