116 BULLETIN" 100, UNITED STATES NATIONAL MUSEUM. 



the name pcllucidum will have priority. The settlement of this 

 question will probably have to wait until future collecting shall 

 determine whether one or two species of this genus occur in Chinese 

 waters. 



Family PHALLUSIIDAE Traustedt, 1882. 



[=ASCIDIIDAE Authors.] 

 Genus PHALLUSIA Savigny, 1816. [=ASCIDIA Authors.] 



PRALLUSIA DEPRESSIUSCULA (Heller), 1878. 



Plate 27, figs. 10-13. 



1S7S. Ascidia depressiuscula Helleb, Sitzungsber. d. k. Akad. Wiss. Wien, 



vol. 77, p. 87, pi. 1, fig. 7. 

 1891. Ascidia depressiuscula Herdman, Jpurn. Linn. Soc. London, Zool., 



vol. 23. p. 594. 

 1906. Ascidia depressiuscula Hebdman, Rep. Ceylon Pearl Oyster Fisheries, 



pt. 5, suppl. rfep. No. 39, p. 305, pi. 2, figs. 10-22. 

 1909. Phallusia depressiuscula IIaktmeyer, Bronn's Tier-reich, vol. 3, 



suppl., p. 1402. 



Body usually much flattened from side to side, attached by an area 

 on the posterior part of the left side or by a large part of that side, 

 but the area of attachment is subject to some variation in position. 

 Body as seen from the side generally more or less elongate, some- 

 times nearly oval in outline, but more often narrowed anteriorly, 

 or tapering in such a manner that the branchial aperture appears to 

 be borne on a rather long tube or siphon, though in reality this is 

 the narrowed anterior part of the branchial sac. Branchial aper- 

 ture terminal; atrial aperture on a tube of varying length arising a 

 considerable distance back on the dorsal border of the body, and 

 pointing dorsally or more or less forward, occasionally almost di- 

 rectly forward and parallel to the narrow anterior part of the body. 



Dimensions of largest specimens: 



No. 114 (Cat. No. 6025. U.S.N.M.), Station ,D5555, length 110 rum., dorso- 



ventral diameter 47 mm. 

 No. 154 (Cat. No. 6021, U.S.N.M.), Endeavor Point. Length 102 mm., 

 dorso-ventral diameter, 52 mm.; thickness from side to side 

 about 14 mm. 



Test usually moderately thick on most parts of the body, of a 

 cartilaginous appearance and rather firm consistency. Sometimes it 

 is almost colorless and fairly clear with a glassy luster, in other indi- 

 viduals suffused with a smoky brown color over most of the body 

 or near the apertures only. The test is easily torn or broken. Its 

 external surface is usually fairly smooth and free from foreign mat- 

 ter; it may be very even, or have a few irregular furrows or depres- 

 sions and elevations. 



