316 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



at the posterior end of the fragment it has narrowed to 4 mm. The 

 prostomium is a trifle more than 1 mm. in diameter. The anterior 

 20 mm. of the body has a decided purple tint, and behind this region 

 it is light brown with a darker median line. The ventral surface is 

 divided by two parallel lines into a median narrow stripe with a 

 broader area on either side. Where the cuticle is intact, this surface 

 has a bluish-gray tint. When the cuticle is removed the body sur- 

 face is a uniform light brown. 



The prostomial width is about twice that of its length, its two 

 halves separated by a depressed area and, owing to the rounding of 

 all angles, each half is nearly circular in outline. No eyes are 

 visible, but ill-defined pigment patches occur where eyes should be. 

 The two tentacles arise very close together on the anterior prostomial 

 margin. (Fig. 2, a.) They are long, slender, and sharp-pointed, 

 approximately three times as long as the prostomium. Only one 

 palp is preserved, and this is narrow at the base, widening abruptly 

 to a diameter more than twice that of its base and retaining this 

 width for half its length and then narrowing rapidly to an acute tip. 

 Its total length is more than three times that of the prostomium. 

 The single remaining tentacular cirrus is very slender and almost 

 equal to the palp in length. The cirrophores of the tentacular cirri 

 and the dorsal surface of the prostomium are pigmented similarly 

 to that of the dorsal surface of the first somite. The palp, tentacles, 

 and styles of the tentacular cirri are all colorless. 



Elytra are carried on somites 1, 2, 3, 6, and 8. In this specimen the 

 anterior ones are badly rolled, and it is not possible to determine 

 their normal form. Those farther back are ovate, with the broader 

 end turned toward the dorsal surface of the body. They are nearly 

 colorless, but there is a little more pigment in their dorsal than in 

 their ventral portions. This, together with the fact that the body 

 wall shows through the elytron, and this wall is darker dorsally than 

 laterally, makes the distinction between the two ends of the elytron 

 seem more marked than it realty is. The margin is entire. A nar- 

 row band inside the margin has a finely granular appearance, and the 

 whole surface inside this is divided by intersecting lines into angu- 

 lar areas, the whole having a strong resemblance to a cross section of 

 a stem of a maize plant. Irregularly shaped spots of pigment are 

 scattered along the intersecting lines. 



The protruded proboscis has a row of six fleshy lobes on either 

 side of the dorsal surface of its end. A similar lobe, but bifurcated, 

 lies in the mid-dorsal line. There are seven or eight lobes on either 

 side of the ventral margin. The jaws are two sharp, brown teeth, 

 above and below. 



The parapodium (fig. 2, b) has a fleshy setal lobe, with a heavy 

 acicula reaching its surface at about its middle, where there is a 



