ABSTRACT
The common lugworm and its coiled castings of sand are familiar objects on almost all the sandy and muddy shores of Western Europe, but the exact geographical range of the species is doubtful. It has been recorded from the shores of North Siberia, Spitzbergen, Iceland, and Greenland (Wirén, 1883; Levinsen, 1883). On the north-east coast of America it has been found from the Bay of Fundy to Long Island (Verrill, 1881). On both sides of the Atlantic, latitude 40° N. marks approximately the southern limit of Arenicola marina. South of this it is replaced in the Mediterranean by A. Claparèdii, Lev., and by A. cristata, Stimps., the latter also ranging on the west side of the Atlantic from Cape May (N. J.) to the Caribbean Sea. Its reputed occurrence on the north coast of Alaska (Murdoch1), at Vancouver Island (Marenzeller, 1887), Coquimbo, and South Africa requires confirmation.
‘ Proc. U. S, Nat. Museum,’ Washington, vol. vii, 1884, p. 522.
Seethe curious account of the ravages of Corophium longicorne, by d’Orbigny, ‘Journal de Physique,’ 1821.
Selenka, ‘Die Sipunculiden,’ 1883, pl. vi, fig. 74.
The histology of the alimentary canal has been carefully investigated by Wirén (1887, p. 31). Our results agree very closely with his.
This network is considered by Wirén and others to be parts of a continuous sinus. We are not convinced, however, that this is really the case, and our reasons will be found on p. 17 infra.
This groove has only hitherto been noticed by Wirén (1887).
Saint Joseph found in an Arenicola a whole Nereis almost digested. ‘ Ann. Sci. Nat.,’ series vii, t. xvii, 1894, p. 127.
Since writing this we have discovered that these small cells are the blood-corpuscles.
Retzius has described free nerve-endings on these setæ. ‘ Biologiska Foreningens Fórhandlingar,’ Bd. iii, Hefte 4—6,1891, p. 85.
Ward, ‘Bull. Mus. Harvard,’ vol. xxi, 1891, p. 143.
It was found to be least (1·0270) in specimens which had been kept for some time in sea water, and greatest (1·0311) in those which had been kept for thirty-six hours in moist seaweed only. The specific gravity of the sea water used was 1·0264.
Schneider, ‘Arbeit. Naturf. Gesellschaft,’ St. Petersburg, Bd. xxvii, Heft 1, 1890.
‘ Annélides de Naples,’ 1868, pl. xix, fig. 2, C.
“Oligonathus Bonelliæ,” ‘Mitt. Zool. Stat. Neapel,’ iii, 1882.
