PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 133 



Stomach situated near middle of abdomen, pyloric end passes to in- 

 testinal region without forming any marked constriction ; hind stom- 

 ach and middle intestine quite obscure. About 20 longitudinal plica- 

 tions seen clearly on surface of stomach. Contents of the stomach 

 and intestine seem to consist of pelagic diatoms. Anus bilobed. Go- 

 nad occupies right side of intestinal loop. Testicular follicles up to 

 30-40, ovary situated near center of gonad and consists of about 3 ova. 

 A number of embryos in various stages of development found among 

 fascicular vessels of colony. 



Order Phlebobranchia: Family Diazonidae 



59. Syndiazona grandis Oka 



Aphanibranchion japoiiicum Oka, 1906a, p. 2.53, pi. 13. 

 "ApJianibranchion japonicum" Tokioka, 1953a, p. 21.5, pi. 27, figs. 4-7. 



MATERIAL EXAMINED 

 Japan : Honshu Island ; off Omai Zaki Light, N. 17° E., 14.5 mi. ; Albatross sta. 

 3730. Three colonies ( U SNM 11776 ) . 



Description. — Three colonies were examined in the "Aphanibran- 

 chion'' state, 75 mm., 55 mm., and 40 mm. high and pale grayish 

 brown. The thorax was missing in all examined zooids. 



Remarks. — Polycltor giganteus Sluiter, 1919, seems to represent 

 an intermediate state between Syndiazona and D'mzona^ but more in- 

 tensive examinations of this species are desirable before the genera 

 Syndiazona and Diazona can be united. 



Family Cionidae 



60. Ciallusta longa Van Name 



Figure 48 

 Ciallusta loncja Van Name, 1918, p. 124, figs. 79-81.— Millar, 1963a, p. 623, figs. 1-3. 



MATERIAL EXAMINED 



Philippine Islands : Between Samar and Leyte ; vicinity of Surigao Strait ; 

 Albatross sta. 5483. Nine specimens (USNM 11738). 



Description. — Nine specimens from the Philippine waters were ex- 

 amined. Animal consists of a cylindrical body proper and an elon- 

 gated peduncle, the posterior end of which attaches the animal to the 

 substratum. Trunk 45 mm.-70 mm. in length, peduncle 28 mm.-75 

 mm. long. Latter may be only half as long as former when short, 

 but it may attain nearly li/^ times the length of trunk. Branchial 

 aperture opens at anteroventral coiTier of trunk and faces ventral side; 

 atrial aperture located near dorsoanterior corner of trunk at level 

 slightly posterior to branchial aperture and opens forwards. Test 

 gelatinous and transparent, but seems to be slightly harder than in 

 Ciona intestinalis ; surface quite smooth and free from any foreign 

 matter. Mantle thin, delicate, and transparent. Dorsal lip of bran- 

 chial aperture markedly developed, overhanging on anterior side of 



