418 



JENNINGS— HEREDITY IN PROTOZOA. 



[April 24, 



Table VIII. 

 Mean Dimensions and Constants of Variation for Youngest Stages, in Corn- 

 is for convenience of reference in the text. The column headed 

 which fuller data are given on the lot in question. A " Lot " consists of 

 Table X., page 428. 



A. Progeny of D ( Cauda t it >. 

 1-orni ) . 



Lot I. Young halves, 

 I where depth of con- 

 striction is 4/i or less 



2 Lot I . Halves, where 

 j depth of constriction is 



[ more than 4/f 



3 Lot I. Random sample 



4! Lot 2. Halves, where 

 I depth of constriction is 

 I less than % breadth 



5 Lot 2. All halves of divid- 



I ing specimens 



6 Random sample 



7 Lot 3. Halves, depth of 

 constriction less than 

 % breadth 



8] Lot 3. Adults 24 hours old. 



B . Progeny of c [mc re Ha 

 Worm). 

 9' Lot 4. Halves, where 

 I depth of constriction is 



less than % breadth 



10 Lot 4. Halves, lengthening 

 I begun (constriction more 



than % breadth) 



1 1 Lot 4. Random sample 



12' Lot 5. Halves, where con- 

 striction is less than ^ 



breadth 



Lot 5 . Random sample 



Lots 4 and 5. All halves 

 where constriction is less 

 than ]^ breadth (com- 

 bination of rows 9 and 

 12) 



.23 

 E.> 



•Z3 



262 



364 

 200 



80 



124 

 200 



300 



132 



106 

 225 



(62) 

 14 



(43) 



(42) 

 30 



(44) 

 41 



Length. 



Mean. 



Standard 

 Deviation. 



('oefficient of 

 Variation. 



87.848^. 278 4.7i6=b.i97 5.36S±.224 



93033±-35S 

 199.960zb.740 



7.104^.251 I 7.636^.271 

 15.528zh.524 7.765=b.263 



82.600zt.468 4.394zh.332 



85.774^.593 

 1 84.100 zfc. 776 



83.810zh.498 

 168.532zt.419 



(47) 5i-868±.325 



(63) j 60.692zt.527 

 49 Ii4.i63±.784 



76 48 

 100 50 



208 



56.666 zh .425 

 Ii4.033zh.820 



6.924zt.42o 

 16.264zh.548 



4.782tz.352 

 10.768zh.296 



5.320zh.402 



8.o72zt.492 

 8.834tz.300 



5.7o6zt.42i 

 6.389±.i75 



3.9i2zt.i90, 7.54izt.445 



5.684zt.372 I 9.365±-6i3 

 i7.443±-555| i5.279±.497 



3.889zh.302 

 12.140zh.580 



6.862zh.533 

 10.646zh.513 



53.622±.30o 4.535zt.2i2, 8.459zh.3S 



(Table XL). In 131 of these specimens the constriction had sunk 

 less than one unit of the micrometer (4 microns) below the surface, 

 while in the other 182 the depth of the constriction was greater. We 

 may take the 131 specimens in which constriction had barely begun 



