FROM THE EDDYSTONE GROUNDS TO START POINT. 485 



chieliy on shells of Pectcn opercularis, were obtained on Grounds VIL, 

 IX., and XIV. The species is characteristic of the coarse grounds 



rather than of the fine sand. 



Distribution. Geographical. East of North America, Faroe, North and "West Norway, 

 White Sea (?), Scotland, England, North and West of France, Mediterranean {fide 

 Michaelsen). 



DqHh and Bottom-deposit. The Pommerania dredged Filograna implexa in the North 

 Sea on "sand and Sahellaria tubes" at 12 fathoms, on sand and slicll at 50 fathoms, on mnd 

 and on gravel and mud at 106 fathoms, on all of which grounds it was iilentifid (Jliil)ius, 

 No. 87). The Norwegian North Atlantic expedition took it on clay at 415 fatlioms 

 (Hansen, No. 36), and the Caudan in the Bay of Biscay on gravel and sand at 98 fathoms, 

 and on mud at 160 to 220 fathoms (Roule, No. 101). Saint-Joseph and Hornell both 

 record it occasionally from the shore. 



Dasychonc homhyx (Table YI.). Common on both fine and coarse 



grounds, attached to shells, etc. 



DiSTRiiiUTiox. North and West Norway, British Seas, North Sea, English Channel, 

 Mediterranean [fide Saint-Joseph and Michaelsen). The Caudan took one specimen on a 

 coral bottom at 220-270 fathoms in the Bay of Biscay. Saint-Joseph found it on the 

 shore and in deeper water. 



Protula tuhUaria. Occasional specimens only on the Eddystone 

 coarse grounds and on two fine sand grounds (VII. and VIII.) im- 

 mediately adjoining the latter. 



DisTRiKUTiox. A southern species. Mediterranean, Atlantic, Channel. At Diuard it 

 is found in from 2 to 15 fathoms. The Pola dredged it in 515 fathoms {fide Saint-Joseph, 

 No. 102). 



Serpula vermicularis. Not uncommon on all grounds where shells 



are present upon which it can fix. 



Distribution. North-West and West Norway, Faroe, British Coasts, Englisli Channel, 

 Atlantic to Madeira, Mediterranean {fide Michaelsen and Saint-Joseph). The species was 

 not obtained in the North Sea itself by either the Pommerania or by Michaelsen. The 

 Norwegian North Atlantic expedition took it in 142 and 223 fathoms on grey clay and on 

 sandy clay (Hansen, No. 36). The Caudan found it abundant on gravel and sand at 98 

 fathoms, abundant at three stations on mud from 104 fathoms to 219 fathoms, and at two 

 stations on coral at 219 to 273 fathoms (Roule, No. 101). It would seem that this is a 

 deep-water species, with its centre of distribution at depths of 100 to 300 fathoms, of 

 which occasional individuals reach to the shore. This would explain the fact that although 

 it has an extended distribution botli north and south, it is not frequently taken in the 

 North Sea. 



Hi/droides norvegica (Gunn). This serpulid is the common species 



growing on shells and on the stems of hydroids on all grounds where 



shells are present. On Grounds I. and II. it is found chiefiy on Cardiiim 



echinntum shells. On many grounds it occurs on Buccinum undatum 



shells inhabited by Eupagurus Bernhardiis. 



Distribution. Norway, North Sea, Atlantic, Mediterranean {fide Michaelsen and Saint- 

 Joseph). The species occurs on all kinds of grounds to deep water (300 fathoms, Norwegian 

 Nortli Atlantic expedition, Hansen, No. 36). 



Fotamoceros iriqueter is much less common than Hydroides norvegica, 



but occurs on both fine and coarse grounds. 



Distribution. Iceland, Faroe, North and West Norway, North Sea, British Coasts, 

 French Coasts, Mediterranean {fide Michaelsen, No. 79, and Saint-Joseph, No. 102). 



