ASCIDIANS OP THE PHILIPPINES — VAN NAME. 89 



the branchial terminal, the atrial a short distance back on the dorsal 

 side. Test moderately tough and opaque, its substance whitish with 

 a somewhat pearly lining, the outer surface of a brassy yellow color, 

 rough with elevations separated by narrow but sharply defined fur- 

 rows which cross each other in various directions. The elevations are 

 largest and most irregular in form and size on the anterior and 

 antero-dorsal parts of the body, becoming smaller and more numerous 

 and more uniform in size on the posterior parts. Surface free from 

 incrusting material. Largest specimen, 40 mm. long, 16 mm. in 

 dorso-ventral diameter. 



Mantle thick, adherent to the test, its muscular layers forming 

 thick sheets. 



Tentacles few, probably about 16, comprising two sizes or orders. 

 No atrial tentacles found. 



Dorsal tubercle elliptical, its orifice horseshoe shaped (nearly a 

 complete oval) with the open interval forward. 



Dorsal lamina plain-edged in some parts, somewhat notched or 

 denticulate in others. 



Branchial sac with four well-developed folds on each side sepa- 

 rated by broad intervals. Transverse vessels of three or four sizes, 

 not everywhere regularly arranged, the smallest sometimes crossing, 

 sometimes separating stigmata. Internal longitudinal vessels nu- 

 merous on the intervals as well as on the folds. The specimens were 

 not in condition to permit of an accurate count; the following is no 

 more than a rough approximation to the scheme of their distribution : 



Right side: dorsal 10 (22) 9 (22) 9 (20) 7 (14) 5 ventral. 

 Left side: dorsal 4 (2G) 8 (20) 8 (20) 7 (12) 6 ventral. 



These vessels are separated on the intervals between folds by an 

 average of five to seven stigmata. The latter are mostly rather long 

 and narrow. 



Stomach rather elongate, with over 20 not very distinct or regular 

 longitudinal folds in its wall. Intestinal loop rather narrow in an 

 antero-posterior direction; margin of anus irregularly lobed and 

 plicated. 



Gonads rather numerous on each side, especially on the right, long 

 and tubular, always more or less sinuous, and sometimes very irregu- 

 larly curved. Some are divided into two or more branches toward 

 the closed (ventral) end. The dorsal ends of the gonads are directed 

 toward the base of the atrial tube ; on each side of the body the gonads 

 lie nearly parallel to each other and quite close together, covering a 

 considerable part of the side of the body. The ovary in each extends 

 the whole length of the tube and fills all of it except the space occu- 

 pied by the testes, which are rather large, pear-shaped or cleft into 

 two or more lobes. They are rather irregulaly distibuted in the 



