BRADA IRENAIA. 401 



The palpi are short, flattened and broad, widest above base and narrowing 

 to the tip, oblong-ovate. With the usual distinct longitudinal groove along 

 the ventral surface from base to tip. The tentacles have been so far rubbed 

 off that their number could not be ascertained. The mouth in the extended 

 condition of the prostomium shows as an arcuate slit, the two halves of the bow 

 being concave ventrally; the lining membrane somewhat ridged or wrinkled. 



Dorsal surface densely papillose, the papillae in the present contracted 

 condition touching each other, or nearly so. There are mostly from three to 

 five of these in the length of a somite. When extended the papillae appear to 

 be elongate, conical, or more or less flattened in the anterocaudal direction. 

 Ventral surface similarly with numerous papillae, which when extended are in 

 part elongate and more or less filiform. Sides also equally densely papillose 

 between the parapodia. 



Both neuropodial and notopodial setae in the median region are relatively 

 long and in conspicuous tufts borne each on a well-developed tubercle. The 

 notopodial setae are decidedly more slender than the neuropodials, though not 

 much differing in length. They are very fine distally, where they are curved, 

 often uncinately so. They are annulate throughout their length, excepting the 

 fine tip. They are finer and more curved on the anterior somites. The annuli 

 are decidedly longer at the base than in B. villosa, increasing in length chstad as 

 shown in the figures. (Plate 68, fig. 7-9). Neuropodial setae stout and straight, 

 ending in a transparent, abruptly more slender tip. Setae below, or proximad 

 of, tip strongly annulate. The annuli uniform or shorter distad, all relatively 

 broader and shorter than those of the notopodials. (Plate 69, fig. 1-3). Setae 

 mostly five to eight in a fascicle. 



Genital papillae between fourth and fifth somites elongate, slenderly sub- 

 conical. 



Locality. Off Panama: Sta. 3382 (lat. 6° 21' N., long. 80° 41' W.). 

 Depth 1,793 fms. Bottom of green mud. 7 March, 1891. One specimen. 



This species seems to be near B. villosa (Rathke), a form occurring widely 

 in the North Atlantic and Arctic regions and also recorded from the North 

 Pacific. A comparison with a specimen of villosa from Spitzbergen, however, 

 shows the forms to be clearly distinct in the character of the setae. In the middle 

 segments of the present species the neuropodial and notopodial setae are more 

 nearly of the same length, and the notopodials are proportionately stouter. 

 The neuropodials are decidedly longer in relation to the length and breadth of 

 the somites. A very conspicuous difference is the decidedly greater length of 

 the annuH in the setae. 



