180 R. T. JACKSON STUDIES OF PAL.EECHINOIDEA. 



Table of Plate Arrangement of Melonites glganteus, sp. nov. 



Melonites giganteus, sp. nov. 



= C8 



o « 

 o 2 



2 



Interambulaerum A t 



(This area is figured on plate 5, 

 figure 21.) 



Ambulacrum B. 



Interambulaerum C*. 



11 







£ 



_^ 



__^ 







c; 



rt 







o 



















:S 



<« 



o 



O 







& 



















p 







0) 



01 





5D . 



s 





a ^ 









.a 09 



c sc 



c W) 



a 



0) 



-1^ 





a,0 



c 



c 



cS 



c 



a 



E 



a 



a 



s 



a 



D 



So 



3 



3 













O 



0) 



t.1 



o 



O 



O 



^ 



O 



o 



O 



11 



p 



28 



5 



5 



10 



p 



21 



5 



4 



9: 



p 



17 



4 



4 



8 



p 



14 



4 



3 



7 



p 



10 



3 



3 



6 



p 



8 



3 



2 



5 



p 



5 



2 



2 



4 



p 



3 



I 



2 



3 



X 



2 



1 



1 



Heptagon on left or right 

 ot terminal pentagon. 



Right. 



Right. 



Right. 



Left. 



Right. 



Left. 



Left. 



Truncates initial plate 3. 



First row of plates wanting. 



Four columns of plates at base. 



9| 



P 



1G 



4 



4 



8 



P 



13 



5 



U 



7 



P 



10 



3 



3 



6 



P 



8 



2 



3 



5 



P 



6 



2 



2 



4 



P 



3 



2 



1 



3 



X 



2 



1 



1 



Right. 



Right. 



Left. 



Right. 



Left. 



Truncates initial plate 3. 



First row of plates wanting. 



Ambulacrum D Four columns of plates at base. 



Interambulaerum Ef 



Ambulacrum F. 



Interambulaerum G 



11 



11 



P 



29 



5 



5 



10 



P 



23 



.5 



4 



9: 



P 



17 



4 



4 



8 



P 



12 



4 



3 



7 



P 



10 



4 



2 



6 



P 



8 



3 



2 



5 



P 



5 



2 



9 



4 



P 



3? 



2 



1 



Right. 



(?) Broken away. 



(?) Broken away. 



Right. 



Left. 



Left. 



Right. 



First two rows of plates wanting. 



Four columns of plates at base. 



11 



11 



P 



27 



6 



U 



10 



P 



21 



5 



4 



9 



P 



16 



4 



4 



8 



P 



14 



4 



3 



7 



P 



11 



3 



3 



« 



P 



8 



3 



2 



5 



P 



G 



2 



2 



4 



P 



3 



2 



1 



3 



X 



2 



1 



1 



(?) Broken. 



(?) Broken. 



Right. 



Left. 



Right. 



Left. 



Right. 



Truncates initial plate 3. 



First row of plates wanting. 



* Interambulaerum incomplete at dorsal portion of area, 

 t Interambulaerum complete at dorsal portion of area. 

 X See foot-note, page 181. 

 P = Pentagon. X = Hexagon. 



