CIONA INTESTINALIS. 11 



* 



THOMPSON Nat, Hist, Ireland, IV [1856], p. 361 ; [BEONN 

 Thier-Reichs, III, 1 (1861), p. 154; GRUBE Mittheil. iiber 

 St.Malo Meeres-fauna (1868), p. 7, and in Abh. Schles. 

 Gesell. 1868-69 (1869), pp. 104, 125; LANGSWEEET in 

 Ann. Soc. Malac. Belg. Ill (1868), Mem. p. 115; STEPA- 

 NOFF in Bull. Acacl. Imp. Petersb. XIII (1869), col. 209]. 



[Ascidia virescens PENNANT Brit. Zool. ed. 5, IV (1812), 

 p. 99 ; DESMAEEST & LESSDEUE in Journ. de Phys. LXXX 

 (1815), p. 426, pi. i, f. 14.] 



[Ascidia sp. SCHALCK De Ascid. struct. (1814), with plate.] 



[Ciona Ascidia intestinalis FLEMING Philos. Zool. II (1822), 

 p. 512.] 



Ciona intestinahs FLEMING Brit. Anim. [1828], p. 468; 

 [GARNER in Trans. Linn. Soc. Lond. XVII (1835), pi. xxiv, 

 f. 1; FLEMING Brit. Moll. (1837), p. 210, pi. xvi, f. 58; 

 HANCOCK in Ann. Nat, Hist. (4) VI (1870), p. 364; 

 KUPFFER in Arch. f. mikr. Anat, VI (1870), p. 116]. 



[Ascidia ocellata L. AGASSTZ in Proc. Amer. Assoc. II (1850), 

 p. 159.] 



Body elongated, subcylindrical, flaccid, highly con- 

 tractile, the upper parts retractile within the lower, 

 greenish yellow (nearly white when young), attached 

 more or less by the side or diagonally at the lower 

 part. Apertures terminal, approximate, forming snort 

 tubes, their margins bright yellow, with red ocelli 

 (PI. XXI, fig. 4). Test soft, gelatinous, smooth, trans- 

 parent, lax in texture and composed of distinct outer 

 and inner layers. Mantle greenish yellow with strong 

 longitudinal muscular bands which appear through the 

 test. Tentacular filaments numerous, long, and slender. 

 Branchial sac with broad, slightly-curved papillae at 

 the intersections. Oral filaments long. 



Length three or four inches. 



Hob. On stones, at the roots of Alga3, and within 

 old bivalve shells, ranging from between tide-marks to 

 deep water. 



Not uncommon on most parts of the British coast. 

 [Especially abundant in the north (Forbes $ Hanletj}.~\ 



ENGLAND. [Coast of Northumberland and Dogger 

 Bank (Alder, 1865). Harbour, Grwyllyn-vase, Swan- 



