. Dansk botanisk arkiv. Plants; Plants -- Denmark. 3 Dansk Botanisk Arkiv, Bd. 2, Nr. 4. Leram.; P. pillula (Ostf.) Lemm.; P. Manginii nov. nom. (syn. Diplop- salis minima Mangin, non Perid. minimum Schilling); P. saecularis (Murr, et Whitt.) nob. (syn. Dipl. saecularis Murray and Whitting); P. Borgei (Lemm.) Lemm. (syn. Peridiniopsis Borgei Lemmermann); P. Cunningtonii (Lemm.) Lemm. (syn. Peridiniopsis C. Lemm.). The P. assymetricum was found sparingly in the sample. P. conicum (Gran) Ostenfeld et Schmidt, 1. c, 1901, p. 174. Specimens agreeing well with the figures of P. conicum (Gran, Rep.
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 3 Dansk Botanisk Arkiv, Bd. 2, Nr. 4. Leram.; P. pillula (Ostf.) Lemm.; P. Manginii nov. nom. (syn. Diplop- salis minima Mangin, non Perid. minimum Schilling); P. saecularis (Murr, et Whitt.) nob. (syn. Dipl. saecularis Murray and Whitting); P. Borgei (Lemm.) Lemm. (syn. Peridiniopsis Borgei Lemmermann); P. Cunningtonii (Lemm.) Lemm. (syn. Peridiniopsis C. Lemm.). The P. assymetricum was found sparingly in the sample. P. conicum (Gran) Ostenfeld et Schmidt, 1. c, 1901, p. 174. Specimens agreeing well with the figures of P. conicum (Gran, Rep. Norweg. Fisheries and Mar. Invest., vol. 2, No. 5, 1902, fig. 14} were found in the sample. P. crassipes Kofoid, Univ. Calif. Publ. Zoology, III, 1907, p. 309, tab. 31, figs. 46-47. I have taken one of Dr. Justesens drawings as belonging to P. crassipes. P. depressum Bailey, Smithsonian Contrib. to Knowledge, VII, Washington, 1855, p. 12, figs. 13-14. Seems to be common in the Boeton Strait. Dr. Justesen has made several drawings of it and I have found it in the sample. Probably several forms are included under this name. P. divergens Ehbg.; Paulsen, Medd. Komm. f. Havundersøg., Ser. Plankton, I, No. 5, 1907, p. 16, fig. 23; P. speciosum Jørgensen, 1. c, 1912, p. 8. Both drawn by Dr. Justesen and found by me in the sample. Seems to be common in the Boeton Strait. P. grande Kofoid, Bull. Mus. comparat. Zoology at Harvard College, vol. 50, No. 6, 1907, p. 174, pi. 5, fig. 28. A drawing by Dr. Justesen seems to agree well with Kofoid's figure. P. oblongum (Aurivillius) Cleve, K. Svenska Vetensk. Akad. Handl., Bd. 32, No. 8, 1900, p. 20. I agree with Jørgensen (1. c, 1912, p. 6) in keeping P. oblongum distinct from P. oceanicum. The drawing made by Dr. Justesen was very like that by Schutt, Peridineen d. Plankton Exp., 1895, PI. 13, fig. 44. P. oceanicum Vanhöffen, Grönl. Exp. d. Ges. für Erdkunde, Berlin, Bd. II, Teil 1, 1897, tab. 5, fig. 2; P. elegans Cleve, K. Svenska Vet
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