188 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



marginal teeth along the curved edge. In my material these did not 

 appear after the ninth parapodium. In its neuropodium the second 

 parapodium carries a tuft of rather heavy setae curved toward the 

 apices and provided with toothed plates along the apical region. 

 All of these are broken and nothing can be said about their precise 

 shape. Ventral to these is a tuft of slender colorless curved setae. 

 From the point of curvature which is near the end, two series of 

 minute teeth are continued along the border of the seta, this border 

 being at first convex and later, owing to a second bending, concave. 

 When seen in profile (fig. 9), only one row of teeth is visible. 

 In full face (fig. 10), two rows can be seen. Under the com- 

 paratively low magnification of the drawing (X 65), these teeth 

 appear as sharp spines. Under higher powers they show as small 

 plates set at an angle to the shaft, and toothed at their free margins. 

 In anterior somites these setae are inconspicuous, but behind the 

 fifth parapodium they are larger, reaching as far as the heavy 

 ones (to be described later). While the structure here remains essen- 

 tially unaltered the stalks are much longer and heavier and often have 

 a twisted or contorted appearance. 



In the neuropodium of the third parapodium are heavy setae 

 with slightly curved apices and in most cases the tip is more or less 

 frayed. In the best preserved setae the tip is smooth hence it is 

 probably that the fraying is always due to accident. They seem 

 to have quite a different form from the large ventral ones in para- 

 podium 1. In my material they occur only as far back as the 

 thirtieth somite, developing in these later somites a very marked 

 arrangement of hairlike process at the apex. (Fig. 11.) Setae of 

 a still different form begin on the ninth parapodium in the type. 

 These (fig. 12), have a slender stem with a dense tuft of bristles 

 at the apex. The basal ones of these are arranged in rows of de- 

 creasing length but terminally they form an irregular tuft. They 

 take the place of the thread-like notopodial setae of anterior somites 

 and after about somite 30, they and the toothed variety are the 

 only ones I could find. 



There is little of diagnostic value in the few elytra remaining on 

 the specimens. The anterior ones overlap on the same side of the 

 body and the first one or two may perhaps meet across the dorsum. 

 The margins are smooth but they are too much distorted by the 

 preservation to show the original form. Their color is like that 

 of the general surface of the body but no markings are to be seen 

 even under considerable magnification. 



