NOKTH SIDE OF THE BAY OF BISCAY, AUGUST, 1906. 17 



species were found, nearly all of them being fixed to the larger 

 Hydroids, Aglaophenia, Antennularia, and Scrtularella. 



Station II. This station is a continuation of Station I., but here 

 an Agassiz trawl was used in the place of a dredge. There is a 

 distinct decrease in the number of Aglaophenia myriophylhim and 

 Antennularia antennina. The dredge, no doubt, is a better instrument 

 for digging out these rooted Hydroids than the trawl. On the other 

 hand, Sertulardla poli/zonias and Dijjhasia pinaster, both attached to 

 worm-tubes, show an increase in number in the haul taken by the 

 trawl over that of the dredge. 



The species taken at this station are nearly the same as those found 

 at the first station, but Sertularia abietina is an addition. The latter 

 is a fine old colony with branches thickly covered with other small 

 Hydroids. 



Station III. A large otter trawl was used at this station, which 

 was a few miles south-west of Station II. The trawl brought up a 

 fine large colony of Diphasia pinnata, and a large colony of Sertularia 

 ahietina. Upon tlie latter were attached small colonies of Sertularclla 

 p>oli/zonias. 



The great falling off in the number of colonies at this station must 

 be put down to the use of the otter trawl. 



All the Hydroids taken at Stations I., II., and III. have been recorded 

 for the Eddystone Grounds. There is a remarkable similarity between 

 the Hydroid fauna of the two regions, though they are far apart. 



Station IV. Near La Chapelle Bank. 109 fathoms. Bottom 

 deposit — coarse sand and broken shells. 



This station was about fifty miles to the south-west of Station III., 

 and here a dredge was used. It brought up a large colony of Scrtularella 

 pohjzonias attached to a worm-tube, a very fine colony of DipJiasia 

 alata, and a small colony of Diphasia pinaster on a worm-tube. Four 

 other species were found upon these Hydroids. 



Station V. 109 fathoms. Bottom deposit — coarse sand and shells. 



An Agassiz trawl was used at this station, which was not far from 

 Station IV. 



Here Diphasia alata, Sertulctrella pohjzonias, and Diphasia 'pinaster 

 were again the principal Hydroids. Dijjhasia alata may be regarded as 

 the characteristic Hydroid for Stations IV. and V. It was not taken 

 at any of the other stations, and it has not been recorded for the 

 Eddystone Grounds. 



Station VII. Over 444 fathoms. 



Although this station was only a few miles south of Station V., the 

 water is about four times as deep. An Agassiz trawl was used, but it 



NEW SERIES. — VOL. VIII. NO. 1. B 



