2 PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



prostomium. It tapers very gradually to the apex, which is badly 

 preserved, so that its precise form is uncertain. The tentacular cirri 

 are shaped much like the lateral tentacles, and the ventral ones are 

 about equal to them in length. 



There are 21 pairs of elytra. The first pair are large, broadly 

 oval in outline, and apparently in life completely cover the prosto- 

 mium. Elytra 3 to 7 leave uncovered a considerable dorsal area in 

 this preserved material, and it looks as if this holds true for the living 

 animal as well. Behind the region of the eighth elytron the dorsal 

 body surface is completely covered by the elytra. The last elytron 

 is on the fourth somite from the pygidium. All elytra are similar in 

 outline (fig. 2), and all are irregularly blotched with pigment. When 

 the pigmentation is dense the point of attachment of the elytro- 

 phore shows as a prominent white spot. In all cases this place is 

 free from pigment, but when the pigment is more diffuse it is contin- 

 uous with other unpigmented areas and hence is less prominent. The 

 pigment is in small patches which may show as colored spots each 

 with a colorless center, or the patches may be in contact, in which 

 case the pigment is continuous with scattered white spots in it. The 

 elytra toward the anterior end of the body have a few short marginal 

 cilia, but I was unable to find any on those toward the median and 

 posterior regions. Near the lateral margin of the elytron, and visible 

 only under considerable magnification, are small blunt spines. For 

 a certain distance these are arranged in a double row parallel with the 

 elytron border, while others are irregularly scattered over the surface. 

 They are not shown in Figure 2 because not visible at the magnifi- 

 cation at which that was drawn. 



The dorsal cirri are throughout equal in length to about one-half 

 the body diameter. At the apex each tapers abruptly to an acute 

 tip without any subterminal swelling. There evidently was in life a 

 subterminal band of pigment. The posterior cirri are stouter than 

 the others but similar to them in other respects, and the anal cirri 

 resemble the last pair of dorsal ones. 



A parapodium (fig. 3) has a stout neuropodium, with very little 

 distinction between anterior and posterior Ups. The notopodium is 

 globular in outline and is very small. The cirrophore of the dorsal 

 cirrus is longer than the notopodium and its style extends for fully 

 three-quarters of its length beyond the apex of the neuropodium. 

 Each lobe of the parapodium has an acicula. The dorsal setae are 

 of two kinds. The first (fig. 4) are stout and short, hardly extending 

 beyond the notopodial apex. The shaft curves and narrows to an 

 acute tip and there are rows of teeth along the convex margin. 

 These setae form a fan-shaped bundle. The second kind are much 

 longer and more slender, but carry a similar equipment of teeth 

 (toothed plates). (Fig. 5.) The ventral setae (fig. 6) are very much 



