27 
TABLE 
XI. 
Showing upper limit of survival of Mytilus edulis L. during first below the beam series 
experiment in 1919. 
ERlONGlerevrancee ford P we Siaerg sek oe Soph eee AQ) B24| E222). 2) P20) G2" | 2 125 Ke 
Height mi feet above low water datum | 9.5/11.1/12.7|14.2)15.9/17.6/19.2)21.0/22.6/24.3 26.0 
Average’length in mm. when set out | a 
Alloy te ee ease sh ots Wt eb! 8 WO ay eC | TEN | ETE SU Te | OU val aye abe alal 
Number ae ece when set eee 51 Phin 54 58 | 49 | 37 69 29 “42 sae 
Raber Surwiving-|uly Tc:<seee 0.5: 34 | 16 | 44 | 44 | 29 | 44] 11 | 58 | 25 | 388 “oF : 
Number surviving July 15.........:.. 6 Cay ]] TE Ne) ae ey 27 10) a4 o5* 
Number surviving July 381........... | ? BS sta ON PI se PAN ee Oe. alge 
Note.—Numbers marked * included large proportion of dead mussels. 
TABLE 
XII. 
.Showing rate of increase in length of Mytilus edulis L. during second south pile wharf series 
experiment in 1919. 
Block A3 
Height in feet above low water 
Bey abUsilerters = ee cfre meyer 9.5 
Average length in mm. when set 
OUI Ont HN nel 9 
Nee bee SEC GME ee erasures 95 
Mice surviving Aug. BAS 94 
ee surviving Sept. 1..... ? 
Maes surviving Sept. 16.... 50 
ee recovered Oct. 28..... 94 
14.2 
69 
61 
E3 F3 G3 H3 | 13 
15.9} 17.6) 19.2] 21.0/22.6 
75 45 ? i; ? 
? ? 29 >? 126 
? ? 3 15 | 3 
Percentage recovered Oct. 28... 99 
Average length in mm. Oct. 28. 10.8 
Average increase in length in 
mm. from Aug. 19 to Oct. 1.8 
Ss 4:CreInE DORCAS. ¢ ws. = =< 
Average increase in length in 
mm. per day from Aug. 19 | 0.036) 0.071) 0.033 
COLOCER ZS etre see See ye 
B3 C3 
te Ae 12257, 
9 9 
84 84 
80 80 
? ? 
? ? 
59 44 
70.4) 52.3 
12.5) 10.6 
Sr Ole LG 
41 
30.4 
Oi 
0.015 
ZAM ds no! | MaiOlln One 
O57 Ol 2 TOC Seo: t 
0.015} 0.024) 0.036)0.0028 
