78 ON THE ECHINODERMATA OF THE 



41 pinnules are present on one side of the longest unbroken ray, which measures 

 86 or 87 millims., a little portion of the extremity being wanting. From the axillary 

 radial to the third syzygy measures 14 - 5 millims. The first pinnule measures 10 millims. 

 long, with 26 or 27 joints ; the second is very short, being only 3 -25 millims., and has 

 11 joints ; the third is 5 millims., with 11 joints ; the tenth 8 millims., with 12 joints ; 

 the twentieth about 14 millims., with 19 or 20 joints. In another example the first 

 three pinnules have 22, 15, and 14 joints respectively. 



The joints of the pinnules are cylindrical and very long, excepting the first six of 

 the first pinnule, which are little longer than broad, and slightly compressed ; and the 

 three or four lowest joints in the second and third, which are also short and somewhat 

 flattened, and diminish rapidly in breadth at their distal extremities. The second joint 

 of the pinnules along the ray is broad and robust in comparison with the rest ; and the 

 proximal extremity is truncated on either side, so as to form apparently two sloping and 

 converging facets for the reception of ligament : owing to this circumstance, and also 

 to the mode of their attachment, the pinnules have the semblance of being placed 

 transversely upon the first joints ; and this presents a striking character about the 

 middle of the ray. Ovarial sacs fine, delicate, and chiefly developed on the proximal 

 third of the pinnule. 



Remarks. The present species more nearly resembles A. phalangium, Miiller, of 

 the Mediterranean, than any other Comatula with which the writer is acquainted. 

 That it is distinct, however, from that form will readily be seen from the preceding 

 description. It is altogether different from its Arctic congeners. 



Locality &c. All the specimens of this species were dredged by Capt. H. W. Feilden 

 during the British Arctic Expedition of 1875-76, in Discovery Bay, lat. 81 41' N., 

 depth 25 fathoms, hard bottom. Antedon celtica was also obtained in company with 

 them. 



Description of the Illustrations of this Species on Plate VI. 



Fig. 7. Antedon prolixa : natural size. 



8. Diagrammatic sketch of the radial plates. 



9. Extremity of one of the dorsal cirri : magnified. 



10. Joints with pinnules attached, from near the middle of a ray : magnified. 



