Plate 32 



Ampheraster marianus, station 1427, ■ 5. Projection of skeleton of portion of base of raj', 

 disk to right; C, carinals; 1 I, dorsolateral longiseries; S, I. marginals; .1/'. adam- 

 bulacrals. la. Same, station 1407, 11 48 nun., X10. Six superomarginal plates from 

 middle of raj to show distortion; adjacenl dorsolaterals, dotted; disk to left. 



I mphi raster chiroplus, station 1427, ■ 10. Projection of skeleton of portion of base of raj ; 

 C, carinals; S, superomarginals; /, inferomarginals; a, b, a, formation of four-lobed 

 plates from x and Y plates; ili--k to right. 



Ampheraster alaclus, type, ■'•">. Skeleton of portion of ray near middle, <li>U to right; 

 lettering as in fig. I. 3a. Two crossed ped. ().:>'_• nun., 100. 36. Same. Two 

 straight pedicellariae, 1.26 mm., ■ 25. 



Ampheraster hyperoncus, ■ 10. Marginal plates, jusl beyond middle of ray, i" sho\i char- 

 acteristic form; disk to left. la. Crossed pedicellaria, 0.34 nun., 100. 



193 



