ARCTIC SEA TO THE WEST OF GREENLAND. 77 



Mr. P. Herbert Carpenter (loc. cit.) has entered with great care and detail into 

 certain parts of the anatomical structure of a Comatula referred to under this name ; 

 but no other writer, excepting those mentioned above, appears to have spoken of 

 A. celtica from a systematist's point of view*. 



Locality, &c. Discovery Bay, lat. 81 41' N., 25 fathoms, hard bottom (Feilden) ; 

 Franklin-Pierce Bay. 



Description of the Illustrations of this Species on Plate VI. 

 Fig. 5. Antedon celtica : natural size. 



6. Diagrammatic sketch of the radial plates. 



ANTEDON PEOLIXA, Sladen, sp. nov. Plate VI, Figs. 7-10. 



Dorsocentral very conoid, as long as, or longer than, broad, with four or five tiers 

 of cirri arranged one above the other, about 60 to 70 all together being present ; 

 the apex having no pits, and presenting the appearance of a sort of tubercular boss. 

 The cirri are remarkably long and delicate one, with the extremity missing, measuring 

 58 millims. Another, 47 millims. long, has forty joints; and this appears to be the 

 average length and number. One of the small cirri (which is 21 millims.) has twenty- 

 nine joints. The joints of the cirri are very long and cylindrical, but narrower in the 

 middle than at the extremities; the eighth from the basal joint measures 1*76 millim. 

 long and '43 millim. broad, or four times as long as broad ; the terminal joint is 

 modified into a delicate claw ; and no actual secondary claw occurs at the extremity of 

 the penultimate joint, only a slightly produced triangular peak. 



The first radial is not visible in front, only at the extreme sides, where it may be 

 seen rising up towards the interior. The second radial is of moderate length, nearly as 

 long at the sides as broad, and is not much (if at all) constricted at the distal extremity. 

 The third or axillary radial is very regularly quadriform, placed diamond-wise (the 

 length being about equal to the breadth), and with all the sides incurved. The first 

 brachial is comparatively long ; the second longer than broad, and subtriangular in 

 profile from the outside, the proximal angle remaining in a much more lateral position 

 than in either of the preceding species ; the third brachial, which bears the first syzygy, 

 is as long as, or longer than, broad; and the succeeding joints of the ray are all 

 comparatively long, and increase in relative length towards the extremity of the ray. 

 Syzygies occur normally on the 3rd, 8th, 12th, and every third joint beyond. 



On the whole it may be said that the radials stand very high in this species, and 

 that the rays spring off from them well separated into pairs the rays being comparatively 

 thin and delicate in habit, and the pinnules being seemingly placed wide apart, in 

 consequence of the length of the joints. 



* Since -writing the above, we have had the opportunity of examining specimens which we owe to the 

 kindness of Sir Wyville Thomson, and which he, in common with other British naturalists, has been in the 

 habit of regarding as the representatives of A. celtica. They are altogether different from the Comatula here 

 described, and resemble to a certain degree the form that we have named A. prolira, but from both of which 

 they arc, in our estimation, a perfectly distinct species . 



