Annelida GhjEtopoda of New Jersey. 105 



of the width of these two segments; dorsal cirri green, not quite so dark as 

 the dorsum, with a central brown spot, extending to their attachment on the 

 segments 3-9 ; after the ninth segment this marking becomes obsolete. Ventral 

 surface light green, growing darker externally, and with reddish-brown lateral 

 markings along the posterior third ; feet and ventral cirri dark green at base, 

 growing lighter further out. Anal segment brown. The general color of the 

 body in one instance was reddish-yellow ; in another all the markings were very 

 dark-brown, nearly black, in place of the umber-brown. The transverse band 

 on the eighth and ninth segments is still visible, after six months' preservation 

 in very strong alcohol. Body slightly convex above, flattened below ; the first 

 segment is much wider than the second, but shorter; the second is narrower 

 than the head ; the middle third of the body has a uniform width, about double 

 that at either extremity. 



Length of adult specimens, 10-12 mm ; width, 1.5-2 ram . 



Found occasionally at low water ; quite common on beds of Mytilus edulis. 



PHYLLODOCE (Sav.) Malmgren. 



Malmgren. Nord. Hafs-Ann., p. 94. 

 Phyllodoce arenas; n. sp. 



PLATE II, FIGS. 10-12. * 



Head bluntly rounded in front, diameter increasing backward to the middle 

 line, just back of the middle slightly constricted ; margins behind the constric- 

 tion straight ; posterior margin with a deep triangular emargination ; lateral 

 lobes broadly rounded. 



Antennae short, conical, rather stout, their length about equal to the aDterior 

 diameter of the head. 



Eyes situated at posterior third of the head, latero-dorsal, large, circular, 

 dark brown to black. 



Tentacular cirri ; first and second equal, reaching some distance beyond the 

 head ; second and third equal, about double the length of the first, reaching back 

 to the ninth or tenth segment, subulate. On the first segment, in the triangular 

 space between the posterior lobes of the head, there is a small, blunt papilla, 

 its length about equal to the base of the triangle ; this papilla is obvious in fresh 

 specimens, but is seen with difficulty in alcoholic specimens. 



Dorsal cirri of the anterior segments (fig. 10), broad heart-shaped, from the 

 twenty -fifth segment somewhat quadrangular (fig. 11), and with the inner margin 

 abruptly turned up, presenting a narrow surface nearly at right angles to the 

 larger outer part of the cirrus ; the line of union of the two surfaces is thickened 

 and densely covered with long cilia. 



Ventral cirri, lower margin conveXj upper margin nearly straight in front ; 

 they are rounded externally, pointed behind. 



Setae numerous, of one kind only (fig. 12), very long with a flexible capillary 

 termination ; the stem is roughened near the articulation by numerous projecting 



