328 K. S, CLARK. 



The young-fisli trawl was used throughout for the capture of the 

 specimens, and hauls were taken at depths ranging from the surface to 

 the bottom. This method of securing the young pelagic stages has 

 proved so successful in the Danish researches that it has been followed 

 at Plymouth, with equally good results. 



All the nets used were constructed on the system of the Petersen 

 young-fish trawl, and three qualities of material were used. These were 

 coarse sacking (" Stramin "), with mesh xV" square ; cheesecloth, with 

 mesh tjV" square ; and mosquito netting. In order to withstand the 

 strain of pulling on board, the last type was strengthened by an outer 

 herring-net. It was noticeable that every sample taken with the first 

 two types contained a mass of stringy substance, indicating considerable 

 wear and tear of the net. As a result, these nets became weakened and 

 quickly broken up, especially near the cod end. 



Table 1 gives a record of the number of hauls with the locality, date, 

 and depth at which these were taken. To distinguish between the hauls 

 taken by Mr. Hefford and those by myself, I have used the letters H and 

 A respectively, which appear after the number of the haul. Letters 

 corresponding to the chart areas are also represented. 



Tables 2-24 contain records of the number and size of the individuals 

 of each species investigated, and these are usually accompanied by short 

 notes on the more important biological features of the particular groups, 

 but it has been necessary to give a detailed description of a few forms 

 which appear to be either entirely new, or at most, little known. 



Table 25 summarizes the captures of the species the individuals of 

 which were too numerous for separate tabulation. 



The region investigated and shown on the accompanying chart has 

 been subdivided into areas with latitude of 5' and longitude of 10'. An 

 approximation to the positions of the hauls can thus be arrived at by 

 reference to Table 1. Small crossed circles have been used to indicate 

 the position of the hauls for the years 1906-1909 and plain circles for 1913. 



The credit of the work for the results from 1906-1909 must be given 

 to Mr. A. E. HefEord, while I have received much helpful advice from 

 Dr. Allen, Mr. C. Tate Eegan, Dr. Kyle and Mr. E. T. Browne. In the 

 preparation of this report I have had the assistance of my colleague 

 Mr, E. Ford, to whom I am also greatly indebted for the excellent series 

 of drawings which are reproduced in the text and for the lettering in 

 the chart. Further, Mr. Gossen has been a valuable help in the collect- 

 ing and sorting out of the material. 



