PLATE LXXXI. 



PAGE 



Periphragella elisse, Marshall, . . 299 



Fig. 1. A fragment, preserved in alcohol ; natural size. 



Fig. 2. Transverse section of the wall (combination figure); x 50. 



Fig. 3. Dermal scopula with straight knobbed prongs and shaft ; x 300. 



Fig. 4. Discohexaster ; x 300. 



Fig. 5. Oxyhesaster with divergent terminal rays ; x 300. 



Fig. 6. Dermal scopula with divergent knobbed prongs ; x 300. 



Fig. 7. Small uncinatum ; x 300. 



Fig. 8. Dermal pentact, whose radial ray ends in a club-shaped swelling : x 8. 



Figs. 9, 10. Gastral scopulse with S-shaped prongs and a club-shaped swelling at 

 the end of the shaft ; x 300. 



