PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 45 



unlikely that the specimens from tropical waters are identical with A. 

 glabru/n from northern waters. Definite distinction between A, 

 constrictuin and A. gldbnmi might be made when larvae of the present 

 species are found and compared carefully with those of A. gldbrum. 

 Until that time it would be hardly possible to distinguish small col- 

 onies of these two species from each other. The number of stigmata in 

 each row in the present specimen conforms well to that of the type 

 specimens (10) from the Chatham Islands, but is considerably smaller 

 than that of the Philippine specimens (about 15) ; however, this differ- 

 ence seems to fall within the range of intraspecific variation. 



12. ApUdiopsis atnoyense, new speoies 



Figure 13 

 "iAmaroucium var'uibJe (sic) Cliiu, 1934, p. 489, pi. 53, fig. 5. 



HoLOTTPE. — USNM 11529, China : probably vicinity of Amoy ; T. Y. 

 Chen (University of Amoy), sta. 8 (no further data); received 

 October 12, 1932. 



Paratype.— USNM 11530, same data; T. Y. Chen (University of 

 Amoy), sta. 7 (no further data) ; received October 12, 1932. 



Description. — The collection contains two colonies: holotype is 

 somewhat mushroom-shaped (fig. 13«) , the paratype is roughly spheri- 

 cal, with the underside narrow^ed into a short prominence by which 

 the colony was attached to the substratum (figs. IZd^e). The holotype 

 is 17 mm. X 14 mm. in extent ; corona 5-6 mm. in height and peduncu- 

 lar portion 18 mm. in length; the paratype is 18 mm. in diameter and 

 16 mm. in height. 



Test gelatmous, soft but not fragile, translucent, yellowish wliite to 

 grayish brown, containing a small number of fecal pellets. Surface 

 of colony sparsely covered with mud and surface of peduncular portion 

 slightly wrinkled. System of zooid arrangement observable on para- 

 type specimen, which is evidently half of a spherical colony. Two 

 systems found on surface of this specimen (fig. 13<i), large and much 

 smaller ones. Several radial canals issue from central common cloacal 

 aperture and zooids are arranged on both sides of respective canals 

 roughly in two or three rows. Zooids may attain 5 nun. in length, 

 including postabdomen; thorax usually found in an extended state, 

 quite transparent and up to half of entire body length, reaching 2.5 

 mm. in length. Abdomen about two-thirds the length of thorax. 

 Postabdomen short, one-half to two-thirds the length of abdomen. 

 Branchial aperture 6-lobed, atrial aperture situated at level of first 

 transverse vessel or second stigmatal row, small and roundish in out- 

 line. Atrial languet very long, protruding from a position far ante- 

 rior to atrial aperture, its tip simple or bifid. A few delicate longitu- 

 dinal muscles found only on dorsal part of thorax. Stigmatal row^s 12, 

 with 8-12 stigmata in respective rows. Wide space left between endo- 



