MARINE BIOLOGICAL STATION AT PORT ERIN. 53 



Acartia clausi was tolerably frequent on the English side, 

 but appeared to be entirely absent on the Canadian coast. 

 This particular species was replaced there by another 

 member of the genus, A. longiremis, which was very 

 abundant in the St. Lawrence, but is rarely met with in 

 the Irish Sea. Metridia longa, a cold-water Copepod, was 

 fairly plentiful about the time the ship was passing 

 through the area affected by the Arctic current. It was 

 only taken during a period of forty-eight hours' steaming. 

 Off the Irish coast Metridia lucens was noted. This species 

 was recorded by I. C. Thompson and myself, in the Report 

 on the Ceylon Copepoda, as extending from the English 

 Channel to the Grulf of Suez. One and a half days after 

 Dr. Roaf left Liverpool the ship apparently encountered a 

 swarm of Evadne nordmanni, which was the chief con- 

 stituent of the collection then taken. A few were noted 

 in the gathering of the previous day, but after that no 

 more were found till the ship had entered the Gulf of 

 St. Lawrence. 



Coming back to our own immediate neighbourhood, 

 we find, from a recent expedition in the Lancashire 

 Fisheries steamer, an interesting state of affairs. On 

 November 13th, starting from Piel Gras Buoy and pro- 

 ceeding N.W. to the Isle of Man, four hauls were made 

 with a Hensen quantitative net. The first haul was made 

 six miles from the gas buoy, the second 15 miles, the 

 third 24 miles, and the fourth 42 miles off the buoy. That 

 is, each of the three last hauls was made nine miles away 

 from the preceding one. The four hauls all contained an 

 abundance of diatoms, representing several genera and 

 species, but the quantity varied in each haul. The first 

 haul contained 4 c.c, the second 1 c.c, the third 2 c.c, 

 and the fourth 2\ c.c. of material. In the first haul 

 Rhizosolenia semispina and Chcetoceros (3 or 4 species) were 



