2 PROCEEDINGS OF THE NATIONAX, MUSEUM. vol.64. 



The appearance of somite 1 varies with the degree of protrusion 

 of the pharynx, for in some specimens it was very much narrower 

 than somite 2 while in others it was more as is represented in Figure 

 1. In most cases tliere is a gradual slope backward from the anterior 

 border of somite 1 to that of somite 2. It is short as compared with 

 other species of this genus, being never more than one-third its 

 length longer than somite 2. Somite 2 gradually widens to somite 3, 

 and this increase continues to the region of somites 6 to 8. The dis- 

 tension of the body with sex products or its collapse after they are 

 extruded make measurements behind this region of little value. 



In life the dorsal surface must have been dark brown in color. In 

 the preserved material the dorsal surface of the prostomium, palps, 

 and anterior somites, and the ceratophores of the tentacular cirri are 

 dusky brown. The remainder of the body is colorless. A row of 

 clear spots runs across the dorsal surface of each somite a short dis- 

 tance posterior to its anterior margin. 



A parapodium from the anterior region of the male is shown in 

 Figure 2. On the notopodium are two cirruslike lobes, one above and 

 one below, and a cirruslike presetal lip. The dorsal cirrus is rela- 

 tively smaller than in many heteronereids and has the characteristic 

 swelling toward its apex. In the neuropodium there is a cirruslike 

 postsetal lobe and an asymmetrically pointed anterior one with a 

 larger triangular lobe ventral to these two. The ventral cirrus is 

 very small and placed near the base of the parapodium. There is a 

 single black acicula in each half of the parapodium. 



A parapodium from the sexual region of the male (fig. 3) has in 

 the notopodium two cirruslike presetal lobes, the postsetal being short 

 and rounded. On the dorsal surface is a rounded flat lobe, and the 

 dorsal cirrus arises between the base of this and the dorsal one of 

 the two presetal lobes. It has about ten lobulations along its ventral 

 border. The neuropodium has two presetal lobes, one broad and fan- 

 shaped with a deep notch in the dorsal border of its base, the other 

 much more slender and cirruslike. On the ventral border of the neu- 

 ropodium are two lobes, of which the ventral one is the larger and 

 the ventral cirrus arises between the two. It is much smaller than 

 the dorsal cirrus and lobulated along its dorsal border. 



The parapodia of the female agree in general with those of the 

 male, except that all lobes and lips are heavier and blunter. In the 

 anterior region the dorsal cirrus does not have the expansion toward 

 the apex, but is uniformly tapered. 



In the anterior region of the male are two kinds of setae, both 

 compound. One form (fig. 4) has a very long slender terminal 

 joint, toothed along one margin. These make up all of the noto- 

 podial tuft, and the dorsal and ventral parts of the neuropodial. In 



