16 F. JEFFREY BELL. 



DESCRIPTION OF PLATES. 



ECHINODERMA. 

 Plate I. 



Fromacochrinus kerguelenensis. 



Fis. 1. — Disc and base of arms from the side to show the insertion of the cirri, and the form of the 



cirrus pit, and the shape of the disc, x 2. 

 Fig. 2. — Disc and base of arms from below ; the central boss is more distinctly seen than in iig. 1. 



Fig. 8. — An arm from the side, x 3 ; the roughened edges of the joints are well seen in this figure ; the 

 proximal pinnules only are completely shown. 



Plate II. 



Antedon adriani. 

 General view of this Crinoid. x 2. 



Plate III. 



Heuresaster hodgsoni. 



X not quite |, seen from below, to show the breadth of the ambulacral grooves, their size and 

 arrangement. 



Plate IV. 



The young Ophiurid (see p. 14). 

 Fig. 1. — ^Aboral view of disc and arm. x |. 

 Fig. 2. — Oral view of same. X f . 



Fig. 3. — View of mouth to show arrangement of the oral and adjacent plates, x 8. 

 Fig. 4. — 1st, 2nd, and 3rd upper arm-plates, x 10. 

 Fig. 5. — Yiew of arm from above, at about its middle, x 10. 

 Fig. 6. — 1st, 2nd, and 3rd lower arm-plates, x 10. 

 Fig. 7. — ^View of arm from below at about its middle, x 10. 



Plate V. 



Fig. la. — Variety of Gycethra (see p. 10) from above ; fig. lb from below ; both slightly reduced. 



Fig. 2a. — Disc of an Ophiosteira (see p. 12), magnified to show keel-like plates ; 2a, seen from above ; 



2b, seen from the side. 

 Fig. 3. — Pseudopsolus ferrari. x f. 



