PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 145 



ones arranged at level just behind posteriormost branchial sphincter, 

 smaller ones situated more anteriorl}^ Ciliated groove a short trans- 

 verse groove (fig. 53^) located in front of dorsal ganglion, separated 

 by the length of one to two ganglions. Dorsal lamina supported by 

 ribs, its margin serrated. Two laminae along dorsomedian line just 

 behind ciliated groove, roughly for distance of lengtli of branchial 

 siphon. Anterior margin of intestinal loop reaches level of anterior 

 base of atrial siphon. First loop very spacious ; second loop extremely 

 shallow, its axis passes through esophagus, which opens to branchial 

 sac slightly anterior to dorsoposterior corner of body. Two ridges 

 on left side of stomach. Anal margin may be thickened, undulating, 

 or divided into a few lobes in some specimens. 



Remarks. — The present specimens are characterized by their poor 

 musculature on the right side of the mantle body. Numbers of trans- 

 verse and inner longitudinal vessels seem to be more numerous in the 

 present specimens than in specimens, from the Tolvara Islands, 

 described by Tokioka in 1954. In spite of the existence of above- 

 mentioned specialty and differences between the Kongelap specimens 

 and previously described ones, the former may be identified safely as 

 Ascldla cvperta.) because the most important characteristic of the 

 species, the structure of the alimentary system, conforms exactly to 

 that of the present specimens. Vessels in the mantle are found full 

 of yellowish corpuscles, which seems to indicate that these animals 

 might have been reddish orange when they were alive. 



68. Ascidia papillosa, new species 



Figure 54 



HoLOTYPE.— USNM 11732: Japan; Honshu, off Noma Saki S. 86° 

 E., 5.7 mi., 19-20 fath., mud, sand, pebbles, and shells; Albatross sta. 

 3724, May 15, 1900. 



Description. — A flattened specimen 42 mm. long by 17 mm. wide 

 from ofl" Honshu Island, Japan, is described. Animal attached to sub- 

 stratum by entire left side, yellowish brown, surface covered sparsely 

 with mud. Branchial aperture terminal and 8-lobed ; atrial aperture 

 6-lobed, situated near middle of body, its posterior margin just at the 

 middle ; both siphons short. Many small (about 1.5 mm. long) hollow, 

 finger-shaped protuberances over free surface of test, set especially 

 densely around apertures. Eight side of mantle body wholly retic- 

 ulated with musculature, which consists chiefly of longitudinal and 

 transverse muscles in anterior and posterior parts of body, veiy com- 

 plicated musculature in middle of body. 



Inner longitudinal vessels 31 on each side, transverse vessels 125. 

 About 7 stigmata on each plication. Nearly 100 tentacles, smaller, 

 medium, and larger ones differentiated. About 50 smaller tentacles ar- 

 ranged in intervals between larger and medium ones. Ciliated irroove 



