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expected to yield a satisfactory mean; the mean is too low to fit with the ratios between
Stages III. and II.: 1,08 X 1,30= 1,40; 1,40 X 1,30 = 1,82“ (p. 275).
Conchoecia procem G. W. MÜLLER.
Stage II. Stage 111. Stage IV. ?Stage Y.
Mean 1,16 Mean 0,9 Mean 0,64 Mean 0.5
Xumber of $ measured: 1 39 27 8 4 5 1
Length in mm. : 1,3 1,2 m 1.0 0.9 0.8 0,7 0,6 0.5
Xumber of y measured : 6 35 i 14 2 i
Stage II. Stage III. Stage IV.
Mean 1.11 Mean 0,9 Mean 0.66
Total specimens measured: 85 Ç + 62 <J.
,,Taking the females first: —0,64 x 1,36 = 0.87; 0,87 X 1,36 = 1,18. On
morpho-logical grounds the specimen at 0,5 appeared to belong to an earlier stage than those at 0,6
and 0,7 ; and by the same growth-factor this stage would hâve a mean at 0,47. — In the males
there is an overlap of the Stages II. and III. at 1,0 . . . . the numbers are too small for
accuracy: 0,7 X 1,26 = 0.88; 0,88 X 1,26 = 1,10.“ (p. 271).
Conchoecia Haddoni G. S. Brady and A. M. NORMAX.
Stag*’ 1- Stage II. Stage m. Stage 1\. ?stageV.
Mean 2,72. Mean l,66. Mean 1,1. Mean 0,66. Mean 0,4.
Length in mm.: 3.0 2.9 2.8 2.7 2.6 2.5 1.7 I 6 1,1 0.8 0,7 0,6 0.5 0.4
Xumber of 2 measured: 2 1 4 3 6 1 2 1 16 3 1 3
Total specimens measured: 37 + ?3 = 40$.
,,In the females the usual proportions between the means appear, the second place of
decimals being somewhat vague, presumably owing to the paucity of specimens. Thus,
0,62 x 1,64 = 1,01; 1,01 x 1,64 = 1.656; 1,66 x 1,64 = 2,72. The observed mean of 0,66
for Stage IV. is perhaps too high, and the growth-factor employed a little larger than the
true factor“ (p. 265).
Only 5 males were measured, representing two different stages.
Conchoecia hyalophyllum C. CLAUS.
Stage I. Mean 2,3 Stage IL Mean 1,58. Stage III. Mean 1,07.
Xumber of 2 measured: Length in mm.: Xumber of tj measured: 1 2.5 i) *> 1 ?1 2,1 8 1,7 24 13 1.6 1.5 8 , 2 y >) 1.4 1 8 5 1.2 1.1 1.0 7 1 0,7 1
Stage I. Mean 2,3 S lage II. Mean 1.5. Stage III. Mean 1.08. Stage IV. Mr«n 0,7.
Total specimens measured: 62+ ?1 Ç + 43 d-
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