THE PERIDINIALES OF PLYMOUTH SOUND. 1$9 
stages of Gymnodinium and Spirodinium being closely related to 
those of Oxyrrhis. Oxyrrhis marina occurs sparingly in the water 
samples, but is to be found in great abundance in cultures in the 
laboratory in which it thrives with the greatest ease. In cultures 
of Nitzschia clostervum especially it flourishes in enormous numbers, 
the body being full of this diatom on which it feeds. 
LITERATURE. 
1882. Bercu, R. 8. “ Der Organismus der Cilio-flagellaten.”” Morph. 
Jahrb., Bd. 7. 
1906-8. Byerave, W. “ Report on the Plankton of the English Channel 
in 1906.” M. B. A. International Fisheries Investigations, 
1906-8, Cd. 4641. 
1897. Cieve, P. T. “ Plankton Researches in 1887.” Kongl. Svensk. 
Vetensk. Akademiens Handlingar, Bd. 32, No. 7. 
1900. —— “ The Plankton of the North Sea, English Channel and the 
Skagerak in 1899.” Jbid., Bd. 32, No. 2. 
1906. Docret, V. “ Beitrage zur Kenntnis der Peridineen.” Mitt. 
aus der Zool., Station Neapel, 18 Bd. 
1903a. Goucu, L. “ Plankton, English Channel, February, May, August, 
and November, 1903 and 1904.” Bull. d. Rés. acq. pend. 1. c. 
périod pub. p. 1. Conseil International pour VExploration de 
la Mer. 5 
19036. —— “ Report on the Plankton of the English Channel in 1903.” 
M.B.A. International Fisheries Investigations, Cd. 2670. 
1905. —— Cd. 3837. 
1912. Gran, H. H. “ The Plankton Production of the North European 
Waters in the Spring of 1912.” Bull. Planktonique, 1912. 
1907-14. Herpman, W. A. and Scott, A. “ An Intensive Study of the 
Marine Plankton around the South End of the Isle of Man.” 
Parts I-VIII. Reports for 1907-14 of the Lancashire Sea 
Fisheries Laboratory. 
1912. Kuess, G. “ Ueber Flagellaten und Algen—ihnliche Perideen.” 
Verhandlungen der Naturhistorisch-medizinischen Vereines zu 
Heidelberg, N.F. Bd. 11, July, 1912. 
1908. Lonmann, H. “ Untersuchungen zur Feststellung des Vollstin- 
digen Gehaltes des Meeres an Plankton.” Wissenschaftliche 
Meeresunterserchungen h.v.d. komm. z. wiss. unters. d. deutschen 
Meere in Kiel, 1908. 
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