ART. 26 TWO NEW POLYCHAETOUS ANNELIDS TREADWELL 5 



The compound setae (fig. 9) are stout, the apical joint having 

 blunt apical and subapical teeth. There is a row of denticulations 

 along the margin of the shield. The pectinate setae (fig. 10) are few 

 in number in each somite and rather small. At the apex there are 

 10 teeth, of which the one at one end is much longer than any of the 

 others. The simple setae are long and of the usual structure, with 

 very minute striations along the margin. The jaw is sepia-colored, 

 "with very dark margins to the plates. The carrier is short, triangular 

 in outline, with lateral lobes, the forceps rather heavy. (Fig. 11.) 

 The right proximal paired plate has six teeth, the left has five. The 

 right distal paired plate has nine, the left has seven, the unpaired has 

 seven. Beyond each distal paired plate is a very dark triangular patch. 

 The shafts of the mandibles are slender, sepia-brown in color, the 

 terminal plate rather large and white. (Fig. 12.) The three frag- 

 mentary specimens may be considered as the co types of the species 

 (Cat. No. 19280, U.S.N.M.) (Felippone No. 3008). They are from 

 Mar del Plata, Argentina. 



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