VAN NAME: COMPOUND ASCIDIANS. 379 
1S86. ? Lcptodinum sp., von Drasche, Oester. Polarstat. Jan Mayen Beob.- 
Ergel)., vol. 3, zooL, p. 101. 
1891. Leptodinum albidum + L. luteolum Herdman, Journ. Linn. Soc. 
London, ZooL, vol. 23, p. 631. 
1891. Didemnian roseum Packard, The Labrador Coast, p. 397. 
1892. Leptodinum sp., Herdman, Proc. and Trans. Liverpool Biol. Soc, 
vol. 6, p. 91. 
1894. Leptodinum strudum Gott.schaldt, Jena. Zeitschr., vol. 28, p. 357, 
pi. 24, fig.s. 4a, 4b; pi. 25, fig. 9. 
189G. Didemnum roseum Huitfeldt-Kaas, Norske Nordhavs-Exp., Zool., 
vol. 23, no. 1, p. 6. 
1897. Didemnum roseum Vanhoffen. in Diygalski, Gronland Exp., vol. 2, 
pt. 1, p. 184. 
1901. Leptodinum albidum + L. albidum var. luteolum Kingsley, Proc. 
Portland Soc. Nat. Hist., vol. 2, p. 183. 
1901. Leptodinum albidum + L. albidum var. luteolum ^Yhiteaves, Catalogue 
of marine Invertebrata east. Canada, p. 265. 
1902. Leptodinum albidum Van Name, Trans. Connecticut Acad. Sci., vol. 
11, p. 363, pi. 52, fig. 41. 
1903. Leptodinum roseum Hartmeyer, in Romer and Schaudinn, Fauna 
Arctica, vol. 3, pt. 2, p. 361, pi. 6, figs. 17, 18; pi. 14, fig. 17. 
1906. Leptodinum roseum Redikorzew, in Derjugin, Die murmansche biolo- 
gische Station, Trav. Soc. Nat. St. Petersbourg, vol. 37, p. 155. 
1906. Leptodinum roseum Redikorzew, Trav. Soc. Nat. St. Petersbourg, 
vol. 37, pt. 1, p. 310. 
1907. Leptodinum roseum Redikorzew, Ann. Mus. Zool. Acad. Sci. St. Peters- 
bourg, vol. 11, pp. 150, 151, 153. 
1908. Leptodinum roseum Bjerkan, Tromsoe Mus. Aarsheft., no. 25, pp. 98, 
115. 
1908. Leptodinum roseum Redikorzew, Trav. Soc. Nat. St. Petersbourg, vol. 
39, pp. 21, 36. 
1908. Leptodinum roseum Redikorzew, Mem. Acad. Imp. Sci. St. Petersbourg, 
ser. 8, cl. phys. math., vol. 18, no. 11, p. 52. 
1909. Didemnum structum + D. albidum + D. albidum var. luteolum Hart- 
meyer, Bronn's Tier-reich, vol. 3, suppl., pp. 1449, 1451. 
Not Didemnum roseum delle Chiaje, Mem. Animali senza Vertebre, vol. 3, 
1828. 
Not Leptodinum albidum nor LepAodinum albidum var. luteolum Herdman, 
Report Voyage Challenger, Tunicata, pt. 2, pp. 287 ff., 1886. 
As Sars's (1851) name roseum, by which this species has usually 
been known in Europe, was preoccupied by delle Chiaje (1S28), 
Hartmeyer (1909) adopted Gottschaldt's (1894) name structum 
instead. Leptodinum albidum Verrill (1871) as well as L. luteolum 
Verrill are, however, in the writer's opinion identical with Sars's 
species, and as Verrill's name albidum antedates Gottschaldt's it 
