REPORT ON TIIE TUNICATA OF PLYMOUTH. 68 



Is not Muller's Ascidia gelatina (Zool. Dan., iv, 26, plate 143) 

 also probably a species of Clavelina ? 



1. Clavelina lepadiformis, 0. F. Midler. (PI. II., fig. 1). 



Ascidia lepadiformis, 0. F. Miiller. L. c, p., 54, pi. lxxix, fig. 5. 



— — Bruguiere. L. a, pp. 142, 151, 152 ; pi. lxiii, fig. 10. 



— — Turton. L. c, p. 95. 



Clavelina lepadiformis, Savigny. Tableau systeinatique, p. 174. 



— — Fleming. L. c, p. 202, pi. xvi, fig. 57. 



— — Milve-Ed,wards. L. c, p. 267, pi. i, fig. i; ii. fig. 1. 



— rissoana, Milne-Edwards. L. c, p. 267. 



— lepadiformis, Thompson. Rep. on Fauna of Ireland, Eep. 



Brit. Ass., 1843, p. 264. 



Clavellina — Alder. L. c, p. 108. 



Clavelina — Forbes and Hanley. L. c, p. 26, pi. E, fig. 1. 



— — Dickie. Eep. on the Mar. Zoology of Strangford 



Lough, Brit. Ass. Rep., 1857, p. 105—111. 



— — Mennell. Rep. of Dredging Expedition to Dogger 



Bank and Coasts of Northumberland, Trans. 

 Tyneside Nat. Field Club, 1868, p. 12. 



— — A. M. Norman. Last Rep. on Dredging among 



Shetland Isles, Rep. Brit. Assoc, 1868, p. 303. 



— — Giard. Recherches, 1. c, pp. 613 — 615, pi. xxi, 



figs. 2, 5 ; xxiii, fig. 2. 



Clavelina lepadiformis, Mcintosh. Marine Invertebrates and Fishes 

 of St. Andrews, 1875, p. 54. 



— — Herdman. Fauna of Liverpool Bay, vol. i, 1886, 



p. 296, and Proc. Biol. Soc. Liverpool, vol. iii, 

 1889, p. 245. 



— — Cams. L. c, p. 476. 



Colonies compact, zooids numerous. 



ZooiJs more or less stout, moderately clavate, slightly compressed 

 from side to side, without well-marked external differentiation into 

 thoracic and post-thoracic regions ; average height from a half to 

 three-quarters of an inch. 



Test gelatinous, perfectly hyaline and transparent. 



Thorax one third of the total body-length ; oesophageal region 

 short ; conspicuous opaque bands of a yellow, brown, or white colour 

 mark the position of the dorsal, ventral and anterior peribranchial 

 sinuses. 



