SYLLIS. 191 



1 . S. armillaris, head cordate, about as broad as long, with two 

 obtuse lobes in front ; antennae moniliform, prolonged beyond the 

 lobes ; eyes almost in a semicircle, the anterior pair widest apart ; 

 dorsal cirri moniliform, four times longer than the breadth of the 

 body. Length 2"; breadth 1'". Plate XV. a. figs. 1, 2. 



Nereis armillaris, Mull. Wurm. 150. tab. 9, f. 1-5, copied in Encyclop. 

 Method. Vers, pi. 55. f. 13-17. Turt. Gmel. iv. %&. Bosc, Vers, 

 i. 168. Blaino. Diet. cit. Ivii. Atlas, pi. fig. 2, cop. from Muller. 



Syllis armillaris, Johnston in Ann. ^- Mag. Nat. Hist. xiii. 4.'i8, and 

 XV. 145. pi. 9. f. 1, 2. Oersted, Annul. Dan. Consp. 24. f. 27, 90, 

 94 ; Groenl. Annul. Dorsibr. 29, and in Kroyer's Naturh, Tids. 

 1842, 117. 



Hab. The coralline region. 



Desc. Animal of a pale yellowish-brown colour, dusked in some 

 places from the earthy contents of the intestine, very slender, linear- 

 elongate, tapered at the tail, somewhat compressed. Head distinct, 

 small, deeply lobed in front ; the lobes porrect, papillary, coalescent 

 behind, but separated by a line from the antenniferous portion, 

 which is rounded and slightly convex. Antennae slightly tapered, 

 submoniliform, the medial originating from the vertex and rather 

 longer than the lateral. Eyes placed in a semicircle, the posterior 

 pair more approximated than the anterior. Proboscis long, the 

 outer portion shorter than the basal, smooth. Post-occipital seg- 

 ment not larger than the following, with two tentacular cirri on each 

 side, the superior longer than the inferior, submoniliform. Segments 

 very numerous, short, or about as broad as long. The foot obtuse, 

 undivided, furnished with a single fascicle of colourless bristles, 

 which are jointed and curved near the pointed apex ; the spine 

 conical, straight. Superior cirrus at least three times the breadth 

 of the body in length, becoming gradually shorter near the tail, 

 slightly tapered, submoniliform ; inferior cirrus not projecting much 

 beyond the foot, conical, undivided. Styles of the tail elongate. 



Length 2 inches ; breadth about a line. 



This worm is not uncommon. The specimen figured was found 

 among some shells and stones which had been brought up from deep 

 water by the hues of the fishermen. It may be compared, so far as 

 external appearance goes, with the subterranean Geophilus ; its 

 motion is moderately quick, and effected in the usual way. 



To the Syllis monilaris of Savigny this species is evidently nearly 

 allied, and indeed I find no characters to distinguish it excepting 

 the deeply-lobed front, and the greater comparative elongation of the 

 superior cirri, which, in the figure of S. monilaris given by Audouin 

 and Edwards {Hist. nat. du Litt. cle la France, ii. pi. 4 B. figs. 1-5), 

 scarcely exceed the breadth of the body. By the same characters 

 S. armillaris is separated from the S. fulgurans. I have no oppor- 

 tunity of comparing ours with figures of any of the other species of 

 the genus indicated by Audouin and Edwards. Miiller's figures of 

 this species are very good. 



Any one acquainted with Annelides will at once be led, from their 



