EXPLANATION OF THE PLATE. 



Figs. 1-6. Atelecrinus balanoides nov. gen. & sp. 



Fig. 1. The best specimen obtained (No. 151, off Nevis). The first pinnule visible 

 is on the 13th brachial, that borne by the 12th brachial being on the 

 opposite side of the arm, and therefore out of sight. X 4. 



Fig. 2. Portion of an arm between the 10th and 18th joints, showing the absence of 

 pinnules as far as the 11th joint (inclusive). X 4. 



Fig. 3. Side view of the calyx of another specimen. X 8. 



Fig. 4. Radials and basals from beneatb. The minute processes at the central ends 

 of the basals are omitted. X 10. 



Fig. 5. The centrodorsal from above. X 10. 



Fig. 6. A single basal (without its central processes), a. From the outer side. 

 b. From above. X 14. 



Fig. 7. Atelecrinus cubensis. Pourt. sp. A single specimen dredged by Mr. Pour- 

 tales, in 1869, off Cojima, near Havana, in 450 fathoms. X 8. 



Fig. 8. Antedon columnaris n. sp. No. 222, off St. Lucia. X 4. 



