IDENTITY OF SOME MARINE ANNELIDS—-HARTMAN 135 
collar membrane. The collar, though now broken, is deep both 
dorsally and ventrally, but strongly oblique (fixed in the tube). 
The thoracic setal formula is as follows: 
notopodia with bilimbate and spatulate (fig. 15, d@) setae 
neuropodia with long handled avicular (fig. 15, c) and pennoned (fig. 15, b) setae 
The spatulate setae have a long, pointed mucro and are noticeably 
asymmetrical. Another unique feature is the long neck of the avic- 
ular setae (fig. 15, ¢) differing therein from the condition in P. 
mucronatus (fig. 15, h). 
P. elongatus is known only through its original record. 
h 
| > 
a d )) ; 2 
Ficure 15.—Species of PoraMetruus and Cuone (enlarged) 
a, h-j Potamethus mucronatus (U.S.N.M. No. 17351): a, Spatulate seta; h, hooked end of 
thoracic uncinus; 1, tip of pennoned seta; 7, long-handled thoracic uncinus. 
b-d, Potamethus elongatus (U.S.N.M. No. 5222): b, Pennoned seta; c, long-handled 
uncinus from same fascicle; d, spatulate thoracic seta. 
e-g, Chone ecaudata (U.S.N.M. No. 17319): e, Spatulate, thoracic seta; f, abdominal 
uncinus from an anterior region; g, thoracic uncinus. 
Genus CHONE Malmgren 
CHONE ECAUDATA (Moore) 
Figure 15, e-g 
Jasminiera ecaudata Moors, 1923, p. 246 (U.S.N.M. No. 17319; off Santa Cruz 
Island, Calif., in 38-45 fathoms). 
Jasminiera ecaudata was originally described with “radioles free, 
without interbranchial membrane but provided on each side with a 
narrow, free margin of increasing width and passing into the distal 
