MONOGEAPH OF THE EXISTING CKINOIDS. 387 



Plate 13. 



Pig. 5S7. — Articular faces from the middle (a) and the ba.sal (5) portions of the cirrus in a specimen of 

 Antcdon bifida. (After W. B. Carpenter.) 

 588. — Dorsal view of the skeleton of the calyx and arm ba.se8 of Antcdon bifida just after the loss of the 

 lar\'al column, showing the relationships of the centrodorsal (which bears five mature and 

 five rudimentary cirri), the basals and the radials, and the extension of the visceral mass 

 as far as the IBrj; the radianal is visible in the posterior interradius. (After W. B. 

 Carpenter.) 



Plate 14. 



Fia. 589. — -Ventral view of an isolated rosette in a specimen of Antedon bifida. (After W. B. Carpenter.) 

 590. — Dorsal view of an isolated rosette in a specimen of Antedon bifida. (After W. B. Carpenter.) 

 591. — An incipient rosette in a young specimen of Antedon bifida, formed by the coalescence of the 

 five altered basals. (After W. B. Carpenter.) 



Plate 15. 



Fig. 592. — Ventral view of the centrodorsal of a young Antedon bifida at the time of detachment from 

 the larval column. (After W. B. Carpenter.) 

 593. — Ventral view of the centrodorsal of a fully grown specimen of Antedon bifida from Oban. (After 

 W. B. Carpenter.) 



PlJlTE 16. 



Fig. 594. — Dorsal view of the skeleton of the calyx and arm bases of a fully-grown pentacrinoid lar\a 

 of Antedon bifida just before the loss of the lar\-al cohimn, showing the relation between 

 the centrodorsal, basals, radials, and arm bases; in the interradius at the bottom of the figure 

 is seen the radianal. (.Vfter W. B. Carpenter.) 



595. — A specimen of Arachnocrinus bulbosiis, showing the similarity between the radials and the 

 swollen axillaries. (After Springer.) 



596. — An isolated radianal from a young specimen of Antedon bifida at the time of detachment from 

 the lar\-al column. (After W. B. Carpenter.) 



597. — The centrodorsal of a specimen of Antedon bifida in dors;il (a) and in lateral (6) view. (After 

 W. B. Carpenter.) 



Plate 17. 



Fig. 598.— Internal (ventral) view of an isolated radial of Antedon bifida at the time of detachment from 

 the lar\-al column. (After W. B. Carpenter.) 



599._External (dorsal) view of an Isolated radial of AnUdon bifida at the time of detachment from 

 the larval column, (.\fter W. B. Carpenter.) 



600.— Inner end of a radial from a specimen of Antedon bifida from England. (After W. B. Car- 

 penter.) 



601.— Dorsal face of a radial from a specimen of Antedon bifida from England, (.^fter W. B. Car- 

 penter.) 



602.— Ventral face of a radial from a specimen of Antedon bifida from England. (After W. B. Car- 

 penter.) 



