296 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
up the two following tables on the same plan as those 
for the previous three years given in our last report, and 
using the same lists of oceanic and neritic species as the 
basis, so that the tables for the four years may be 
comparable. 
Table I shows the total numbers of oceanic species 
occurring on the days in each month when observations 
were made. 
Table II shows chiefly the average number of days 
in each month when oceanic and neritic species respec- 
tively occurred. 




TABLE I., 1910. Jan. Feb. Mar. Apr. May June 
Total days worked .................. i! 10 8 10 8 fj 
Otel ON oes con ee es secuas ore ven es 27 31 37 50 50 42 
dL otalO di racopsearers. cc aeees ose 16 16 16 19 20 21 
Percentage, OW tics acm etros 59:2 51:6 43:2 38 40 50 
a hae ‘July ‘Aug. Sept. g Oct. Nov. Dec. 
Lotal days worked | ...:2.i../5.-0.5. 9 9 9 9 8 9 
Total O-N  j iccsessteaeestoues teense 39 32 49 50 44 46 
POtal OQ) Perse ace een ncn cares de 20 17 21 22 21 26 
Percorituge’ Oc. pecs. senna eseeeees 51:3. 53-1 42:8 44 47-6 56-5 

The percentages of oceanic species shown in the last 
line afford the best basis of comparison with the similar 
tables given in last year’s report; and they show the 
same tendency in the corresponding months :—January 
is more oceanic; February, March, April and May less 
so; June and July show an increase, while September 
and October are less, and December, hke January, 
distinctly more oceanic. 

TABLE II., 1910. Jan. Feb. Mar. Apr. May June 
. Total days worked ............ 7 10 8 10 8 7 
‘3 Total number of species ...... 16 16 16 19 209m 2! 
S 1 occurrences... 87 117 78 133 118 114 
S Mean occurrence -...:!,-.>:.-.- §-44--7-31 487 7 59 5:43 
Percentage of possible ......... Td toll OO 10 is1y 10-0 
Total number of species ...... 11 15 21 31 300s 21 
3 a occurrences... 44 67 el OOe Bole wl sr 87 
& Mean occurrence: ............... 4 4-47 4-76 6-84 4-56 4-14 
Z Percentage of possible ......... 57-1 44:7 595 684 57 59-1 

