Reprinted from the "Quarterly Journal of Microscopical Science, 



Vol. 41. 



THE HABITS AND STRUCTURE OF ARENICOLA MARINA. 



By F. W. Gamble, M.Sc, and J. H. Ashworth, B.Sc, Demonstrators 

 and Assistant Lecturers in Zoology, Owens College, Manchester. 



With Plates VI.— X. 





Contents. 





1. 



Distribution : Varieties : 



7. 



Gills. 





Habits. 



8. 



Nervous System and Sense 



2. 



External Features : Segmenta- 





organs 





tion : Skin : SetaB. 



9. 



Nephridia. 



3. 



General Anatomy of the Internal 



10. 



Co3lom. 





Organs. 



11. 



Reproductive Organs. 



4. 



Musculature. 



12. 



General Summary. 



5. 



Alimentary Canal. 



13. 



Literature. 



6. 



Vascular System. 







I. — Distribution : Varieties : Habits. 



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 (Wiren, 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 Arentcola marina. South 

 of this it is replaced in the Mediterranean by A. <Jlaparedii, Lev., and 



