S26 ANNELIDA FROM BERMUDA. 



forms shown in Figs. 73 and 74 ; these are arranged in two long series, 

 ^fter the change of seta? (i. e., on the abdominal segments) the uncin:"' 

 xemain without modification (Figs. 73, 74); the ventral rami carry a 

 few very long capillary setae (Fig. 71), and others with dilated end, 

 from the dei^ressed summit of which ^arises a very delicate capillary 

 :iippendix or apex (Fig. 72); further back both kinds of ventral sette 

 ibecome somewhat elongated, and, in i)articular, the capillary termina- 

 tion of the setfe with expanded ends doubles in length. 



The body is convex above, flattened below ; of uniform width for the 

 :anterior four-fifths, falling off gradually along the posterior fifth to one- 

 lialf the anterior width. 



The base and cirri of the branchiae are purple, except the base of the 

 .superior cirrus on each side, which is white; i^innre, to the outer margin 

 'Of the connecting membrane, purple; then, for a short distance, white; 

 next, for a longer distance, purple; followed by another short white 

 series. Terminal pinnae, purple; naked terminal part of cirri, colorless. 

 Where the ijifinte are white the sides of the cirri are also white, but the 

 dorsum of the cirri is always purple. Young specimens have the cirri 

 mmber-brown or brown, with a tinge of purple; innnsB colorless, white 

 «or greenish-white. The first segment has its anterior margin white ; 

 •dorsum and sides dark umber-brown ; ventral surface, for anterior two- 

 rthirds same as the dorsum, then a naiTow white line, while the ])osterior 

 part of this surface is dark flesh-color. Eemaining thoracic segments, 

 umber-brown; dorsal -rami of this part of the body, dark flesh-color. 

 Abdominal segments light flesh-color. On the anal segment two umber- 

 ^rown spots (I eyes) which cannot be made out in preserved specimens. 



This species forms a very tough membranous tube. The description 

 given above is largely drawn from notes on specimens found at Beau- 

 fort, N. C, in 1876, by the Union College zoological expedition of that 

 year. Most of the specimens found at Beaufort had their tubes im- 

 33edded in fragments of a soft oolite just below low- water mark. Two 

 specimens were found with these tubes attached to shells. 



A specimen with something over a hundred segments, measured 

 u\'hile living, gave — 



Length, 26'""\ 



Ureadth, 2""". 



^rom front margin of collar to tip of branchiae, 5™°^. 



Another specimen: 



Xength, SO-"™. 



Breadth, SS-""". 



