Species of British Echinodermata. 103 



to eighteen joints ; the longest of the joints about once and a 

 half as long as broad. Terminal claw curved and acute ; 

 penultimate joint without a trace of an opposing process. 

 Proximal pinnules greatly longer than those succeeding them. 

 Ovaries narrow and long, extending over more than half the 

 length of the pinnules. Groups of interradial plates occupjnng 

 the spaces between the radial axillaries. Of a rich brown or 

 reddish-tawny colour. Average size 11 inches from tip to 

 tip of the arms. This fine species is somewhat intermediate 

 in its characters between C. rosacea and C. Eschrichtii (J. 

 Miiller). Arran, N. B., Belfast [Prof. Wyville Thompson) ; 

 mouth of the Mersey {Dr. Walker),'' 



Professor Wyville Thompson and Dr. Carpenter, during the 

 investigations into the anatomy and physiology of this genus, 

 on which they have for some time been engaged, have discovered 

 the above species, which has hitherto been confounded with A. 

 rosaceus. The preceding descriptions of the two species have 

 been most kindly supplied to us for insertion by Professor Wy- 

 ville Thompson ; and we cannot sufficiently thank him for the 

 liberality with which he has foregone all personal considerations 

 in his readiness to aid in making the present paper a complete 

 record of British Echinodermata. 



The synonymy of the two species will be extremely difficult 

 to unravel ; and the names, which are here adopted, may, per- 

 haps, hereafter have to be changed. 



Antedon Sarsii (DUben & Koren). 



1844. Alecto Sarsii, Von Diiben & Koren, Ofversigt af Skandinaviens 

 Echinodermer, Kongl. Vetensk. Acad. Handl. p. 231, pi. 6. fig. 2. 



1860. Comatula Sarsii, Alder, Ann. Nat. Hist. ser. 3. vol. v. p. 74, pi. 5. 

 fig. 2. 



1862. Comatula Sarsii, Dujardin & Hupe, Hist. Nat. des Zoophytes 

 Echinodermes, p. 199. 



Perisom of the disk naked or with scattered calcareous granules. 

 Centro-dorsal plate conical, covered in every part with dorsal 

 cirrhi. Cirrhi 13-20-jointed ; the joints dice-box-formed, or 

 of much smaller diameter in the centre than at the extre- 

 mities, produced, the longest three or four times as long as 

 broad; terminal claw acute; penultimate joint with a claw 

 opposing the terminal claw, and nearly half its size. Three 

 or four proximal pinnules greatly longer than those suc- 

 ceeding them. No interradial plates. Colour dusky brown. 



This Norwegian species was first added to the British fauna 

 by my late friend Mr. Barlee, who procured a single fragmen- 

 tary specimen at Shetland, as recorded by Mr. Alder in the 

 Annals of Natural History,' Feb. 1860. In 1861 we dredged it 



