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224 MAGELONA PAPILLICORNIS. 



1894. Magelona <pajpillicomis } Mcintosh. Quart. Journ. Micr. Sci., vol. xxxvi, n.s., p. 76, pi. viii, 



figs. 1—3. 

 F. Buchanan. Eep. Brit. Assoc, for 1895, p. 469. 



'cornis, Benham. Quart. Journ. Micr. Sci., vol. xxxix, n.s. ; No. 153, p. 2. 

 Mesnil. Bull. sc. Fr. Belg., t. xxix, p. 257, pi. xiv, figs. 27—33. 

 De St. Joseph. Ann. Sc. nat., 8 e ser., t. v, p. 354, pi. xx ; f. 166. 

 Allen. Journ. M. B. A., vol. vii, n.s., p. 228. 

 Percy Moore. Proc. Acad. Nat. Sc. Philad., vol. lix, p. 204. 

 Fauvel. Bull. Inst. Ocean., 142, p. 5. 

 Lo Bianco. Mitt. Zool. St. Neap., Bd. xix, p. 581. 

 Elwes. Journ. M. B. A., vol. ix, p. 62. 

 Mcintosh. Ann. Nat. Hist., ser. 8, vol. vii, p. 417. 

 Southern. Proc. Roy. Irish Acad , vol. xxxi, no. 47, p. 105. 



Habitat. — Soutliport sands near low water (Dr. Carrington and W. 0. M.) ; in sand at 

 extreme low water, St. Andrews, in abundance, and also dredged off the East Rocks 

 on a bottom — where Lanice conchilega abounds. At Soutliport not only that species, but 

 Oivenia fusifornis and Valenclnia armandi accompanied it. Plymouth (F. Buchanan and 

 Allen); Torquay (Elwes); Blacksod Bay (Southern). It is probably generally dis- 

 tributed around our shores in suitable localities. 



Abroad it has been obtained in the Island of St. Catherine, Brazil (Fritz Miiller) ; 

 Channel shores of France (Claparede, Giard, Mesnil, and De St. Joseph) ; America ? 

 (Webster and Benedict). 



Head (Plate XC, fig. 6 ; and Plate CI, fig. 2) spatulate, very much flattened from 

 above downward and thinned at the edges, which are marked by a beautiful series of 

 somewhat radiate pale lines, which anastomose with each other at the free border. Two 

 strong muscular bands proceed from the tip of the snout backward along the centre, the 

 outer being mainly longitudinal, though distinct transverse fibres are present, and pass 

 the mouth. The fibres of the inner band on each side are directed inward anteriorly, 

 forming long oblique fascicles, but toward the mouth the obliquity is much greater, 

 though the direction is the same, viz. backward and inward. A large blood-vessel — 

 appearing in some cases double— runs forward between the outer and inner bands. The 

 tissue between the meshes of the blood-vessels at the margins of the snout is cellulo- 

 granular — probably mainly hypodermic. 



This great flattened ovate snout continues backward to form a roof or shield to the 

 peristomial segment beneath it, a condition by no means common in the group, yet it would 

 appear to be a modification of the prostomium observed in Polydora and other Spionidse. 



The tentacles spring from the peristomium considerably in front of its posterior 

 border and beneath it, and are remarkable organs of great length. The papillae are 

 arranged in a double row. No cilia occur on them. 



The mouth opens on the ventral surface, also in front of the posterior border of the 

 dorsal plate of the prostomium. From the mouth projects in many preparations the 

 more or less rounded mass of the proboscis, which at intervals, moreover, is thrust out in 

 the living form, and the organ has a series of regular frill-like striations. In the gut are 

 mud and diatoms. 



The body extends to 6 — 7 inches, or even more in length, and consists of two well- 



