L. W. BVKNK 



111) 



Nmiilior dt' Pljitcs 



1. 



2. (a) 



(6) 



(c) 



{d) 



3. (i) («) 



(&) 



(ii) («) (1) 



(2) 



» I n 

 m \ m 

 n + k-\ n 

 m I m 

 n I M + ^' 

 m I ni 



M I n 

 m + k- I y/( 

 »( I 11 

 m I m + /' 

 n+i: I ;i 

 ?n + i I TO 

 n I K + l' 

 m I m + l 

 n+k\ n 

 m \m+k 

 11 I n + k 

 m + l' I m 



SO . ,11 



I 



S:i 



■14 Sr> 36 



— 3 — 



15 

 17 

 10 



7 

 2 

 1 



15 

 2 

 2 



1 

 9 



4 



ÄS 



Ä.9 



^/O 



TDtal ! Per c«nt. 



13 



19 



7 



7-G 



2-8 



Total 



1 3 



9 23 24 60 54 40 17 11 



Per Cent. 



3-6 9-2 9-6 24 21-6 16 6-8 4-4 



2-4 



1. 



Total 

 7i I n 

 m I m 



2. Asymmetrical in one series* 



3. (i) Asymmetrical in both f — • 



3. (ii) Secondarily symmetrical 



* Very few specimens bave an even number of plates and these are omitted in traciug tlie diagram. 

 + Specimens witb an odd number of platea omitted. 



