EUNICE FASCIATA. 



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Genus LXX. — Eunice, Ouvier, 1817. 



Head with five tentacles, cirrophore devoid of rings (Cams), two bulbous palpi, 

 the second of the first two footless segments with tentacular cirri. Foot with dorsal and 

 ventral cirri, simple dorsal bristles, compound ventral bristles, and branched or comb- 

 like branchiae. Four anal cirri. Upper jaw with teeth and fang, one plate more on the 

 left than on the right side. (Auclouin and Milne Edwards give seven plates.) Anal 

 segment with two cirri. 1 



This genus corresponds with Leodice; Leoclice simplices, Savigny; Nereidonta, Be 

 Blainville; and Eunice, De Quatrefages. Some, such as Grube, make a sub-genus 

 Leodice, Savigny, characterized by having the margin of the head bilobate and with 

 two tentacular cirri. 



The body-wall is less massive than in Lumhriconereis, the dorsal longitudinal muscles 

 especially being less compact. The nerve-area is situated immediately within the circular 



Fig. 84. — Transverse section of Marphysa sanguinea, Mont. The great size of the ventral longitudinal 

 muscles is conspicuous. The dorsal blood-vessel (above the alimentary canal) has been cut along with 

 a branch on each side. 



coat and the basement-membrane, and forms a more or less ovoid area of firm consistence 

 and with a neural canal toward the outer or ventral border. Jourdan 2 declines to 

 consider this a colossal nerve-fibre either structurally or functionally. The oblique 

 muscles pass clown laterally, some of the fibres reaching the basement membrane. 



1. Eunice fasoiata, Eisso, 1826. Plate LIV, fig. 1; Plate LXII, figs. 10 and 10 a 

 —teeth; Plate LXXIV, figs. 7-7 6— feet; Plate LXXXIII, figs. 4 and 4 a— bristles. 



Specific Characters. — Head comparatively small, bilobed anteriorly, with five 

 tentacles of a dull yellow colour with olive-brown bars which are five in number on 

 the median. Slight constrictions occur at the bars, and minute white grains cover the 



1 Benham (' Camb. Nat. Hist/) states that four are present. 

 3 ' Ann. Sc. nat./ 7 e ser., t. ii, p. 262, 1887. 



Ill 



