Plate 7:; 



Fig. 1. Lysaslrosoma anthosticla. Marginal and 5 abactinal plates, from proximal half of ray; base 



of raj I" the right; .1, abactinals; S, spiniferous superomarginals; /, inferomarginals; 



AD, adambulacrals; secondary marginals shown between the superomarginals; X10. 



1./. Same. Marginal plates from near lip of ray showing absence of connections; lettering as 



in 1; base of ray to the left; X 10. 

 \li. Same. Diagram of plates of mouth angle. 1 J. first 4 superomarginals; I III, first 3 

 inferomarginals; i, probable primary interradial plate; ,1/, mouth plate; AD, first, 

 enlarged adambulacral plate; ■ K). 

 lc. Same. Aliaetinal spinelet, <50. 



Id. Same. Two inferomarginal plates (/> showing the sheath common to two spines ami 

 above, 2 supermarginal spines; below, 5 adambulacral spinelets {AD) with attendant 

 pedunculate straight pedicellariae; P intermarginal papulae; near base of ray, ■ ID. 

 lc. Same. Vestigial platelet from abactinal integument, ■ 200. 

 1/. Same. Abactinal crossed pedicellaria, 0.21 mm., • 200. 



\ij. Same. Portion of a jaw enlarged 400, to show eharactersitic enlarged tooth. 

 \li, \i, \j. Same. Straight pedicellariae. 1//, abactinal, 0.45 mm. long -100; 1./. abactinal 

 0.14 mm. ■ 200, one of the tiny kind; li from adambulacral plates. 11.27 mm. X100. 

 2. Lysaslrosoma desmiora ('lark; abactinal crossed pedicellaria, 0.27 mm. long, X 150. 

 234 



