ARCTIC SEA TO THE WEST OF GREENLAND. 75 



pinnule at the commencement of the series. The ovarial sacs attached to the pinnules 

 are large and thick a circumstance which, in conjunction with the closeness of the 

 pinnules to one another, adds to the compact and dense character of the plume as a 

 whole. 



The dorsal cirri are long and robust; and the joints are slightly compressed. Con- 

 siderable variation occurs in the length and in the number of the joints. A long 

 example measuring 60 millims., contained 42 joints ; and another, on the same specimen, 

 about half that length, had 32. The longest joints, which commence at about the 

 12th from the base, are twice as long as broad, and are somewhat dicebox-shaped, 

 the proportion of length to breadth diminishing rapidly towards the extremity. The 

 terminal joint consists of a robust claw as long as the preceding joint ; the penultimate 

 joint bears no secondary claw, but simply has the margin thickened and produced into 

 a sharp angle a development which also occurs to a certain extent on several of the 

 preceding joints. 



Locality. Franklin-Pierce Bay (Feilden). 



Description of the Illustrations of this Species on Plate VI. 



Fig. 1. Antedon Eschrichtii : natural size. 



2. Diagrammatic sketch of the radial plates. 



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



4. A first pinnule : magnified. 



ANTEDON CELTICA (Barrett], Norman. Plate VI, figs. 5 & 6. 



1857. Comatula Woodwardii, Barrett, Ann. & Mag. Nat. Hist. ser. 2, vol. xix. p. 32, pi. vii. f. 1 (non 



Forbes). 



1857. Comatula celtka, Barrett, Ann. & Mag. Nat. Hist. ser. 2, vol. xx. p. 44. 

 1865. Antedon celtieus, Norman, Ann. & Mag. Nat. Hist. ser. 3, vol. xv. p. 104. 

 1877. Antedon celtkus, Marenzeller, Denksch. k. Akad. Wissensch. Wien, Bd. xxxv. p. 24 (separate copy). 



Dorsocentral semiglobular or hemispherical, and somewhat flattened*. Sixty 

 to seventy cirrus-pits may be traced on the specimens under notice. A cirrus 

 measuring 40 millims. in length has 38 joints: these are somewhat flattened; and the 

 longest occurs at about the 9th or 10th, which is twice as long as broad this propor- 

 tion gradually decreasing as they approach the extremity, where the breadth is greater 

 than the length. The terminal joint is a robust claw, longer than the preceding joint, 

 which has the opposed margin angulated and sharpened, but not enough to form a 

 secondary claw. In the smaller cirri, however, this sharpened joint is more con- 

 spicuous. In the shorter cirri, which are scarcely half the length of those above 

 mentioned, the average number of joints is about 25, and the distal extremity of each 

 joint is broader than the proximal which next succeeds, in a more marked degree than 

 in the older cirri. 



* Mr. P. Herbert Carpenter has figured and described this piece as elongate and conoid in young spe- 

 cimens (Trans. Linn. Soe. Zool. ser. 2, vol. ii. p. 61, pi. iv. fig. 8). No trace of this shape remains in our 

 examples, which measure about 135 millims. in length. 



L2 



