422 transactions liverpool biological society. 



(2) Dr. Jameson's Collection. 



The second collection was given to me by Dr. H. Lyster 

 Jameson, by whom it was made, with the following note : 

 " This collection was taken at the end of April, 1901, on 

 " the ' Shelling Grounds ' in Fortescue Straits, a passage 

 " about half a mile wide and five miles long, between 

 " Sidea, Basilisk Island, and Basilaki, Moresby Island. 

 " The depth varies from fifteen fathoms to forty fathoms. 

 " Currents, up to so much as five knots per hour, run 

 " through it between the Coral Sea and Goschen Strait. 

 " The tidal current runs direct between the Pacific and 

 " Indian Oceans. The shell is Margaritifera maxima, 

 " Jameson — one of the pearl oysters. This species of pearl 

 " oyster is always found on grounds where there is a 

 " tremendously rich plankton." 



The collection was represented by one surface tow- 

 netting, containing about five c.c. of solid matter, chiefly 

 Copepoda. The Copepoda consisted of thirty-five species. 

 Although no new species were obtained, the gathering is 

 of much interest, as it increases our knowledge of the 

 distribution of described forms. 



Amongst the other organisms in the collection, a number 

 of examples of the Peridinian, Ceratium tripos, in the 

 chain condition, were observed. According to Mr. George 

 Murray, this state of Ceratium has been observed only in 

 the open sea, far away from land. It is probable that the 

 strong currents referred to by Dr. Jameson may have been 

 the means of conveying it so close to land in this instance. 



List of Copepoda. 



Calanus minor (Claus). Oithona plumifera, Baird. 



Mecynocera clausii, „ linearis, Giesb. 



I. C Thomps. „ brevicomis, Giesb. 



