

MONOGRAPH OF THE EXISTING CBINOIDS. 387 



PLATE 13. 



FIG. 587. Articular faces from the middle (a) and the basal (6) portions of the cirrus in a specimen of 



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



588. Dorsal view of the skeleton of the calyx and arm bases of Antedon bijlda just after the loss of the 

 larval 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 IBr 2 ; the radianal is visible in the posterior interradius. (After \V. B. 

 Carpenter.) 



PLATE 14. 



FIG. 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 aspecimen of Antedon bifida. (After W. B. Carpenter.) 

 591. An incipient rosette ina 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 bifidaa.t 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 6i/WafromOban. (After 

 W. B. Carpenter.) 



PLATE 16. 



FIG. 594. Dorsal view of the skeleton of the calyx and arm bases of a fully-grown pentacrinoid larva 

 of Antedon bifida just before the loss of the larval column, showing the relation between 

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

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



595. A specimen of Arachnocrinus bulbosus, 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 larval column. (After W. B. Carpenter.) 



597. The centrodorsal of a specimen of Antedon bifida in dorsal ia) and in lateral (6) view. (After 

 W. B. Carpenter.) 



PLATE 17. 



FIG. 598. Internal (ventral) view of an isolated radial of Antedon bifida &t the time of detachment from 

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



599. External (dorsal) view of an isolated radial of Antedon bifida at the time of detachment from 

 the larval column. (After 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. (After W. B. Car- 

 penter.) 



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

 penter.) 



