Vou. 2] Ritter—The Pelagic Tunicata. 105 
structure and affinities, an excellent review of the litera- 
ture. Author’s interpretation of reproduction in Salpa: 
‘“The parent and offspring are not dissimilar, but the indi- 
vidual is composed of two zooids.’’ 
1851. Remarks upon Appendicularia and Doliolum, two genera of 
the Tunicata. Ibid., pp. 595-605. 
Jones, T. Rupert. 
1848. Tunicata. Cyclopedia of Anatomy and Physiology. Vol. IV, 
Part II, pp. 1185-1243. 
Keferstein, W., und Ernst Ehlers. 
1861. Zoologische Betrage gesammelt in Winter 1859-60, in Neapel 
und Messina. III Ueber die Anatomie und Entwicklung 
von Doliolum, pp. 56-71, Pls. IX, X, XI. Important. IV 
Bemerkungen tiber die Anatomie von Pyrosoma, pp. 72-77 
el pexXaliie 
Krohn, A. 
1846. Observations sur le génération et le développement des Bi- 
phores (Salpa). Ann. d. sci. Nat., ser. 3 (Zool.), t. VI, pp. 
110-131. First important confirmation and extension of 
Chamisso’s discovery of ‘‘Alternation of generations’’; 
sexual elements in proles gregata, and budding in proles soli- 
taria observed; idenification of the two generations belong- 
ing to the same species first made for several species. 
1852. Ueber die Gattung Doliolum und ihre Arten. Archiv. fiir Natur- 
geschichte, pp. 53-65, Pl. II. The tailed larva observed; 
alternation of generation in this genus first recognized, and 
this compared with the similar reproductive process in 
Salpa. The simple alternation of a sexual with an asexual 
generation, as in Salpa, assumed. D. miilleri, D. nordmanni 
and D. troschelwi described as new. 
Lahille, F. 
1890. Contributions a 1’étude anatomique et taxonomique des Tuni- 
ciers. Thésés, Tolouse. 
Lesson, R. P. 
1830. Voyage autour du monde, exécuté per ordre du roi, sur la cor- 
vette de S.M. la Coquille, 1822-25. Zodlogie, t. II, Paris, 
1830, pp. 256-279. 
Lesueur. 
1815. Mémoire sur quelques nouvelles espéces d’animaux mollusques 
et radiaires receuillis dans la Mediterranée prés de Nice. 
Bull. d. Science de la Société Philom., Paris. T. 3, p. 281, 
BIR Vee tioee ce: 
1815. Mémoire sur l’organisation des Pyrosomes, et sur la place qu’ils 
semblent devoir occuper dans une classification naturelle. 
Bull. d. Science. de la Société Philom., Paris, 1815, p. 70, Pl. 
I, figs. 1-15. Also, Journ. de Phys. de Chim., et d’hist. nat., 
T. LXXX, p. 413. 
