The germ-cells. 647 



made. Evidently these germ-cells, along with those previously men- 

 tioned as in the normal position but far in front of the germinal nidus, 

 have followed or are following the usual germinal path, but at a point 

 too far forward. 



The normally placed germ-cells appeared gradually, increased in 

 number, and then as gradually tailed off. Ignoring differences in the 

 number of sections in the various rows, they w^ere met with in the 

 following numbers in 22 rows of sections: 1, 1, 7, 3, 8, 19, 20, 20, 

 27, 26, 26, 19, 23, 22, 22, 18, 15, 10, 12, 5, 7, and 1. The total 

 = 312. 



At various points of the mesentery (splanchnopleure) other than the 

 germinal nidus there were 120, within the mesentery 47, and in other 

 parts of the abdominal cavity 11. The complete total is 490, ex- 

 cluding those previously mentioned in front of the germinal nidus 

 and in the liver. 



The 11 classed as "found elsewhere" were, as in other cases, 

 mostly free in the body-cavity at some point or other. 4 of them 

 were obviously in degeneration. 4 others were free in the body- 

 cavity, and of the remaining three a single one was attached or 

 applied to the somatopleure, but not in it, one was similarly applied 

 to the splanchnopleure, and one was under the latter layer. 



The comparison with R. batis No. 454 is shown in the follow- 



512 490 



The number and distribution of the germ-cells in embryo No. 448 

 are thus seen to be very like what was found to obtain in embryo No. 454. 

 There are differences, as was to be expected, and while in the latter 

 embryo the total represents the exact theoretical progeny of a certain 

 number of synchronous divisions of one or two original cells, in the 

 former embryo there is a deficit of 22 germ-cells. But this is quite 

 made good by the couple of dozen vagrant germ-cells found in 

 the liver. 



