Platk 4 



Fig. 1. Freyella microplax, 10. Month plates and first adambulacral, the distal joint of which 

 is not a syzygy. In, Same, X 10. Segment of actinostomial ring, peripheral view. 

 On right the second ambulacra) and first adambulacral have been removed to show 

 mouth plates o; "', a 2 , first and second ambulacra) plates; ad, first adambulacral; i, 

 interradial plate. lb. Same as la, but a dorsal view. ■ It); lettering same as la; 

 o shows the extensions of the mouth plate which normally lie behind the first adambula- 

 crals, as in In. \c. Same, X300. Pedicellaria from furrow spinelet. 1'/. Same. 

 X 10. Ninth adambulacral plate, specimen a. le. Same, X 10. Eleventh adambula- 

 cral plate, specimen b. 1/. Same. ■ it). Twenty-seventh adambulacral plate, near 

 outer end of genital region. 



2. Freyella insignis, X10. Ninth and tenth adambulacral plates. 2a. Same. '.'t). Fifth 



subambulacra) spine, X20. 



3. Astrocles actinodetus, <200. Large variety of pedicellariae of furrow spinelets, length 



0.33 mm. 3a. Same, specimen u. ■ 10. Mouth plates and tir^t adambulacral plates. 



The curiouslj expanded valve-like, furrow spines are shown meeting across fuTTOW, 

 on right. 3l>. Same, specimen b, II). Note the different actinostomial oral spines. 



Hi.-, 



