424 F. W. GAMBLE AND J. H. ASHWORTH. 



2. Distribution and Habits. 

 Distribution. 

 The genus Arenicola may be divided into two sections; 

 one (including- A. Grubii and A. ecaudata) in whicb the 

 gills and parapodia are continued to tlie end of the body, and 

 a second (including the remainder of the genus) in which 

 these structures are confined to the middle region. Of the 

 members of the first section, A. GTrubii is the more southern 

 form, occurring in the Irish Sea, North Atlantic, the Channel, 

 Mediterranean, and Black Sea; while A. ecaudata ranges 

 from Norway on both the east and west coasts of Great 

 Britain and Ireland to the Channel. Neither of these species 

 has been hitherto recorded from the American continent. 



The section of the genus including A. marina, A. cristata, 



and A. Claparedii occurs on both sides of the Atlantic. It 



was pointed out in our paper (1898) on A. marina, that lat. 



40° N. approximately marks the southern limit of this species, 



since it is not found either in the Mediterranean or south of 



New Jersey. In these more southerly latitudes its place is 



taken by A. cristata, which, however, appears to be rare at 



Naples, while it is abundant at Charleston Harbour, Virginia 



(Stimpson, 1856), and at Anglesea, ten miles north-east of 



Cape May (Ives, 1890). It has also been found at Jamaica 



(Liitken, Duerden), Florida, and is reported from Vancouver 



and Alaska on the Pacific coast. Arenicola Claparedii 



is a common Mediterranean form, and four specimens which 



exhibit the distinguishing features of this species have been 



sent to us from California. 



In his catalogue of non-parasitical worms in the British 

 Museum, Johnston (1865) records three species of Areni- 

 cola — (1) the common species, A. piscatorum (A. marina), 

 (2) A. branchialis, (3) A. ecaudata,^ — but only the first 

 and third of these are recognised generally as British. 



1 Johnston first recorded and described this species in 1835 (' Loudon's 

 Magazine '), but gave a new diagnosis and figure in tliis Britisli Museum 

 Catalogue, 



