138 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



One zooid very small, the others about 3.5 mm. in length when 

 measured on mantle body. Animals laid with ventral side down. 

 Branchial aperture terminal and 6-lobed, atrial aperture situated 

 near middle of body and also 6-lobed ( ? ) . Both siphons short. Test 

 very thin, quite transparent; mantle and wall of stolon pigmented 

 heavily in purplish brown. A number of transverse muscles on right 

 side of body, on left side only about 25 transverse oblique muscles are 

 in dorsal half of body anterior to atrial siphon, about 10 just posterior 

 to atrial siphon. Stigmatal rows 17, about 8 stigmatal rows in area 

 posterior to anterior margin of intestinal loop. Inner longitudinal 

 vessels approximately 20 on each side; generally a single stigma in 

 each interval between longitudinal vessels. Very small papillae (fig. 

 49c) at crossing points between longitudinal and transverse vessels. 

 Tentacles about 30, larger and smaller ones discernible. Ciliated 

 groove a longitudinal slit. Dorsal languets very prominent, nearly 

 one dozen. Stomach oval in outline, both hind stomach and middle 

 intestine distinctly defined. Second intestinal loop very deep, axis 

 passes through esophageal region. Anterior margin of intestinal loop 

 located at level slightly posterior to base of atrial siphon. No gonads 

 found. 



Family Ascidiidae 



64. Asciflia sydneiensis samea (Oka) 



FiGITKE 50 



Ascidia samca Oka, 1935, p. 461, figs. 31-32. 



Ascidia sydneiensis samea Tokioka, 1953a, p. 226, pi. 34, figs. 6-10; pi. 35, figs. 

 1-10 ; pi. 36, figs. 1-10. 



MATERIAL EXAMINED 



Philippine Islands : Off Jolo Island ; Alhatross sta. 5558. One specimen 

 (USNM 11744). 



Description. — A single specimen from the Philippine waters was 

 examined. It is 65 mm. long by 31 mm. wide, fairly flattened laterally 

 and attached to the substratum by the whole left side. 



Branchial siphon terminal, posterior base of atrial siphon situated 

 approximately at middle of body; both siphons moderate in length. 

 Test rather hard, gelatinous, pale grayish yellow. Surface smooth, 

 carries no foreign matter. On each side of the base of branchial si- 

 plion are 10-20 short longitudinal muscles, but most parts of right side 

 of body are provided with only transverse muscles; all are short, con- 

 fined to area along periphery of body, although some vessels connect 

 edges of transverse muscles across central muscleless area. Branchial 

 aperture 7-lobed, atrial aperture 6-lobed, all lobes pectinated. 



On each side of branchial sac 50-60 inner longitudinal vessels ; trans- 

 verse vessels about 150, arranged in order — thick thin thin thin me- 

 dium thin thin thin thick— ; papillae at crossing points between longi- 



