414 



JOHN BEARD, 



It is also suggested that, while in the higher plants the sexual 

 generation becomes more and more reduced with the higher evolution 

 of the asexual generation, in the animal kingdom the conditions would 

 appear to be reversed, as we ascend the scale; for here the sexual 

 generation would be the one to attain higher and higher morpho- 

 logical ditïerentiation with a progressive reduction and degeneration 

 of the asexual generation or larva. 



Appendix a. 



Table of sizes, number of somites and state of gill-clefts or pouches 



{R. baiis). 



number 

 of 



embryo 



size 



somites 



gill-clefts or pouches 



spiracle 



I- I 



II. 



III. 



IV. I V. 



45 



49—50 



54—55 



60 



55 



76 



75—80 (?) 



83 



85 



86 



about 90 



95—97 (?) 



92 about 



about 90 



about 90 



99 



100 

 97 

 106 

 101 

 101 

 100 

 104 (?) 

 110—112 

 104 

 111 

 104 

 -') 



0. = open. p. = pouch. 



(?) 



p- 

 p- 

 p- 

 p. 

 p- 

 p- 

 p- 

 p. 

 p. 



(reaches skin) 

 p. 

 P- 

 P- 



0. 



(one side) 

 P- 

 P- 

 P- 

 P- 

 P- 

 o. 

 o. 

 o. 

 o. 

 o. 

 o. 



0. 



p(?) 



P 



P 

 P 

 P 

 p 

 p 

 p 

 p 

 p 

 p 







p 



o 



1) probably 135—140. 



