POLYCHAETOUS ANNELIDS FROM CHINA — TREADWELL 271 



more than one-fifth the length of the prostomium and are conical in 

 outline. They are separated by more than their own diameter from 

 each other. The prostomial region is more or less distorted by the 

 partially protruded pharynx, and the palps have an abnormal appear- 

 ance due either to this pressure or to imperfect preservation. In 

 their present condition the basal joint of each palp is about half as 

 \vide as the prostomium and is much wrinkled, while the terminal 

 joint is a mere button inserted in the end of the basal (not shown in 

 fig. 19,/). The longest tentacular cirrus reaches to the third setiger- 

 ous somite, the next longest to the second, the next to about the 

 middle of the first, and the fourth is shorter than the peristomium. 

 The specimen is in the epitokous condition, which does not seem to 

 have affected the anterior region but shows first in parapodial changes 

 at the region of the twenty-fifth parapodium. 



A parapodium taken from the middle of the epitokous region (fig. 

 19, g) is 6 mm in vertical diameter. The setal portion of the noto- 

 podium ends in two lobes of which the posterior one is itself bilobed 

 and a little longer than the anterior. An acicula comes to the sur- 

 face at the ventral face of the anterior lobe, and a fan-shaped bundle 

 of setae, attached to the anterior side of the lobe near its base, cov- 

 ers the whole anterior face of the notopodium. A two-lobed "fan" 

 is attached to the posterior parapodial surface, each lobe narrowing 

 toward the end, so that as the two lie in contact with each other the 

 whole has an ovate outline. Another fan-shaped lobe covers the dor- 

 sal surface of the notopodium, its point of attachment being median 

 to that of the dorsal cirrus. The dorsal cirrus extends beyond the 

 notopodial apex and has the peculiar lobed border characteristic of 

 the epitokous phase, except that instead of being mere crenulations 

 they are eight definite rounded thickenings of the surface. The ter- 

 minal lobes of the neuropodium are quite similar to those of the noto- 

 podium except that they are larger. There is also the vertical row 

 of setae and the large anterior "fan." Attached to the lower sur- 

 face of the neuropodium is a process whose outhne might be described 

 as a distorted oblong. The ventral cirrus is about as long as the noto- 

 podium and has a broad fan attached to its base. On its dorsal sur- 

 face are two peculiar finger-shaped processes. 



Anterior parapodia (fig. 19, h) have thick, heavy dorsal and ven- 

 tral lips. The notopodium carries a posterior lobe similar in outhne 

 to the dorsal lip but is not quite so large and there is no anterior 

 lobe. The neuropodium has bilobed anterior and posterior terminal 

 hps. The dorsal cirrus is heavier than the dorsal lip, and toward the 

 apex it terminates in a very narrow portion. The ventral cirrus is also 

 heavy, its base narrower than its median portion but its apex narrow. 

 There is a single acicula in each lobe. 



