122 I»E. Gr- H. rOWLEE— BISCATAN PLANKTOIS' : 



APPENDIX ON THE VERTICAL DISTRIBUTION AND MOVEMENT OF THE SCHIZOPODA. 



£1/ G. Heebert Fowler. 



I HAVE added these few notes to the foregoing paper in order to bring the results into 

 line for comparison witli those which are being obtained in other groups of the collection. 

 In particular, the tables of averages seem to me to be important from the point of view 

 of the reader, because (for example) although the time-depth tables on pp. 118-121 give 

 throuo-h the eye a general idea of the distribution of a species as regards the upper 

 strata, they give no idea of the comparative numbers present ; further, the hauls having 

 been of varying duration and made with nets of varying mesh (both of which were 

 mistakes), a common standard is required for the real appreciation of their meaning, 

 certain hauls must be omitted as misleading, and so forth. 



EUPHAUSIA MtJLLERI. 



A reference to the General Table of Distribution (p. 112) shows that this species was 

 well represented in the Epiplankton, at any rate at certain hours. Below 100 fathoms 

 it occurred occasionally in the closing-nets 200-100 and 250-150 fathoms. It was not 

 taken by any of the 25 hauls which closed below 250 fathoms, with the exception of a 

 single specimen in 23 a (1000-750 fathoms) ; as it failed between 250 and 750 fathoms, 

 I venture to differ from Messrs. Holt and Tattersall in thinking that it probably is not 

 to be found alive much below 250 fathoms *. 



The captures with comparable nets are analysed in the following table t, which should 

 be read as a sentence from left to right : — 



* Its occurrence in 27 «', and 36/, jr, h, i, k, I, being all nets open to the surface, give no reliable indication of 

 its depth-limits. 



t In this Appendix, some Schizopods have been treated statistically in the same manner as vrcro the Chnctogiiaths 

 of a previous paper. " Average specimens " have been averaged over all hauls, whether the species occurred in them 

 or not; nine surface-hauls with a mesh of, 180 per linear inch have been omitted, as failing to capture strong 

 swimmers. The actual numbers recorded by Messrs. Holt and Tattersall have been treated where necessary with 

 a time-factor to bring them to the standard one-hour haul. 



X The rich haul of 31 b (11.30 p.m. to 12.30 a.m.), which also caught an unusual number of Nemaloscelis mef/aloj7S, 



