AKT. 1 NEW ANNELIDS FROM CHESAPEAKE BAY TREADWELL 5 



In anterior somites the setae of the dorsal tuft are all very long 

 and slender and much curved, the longest lying at the top of the tuft 

 and reaching beyond the base of the gill. Those of the ventral tuft 

 are shorter than the dorsal but resemble them in other respects, but 

 they curve in the opposite direction. On the ninth setigerous somite, 

 hooded setae appear accompanied by slender simple ones. These 

 hooded setae have a double hood, the double character, however, not 

 being visible except when seen in full face. Each has a large sub- 

 terminal tooth with a row of three much smaller ones beyond it. 

 (Fig. 3, d.) Toward the posterior end of the body the dorsal setae 

 are very few in number and are much elongated, some resembling 

 those of the notopodium in the anterior somites, while others are 

 hooded and resemble in form those of the neuropodium of the an- 

 terior somites. None of this material was sufficiently well preserved 

 to allow of any accurate description of the posterior end. 



In the form of the prostomium with its underlying prolongation 

 from the under side of somite 1, this species resembles Strehlospio 

 henedicti of Webster, but lacks the prominent hoodlike structure on 

 the dorsal surface of the second setigerous somite, which character- 

 izes that species. The dorsal cirri are much more prominent in 

 P. -plwnosa^ while in Strehlospio the margins of the gills are crenu- 

 lated but never lobed. 



The holotype (U.S.N.M. No. 19598) was taken at Station 8881, 

 October 19, 1920, while other specimens were taken at Stations 8848, 

 8875, 8876, 8878, 8882, and 8887, ranging through the lower middle 

 bay from the mouth of the Patuxent River to the mouth of the Rap- 

 pahannock River, in depths of from 7.32 to 47.58 meters, August 22 

 to October 19, 1920. 



n. S. GOVERNMENT PRINTINS OFFICE: 19JI 



