60 THE ANNELIDA POLYCHAETA. 



against the parapodium, being not at all erected; the styles of the dorsal cirri 

 much surpassing the neuropodial setae but when laid back against the dorsum in 

 the middle region falling much short of reaching its middle line; bearing 

 numerous sensory processes which are cylindrical and transparent. (Plate 3, 

 fig. 3). 



In each branch of the parapodium there is a single yellow aciculum; this 

 is stout and long, tapering distad to an acute point; in the notopodium this 

 extends through and beyond the tip of the finger-shaped process, but it does not 

 attain the end of this process in the neuropodium. The notopodial setae are 

 rather numerous, being spread over the entire oblique surface of the process, 

 projecting ectad, increasing in length from those at the inner end to those at 

 the outer or distal; they are much shorter than the neuropodials and are mostly 

 also clearly more slender; they agree in structure with the neuropodials except- 

 ing that the short, small, apical process is normally bluntly rounded, ending 

 in a slight knob and the pectinate structures are more plate-like, and the pectinae 

 less hair-like. (Plate 3, fig. 6). The neuropodials are numerous and long; each 

 presents a long slender and smooth shaft, above which is a blade clearly, but not 

 greatly wider at its proximal end than the shaft, from which it narrows continu- 

 ously to an acute point; the blade is usually moderately curved; from the base 

 nearly to the extreme apex it bears numerous obliquely transverse rows of hair- 

 like processes; there may be fifty or more of these combs; the naked apex is 

 very short, smooth, and acute. Tips without trace of incision or accessory 

 process. (Plate 3, fig. 4, 5). The setae maintain the same structure throughout 

 the body. 



Elytrophores occur, as usual, on the second, fourth, fifth, seventh, and alter- 

 nate succeeding ones to the twenty third, on the twenty sixth, twenty ninth 

 and thirty second. They are rather prominent with a suboval scar of which the 

 smaller end is mesad. Unfortunately all the elytra are missing. 



Locality. Off Peru. Sta. 4,675 (lat. 12° 54' S., long., 78° 33' W.). Depth, 

 3,120 fms. 22 November, 1904. One specimen. 



In lacking eyes this form is like E. ahyssorum Mcintosh, the type of which 

 came similarly from a great depth (2,600 fms.) south of Australia. The latter 

 is a smaller species readily distinguished from the one above described by the 

 obvious differences in the setae. Eunoe caeca Moore is another blind species 

 which was dredged in Monterey Bay at a depth of from 861 to 1,062 fms. This 

 is a narrower species differing very conspicuously in the structure of its setae 

 as well as in the form of the prostomium, the form and proportions of the para- 

 podia, and various other features. 



