ABT. 1 



NEW ANNELIDS FROM CHESAPEAKE BAY TREADWELL 



tentacular cirri are shorter than the tentacles but in other respects 

 agree with them in appearance. The ventral tentacular cirri (not 

 shown in the figure) are short, and though a little longer than the 

 dorsal cirri they resemble them in form. 



The second somite has a tuft of compound setae and a long dorsal 

 cirrus, which is similar to the tentacles in form but longer than they 

 are. All other dorsal cirri are short, oval, and leaflike in outline. 

 The pygidium (fig. 2, 5) has the form of a thin, flattened lip, with 

 3 rounded posterior margin broader than the terminal somites. The 

 anal cirri are shaped like the dorsal ones but are larger than any 

 of them. Because the dorsal cirri of the shortened posterior somites 

 are smaller than those farther 

 forward, the anal cirri are very 

 prominent. 



The esophagus is narrow, has very 

 dark-brown walls, and is bent on 

 itself so that although the loop ex- 

 tends into somite 3, it opens into the 

 pharynx in somite 2. The phar- 

 ynx extends through about three 

 somites, and the remainder of the 

 canal behind this is very broad. 



The parapodia are without ven- 

 tral cirri. In the setal portion are 

 a presetal and a postsetal lobe with 

 the tuft of setae protruding be- 

 tween them. These lobes are 

 approximately equal in size and 

 are rounded at their apices. The 

 setae have very minute terminal joints (note the scale of the drawing 

 in Figure 2, c). each roughly triangular in outline with a slender 

 terminal and a much stouter subterminal tooth. 



The holotype (U.S.N.M. No. 19603) was taken at Station 8828, 

 July 8, 1920, near the mouth of Chesapeake Bay, in 16.47 meters. 

 Others were taken at Stations 8826, 8827, 8840, 8829, and 8985 in 

 the same locality in depths varying from 18.03 to 45.75 meters, July 

 8 to August 22. 1920. and April 2, 1921. 



Figure 2. — Myriana cirrata, uew species : 

 a. Anterior end, X 68 ; b, pygidium, X 

 68 ; c, seta, X 563 



Family SPIONIDAE 



PRIONOSPIO PLUMOSA, new species 



Figure 3 



The largest specimens in the collection were 15 mm. long, but in 

 none was the posterior end well preserved, so that they may have 

 been longer when alive. The greatest width near the anterior end 

 was 0.6 mm. 



