ABsTRAcrThree species of Limnoriu occur together in Southampton Water. Migration began at a water temperature rising through 10°C in L. quaclripunctntn and L. Zignorum and through 15°C in L. tripunctata, Migratory activity followed the water temperature in L. tripunctata but declined in L. Zignorum before the highest tcmpcraturcs were reached. The migratory behavior of L. quadripunctata resembled that of L. tripunctata at one site and that of L. Zignorum at another. Overcrowding as a cause of migration was not supported.Migration was confined to large, sexually mature adults, excluding gravid females. The first migrants were predominantly male, and in L. Zignorum about twice as many malts as females migrated.Reproduction showed a marked increase in the summer, beginning at a water temperature of 10°C in L. quadripunctata and L. lignorum and of. 12°C in L. tripunctata. L. quadripunctutu differed from other species in being the only one in which the avcragc brood size of post-migrants was significantly greater than that of non-migrants, and in which a significant increase in brood size with body size occurred.No seasonal change in brood size was demonstrated in any species. Widely separated developmental stages were frcqucntly found in the same brood. The duration of the egg stage was longer than that of the embryo which in turn exceeded that of the larval stage.
The copepod parasite Mytilicola intestinalis was first described by Steuer (1902) from the gut of Mytilus galloprovincialis (Lam.) in the Gulf of Trieste. Monod & Dollfus in 1932 recorded the same species from M. edulis from Marseilles. In 1939 the parasite was first recorded on the German North Sea coast by Caspers near Cuxhaven, and in 1947 by Ellenby from Blyth, Northumberland. It is now widespread along the English south coast in M. edulis, but the distribution still shows some irregularities that are discussed in this paper.I am grateful to Prof. J. E. G. Raymont for facilities at University College, Southampton, and for the use of a research table at Plymouth; to Mr F. S. Russell, F.R.S., and the staff of the Plymouth Laboratory of the Marine Biological Association for their assistance; and to Dr D. P. Wilson for facilities to collect at Exmouth. Dr H. A. Cole and Mr J. N. R. Grainger have kindly given me information from their papers not yet published. Dr D. J. Crisp and Dr H. G. Stubbings have assisted by sending me several samples of mussels, and I am grateful also for information received from several other friends named in the text.
1. Skrjabinotaenia cricelomydis n.sp. is described from 18 specimens taken from Cricetomys gambianus Waterhouse, near Ibadan, Nigeria.2. Apolytic proglottides are described and also some details of development of the eggs.3. Details of the anatomy are given and their significance in deciding the relationship with other genera and species is discussed.4. The regrouping of a number of species into the genus Skrjabinotaenia is proposed.5. The diagnostic features of the genera Catenotaenia and Skrjabinotaenia are restated.
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