KEPHTYIDAE FROM NORTHEAST PACIFIC — HARTMAN 



155 



Setal fascicles not conspicuous, containing only simple capillary, 

 simple bristled and simple barred setae. Setae few in fascicles, 

 projecting laterally in stiff series. 



Named for E. F. Ricketts, who has made numerous collections of 

 annelids from the northeast Pacific. 



Eohfype.—U.S.^M. no. 20322. 



Distribution. — Cache Bay, Alaska (type), collected by Mr. Rick- 

 etts, with an individual of N. caeca (Fabricius). Albatross station 

 2902 (1889), off Santa Rosa Island, in 53 fathoms. 



Systematic position. — N. richettsi has affinities with the N . caeca 

 group. It differs from the latter or closely related species in (1) 

 the distribution of its recurved cirri, which are first present on 

 the sixth setiger and absent from about the last 15 or more setigers ; 

 (2) in the shape of its recurved cirri, especially those of the posterior 

 half of the body, these being inflated, sacklike; (3) in the nature 

 of the parapodial lamellae, which are thicker, tougher; and (4) in 

 the posterior acicular lobes which are not noticeably bilobed. 



Figure 67. — Nephtys punctata, new species : a, Sixth parapodium in anterior view, ventral 

 cirrus omitted ; 6, twenty-fifth parapodium in anterior view ; c, parapodium from 

 median region, in anterior view ; d, twentieth last parapodium, in anterior view. 



NEPHTYS PUNCTATA, new species 

 FiGUBE 67 



Length to 100 mm; width to 6.5 mm at tenth setiger or widest part; 

 number of segments 90 to 100. Closely resembling N. caeca (Fabri- 

 cius) in size and body proportions. 



Prostomium rectangular, slightly longer than wide, with a circular 

 depression at its median, posterior margin ; nuchal papillae circular, 

 inserted at postectal margin of prostomium; ventral antennae more 

 than twice as large as dorsal antennae. 



