12!^ 



TAGE SKOCxSBERG 



,,The ratios for BrOOKS's law come out sufficiently clearly, although the total numbers 

 are small, and in spite of the difficulty of separating this species from magna at the lower stages. 



Taking the means as a basis for calculating: 



? 1,07 X 1,48 = 1,58; 1,58 X 1,48 = 2,33. 



o" 0,77 X 1,40 = 1,078; 1,08 >, 1,40 = 1,51; 1,50 X 1,40 = 2,10" (1,51 X 1,40 == 2,11), 

 (p- 2H6). :_. 



Conchoecia rhynchena G. W. MtlLLER. 



Stage II. 



Mean 2,47. 



Slage III. 

 Mpaii I.fiO. 



Stage H". 

 Mean 1.0 i. 



Stagp v.! 

 Mf-an 0.70. 



Length in mm.: 

 Vumlier n|' o measured: 



1,5 

 1 



1.1 



1,0 

 1 



0,9 

 1 



0,8 



9 



0.7 

 1 



0.0 



Total specimens measured: 28 ?. 



,,In the females the reaction to a growth-factor is very close: — 0,7 x 1,54= 1,07; 

 1.04 X 1,54 = 1,60; 1,60 >: 1,54 = 2,46. As there are only three males to represent kStages III. 

 and TV., it is useless to discuss their growth-factor." (p. 272). 



Conclwecia imhricata (G. S. Brady). 



stage II. 

 Mean 2.34 



Stage III. 

 Mean 1,.50 



Stage IV. Stage \\ 

 .Mean"0,96 MeanO.OC 



11 



1.0 

 14 



6 I 

 0,9 0.8 



0,7 0,6 



Stage II. 

 Mean 2.01 



Stage III. 

 Mean 1.48 



Stage I\'. 

 -Mean 1,0 



Total specimens measured: 65 ? + 36 o- 



,,Now, taking the mean lengths of the females at the different stages: — 0,62 x 1,56 = 

 (».96; 0,96 X 1,56 = 1,497; 1,50 x 1,56 = 2,34 .... The males are much fewer and there- 

 fore respond less accurately: — 1,0 x 1,45 = 1,4; 1,4 y 1,45 = 2.03." (pag. 225). 



Conchoecia dwphnoides C. ClaUS. 



Staiie 1. 

 :\Iean 3.08. 



Stage UI. 

 -Mean 1,2. 



Length in mm. : '. 3.5 



Xnniher of $ measured : ! 1 



3.2 



3.1 



15 



3.(1 

 31 



2,9 

 9 



2.8 

 5 



2.6 

 1 



1.2 

 I 



Total specimens measured: 112 $. 



„In addition to the numerous specimens of Stage I. there was a single female spechnen 

 of (apparently) Stage III.; this with the aid of a slide-rule enables one to make an empiric 

 guess at the mean of Stage II. With a growth-factor of 1,6 for females it appears that 1,2 x 

 1,6= 1,92; 1,92 x 1,6 = 3,07; and we may fairly presume that the mean of Stage II. will 

 be a little more or less than 1,9" (p. 263). 



