VAN NAME: SIMPLE ASCIDIANS. 
607 
1899). The following notes and references refer only to the two above- 
mentioned forms of this animal which occur in the New England region. 
Var. tenella (Stimpson). 
1838. Ascidia intestinalis Couthouy, Boston 
Journ. Nat. Hist., vol. 2, p. 111. 
1843. Ascidea intestinalis DeKay, Zool. New 
York, Mollusca, p. 259. 
1852. Ascidia tenella Stimpson, Proc. Boston 
Soc. Nat. Hist., vol. 4, p. 228. 
1854. Ascidia tenella Stimpson, Smithsonian 
Contr., vol. 6, p. 20. 
1860. Ascidia tenella Stimpson, Smithsonian 
Check-hst, p. 2. 
1870. Ascidia tenella Binney, Gould's Inverte- 
brata of Massachusetts, ed. 2, p. 24. 
1870. Ascidia tenella Dall, Proc. Boston Soc. 
Nat. Hist., vol. 13, p. 255. 
1870. Ascidia tenella (part) Verrill, Amer. 
Journ. Sci., ser. 2, vol. 49, p. 424. 
1871. Ciona tenella Verrill, Amer. Journ. Sci., 
ser. 3, vol. 1, p. 99, figs. 12, 13. 
1872. Ciona tenella Verrill, Bull. Essex Inst., 
vol. 3, p. 6. 
1872. Ciona tenella (part) Verrill, Amer. Journ. 
Sci., ser. 3, vol. 3, p. 213. 
1873. Ciona tenella Verrill, Amer. Journ. Sci., 
ser. 3, vol. 6, p. 435. 
1873. Ciona tenella (part) Verrill and Smith, Rept. on Invertebrate Animals 
of Vineyard Sound, p. 698. 
1873. Ciona tenella Verrill, Amer. Journ. Sci., ser. 3, vol. 6, p. 440. 
1874. Ciona tenella Verrill, Proc. Amer. Assoc. Adv. Sci., vol. 22, pp. 352, 363. 
1874. Ciona tenella Verrill, Amer. Journ. Sci., ser. 3, vol. 7, pp. 413, 504. 
1880. Ciona tenella Verrill, Amer. Journ. Sci., ser. 3, vol. 20, p. 251. 
1891. Ascidia tenella Herdman, Journ. Linn. Soc. London, Zool., vol. 23, 
p. 599. 
1896. Ciona intestinalis (part) Castle, Bull. Mus. Comp. Zool., vol. 27, no. 7, 
p. 203. 
1901. Ciona tenella Kingsley, Proc. Portland Soc. Nat. Hist., vol. 2, p. 183. 
1901. Ciona tenella Whiteaves, Geol. Survey Canada, publ. no. 722, p. 267. 
1903. Ciona intestinalis (part) Hartmeyer, in Romer and Schaudinn, Fauna 
Arctica, vol. 3, p. 298. 
1909. Ciona intestinalis (part) Hartmeyer, Bronn's Tier-reich, vol. 3, suppl., 
p. 1414. 
Text-flg. 43. — Ciona intes- 
tinalis (Linnaeus) X 2. 
