590 RITTER. 



LIST OF THE SPECIES COLLECTED. 



PAGE. 



Cynthia superba n. sp 590 



Cynthia deani n. sp 592 



" macrosiphonus n. sp 597 



" erecta n. sp 598 



" castaneiformis von Drasche 599 



" haustor Stimpson 601 



Styela stimpsoni n. sp 602 



" gibbsii Stimpson 604 



Ascidia koreana Traustedt 604 



Corella willmeriana Herdman 604 



Chelyosoma producta Stimpson 605 



Distoma molle n. sp 605 



" lobata n. sp 606 



Amaroucium californicum Ritter (MS.) 608 



Distaplia occidentalis Ritter (MS.) 609 



DESCRIPTIONS OF SPECIES. 



Cynthia superba n. sp. 



(PL XVIII., Fig. I, PI. XIX., Figs. 16, 17, 18 and 20, and 

 PI. XX., Fig. 19.) 



General Appearance : Body regularly pear-shaped ; the 

 broad end at the base. Attached by the base, but the area of 

 attachment not extending over the entire base. A rather prom- 

 inent knob and numerous short, closely interwoven root-like pro- 

 cesses on this area. Siphons prominent, the branchial bent over 

 so that the orifice looks ventrad ; atrial directed upward. Exter- 

 nal surface of body entirely free from wrinkles or other irregu- 

 larities, but closely set with veiy fine short papillze. Color of 

 the anterior half bright orange red ; the posterior half yellowish 

 white. Length 15 cm.; diameter in thickest part 6.5 cm.; in 

 smallest part 4.5 cm. ; transverse section of bod\' at any level 

 almost a perfect circle. . 



