596 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



figured as if pressed against its lower surface. The large anterior 

 eyes with their latero-ventrally directed lenses occupy a considerable 

 part of the ventral surface. Posterior and ventral to these are the 

 palps with their two portions nearly equal in size, hanging down 

 so as to cover the sides of the mouth. While in the figure they are 

 shown under slight pressure, their direction is only very slightly 

 changed by it. 



The jaws have each a large terminal and five smaller lateral teeth. 

 I could discover no trace of paragraths. 



The dorsal cirri of the first seven somites are enlarged, increasing 

 successively in size until the seventh is reached (fig. 3 of the 



seventh ) . The notopodium 

 has two obtuse subequal 

 lobes, the acicula-extending 

 into a short conical lobe 

 between them. The neuro- 

 podium has a dorsal coni- 

 cal lobe, into which the 

 acicula extends, and an 

 obtuse ventral lobe similar 

 to that of the notopodium. 

 Dorsal cirrus elongated, 

 its terminal portion bent 

 and slightly flattened as 

 shown, somewhat fore- 

 shortened, in the figure. 



Setae of notopodium 

 with long " camerated " 

 shafts, the terminal joint 

 set into rather a deep 

 socket. The terminal joint 

 is long, slender, and very 

 sharp pointed, with nu- 

 merous very sharp teeth 

 along the greater part of 

 one edge. The teeth are 

 all drawn out into fine processes, which bend apically so that each 

 covers over several of those distal to it. In the ventral bundle are a 

 few similar to the dorsal and others having the terminal portion 

 short, narrow as compared with the basal joint, with one large tooth 

 at the apex and a row of very fine teeth along one margin. 



The parapodia, from eighth to fourteenth inclusive, are unmodified, 

 though the general structure of neuropodium, notopodium, ventral 

 cirri, and setae are essentially as in the seventh. The dorsal cirrus 

 is much shorter and tapers slowly to a blunt end. 



Figs. 1-4. — Xereis integer, 1, Dorsal view of 

 head X 22 ; 2, Ventral view of head X 22 ; "., 

 7th parapodiom X 45 ; 4, Sth parapodium X 45. 



