430 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 52. 



A well-developed parapodium has a bilobed end, the dorsal being 

 the larger of the two lobes. Into the notch between the two extends 

 the apex of a stout aciculum. Behind the lobes is a row of forty or 

 more setae. The dorsal cirrus is ovate attached by a broad cirro- 

 phore (fig. 2). In this drawing it is represented as it appeared when 

 flattened under the pressure of the cover glass. Ventral cirrus with 

 rounded ventral margin and pointed apex. 



Setae all compound; the basal portion expanded at the end, and 

 carrying at this place a dense tuft of stout spines. Terminal portion 

 slender, curved, with a row of teeth along one margin. 



Width at head, 1.25 mm.; length of head, 1.25 mm.; total width, 

 including parapodia, at somite five, 4 mm. ; total width farther back, 

 6 mm. 



Type.— Cat. No. 16831, U.S.N.M., was collected at Chame Point, 

 Panama, by Kobert Tweedlie, in 1912. 



