Journal of conchology . cp X) CJI 0 U) r IT m XI z 0 t- 0. : GROWTH ANH VARIATIOX OK tINIO PICTORUM. The area enclosed between the lines shewing the upper and lowerlimits, divided by the difference between the greatest and least lengthsfound, gives a measure of the variability of the species. Table III. Length No. of Width millimetres. Thickness millimetres. mm. shells. Min. Max. Mean. Min. Max. Mean. 15 I 32 32 32-0 10 10 TOO 16 17 18 3 40 43 417 11 12 11-7 19 4 40 42 4i25 II 13 1175 20 2 44 44 44-0 12 13 12-5 21 3 46 48 47-0 13 14 137 2-2 4 48 52 4925 13 15 1375 23 22 49 56 52-3 13 1
Journal of conchology . cp X) CJI 0 U) r IT m XI z 0 t- 0. : GROWTH ANH VARIATIOX OK tINIO PICTORUM. The area enclosed between the lines shewing the upper and lowerlimits, divided by the difference between the greatest and least lengthsfound, gives a measure of the variability of the species. Table III. Length No. of Width millimetres. Thickness millimetres. mm. shells. Min. Max. Mean. Min. Max. Mean. 15 I 32 32 32-0 10 10 TOO 16 17 18 3 40 43 417 11 12 11-7 19 4 40 42 4i25 II 13 1175 20 2 44 44 44-0 12 13 12-5 21 3 46 48 47-0 13 14 137 2-2 4 48 52 4925 13 15 1375 23 22 49 56 52-3 13 16 143 24 8 49 57 535 14 • 17 i5i 25 15 53 62 57-1 15 17 ^5-5 26 25 53 64 58-8 15 19 i6-8 27 27 57 69 6i9 15 19 16-9 28 17 61 71 64-8 16 19 i8-o 29 17 62 71 67-4 18 21 19-1 30 19 64 75 69-8 18 22 198 31 21 69 79 739 19 23 207 32 18 70 80 74-6 20 24 2 I 6 33 15 73 84 77-0 21 25 22-5 34 ^7 74 84 79-2 22 25 23-0 35 9 75 87 80-9 23 26 24-5 36 2 79 84 8i-5 23 25 240 37 I 88 88 88-0 27 27 2 70 Fig. 3 shews that the width is throughout a linear function of the
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Keywords: ., bookauthorconcholo, bookcentury1800, bookdecade1870, bookyear1879
