EEPOllT ON THE ANNELIDA. 
307 
Nothria tenuisetis, n. sp, (PL XL. figs. 8, 9 ; PL XXIa. figs. 24—26). 
Habitat. — Trawled at Station 169 (off East Cape, North Island, New Zealand), 
July 10, 1874; lat. 37° 34' S., long. 179° 22' E. ; depth, 700 fathoms; bottom tem- 
perature 40°'0, surface temperature 58°'2 ; sea-bottom, blue mud. 
A species of considerable size, measuring in its incomplete state 105 mm. in 
length, and having a diameter, at its widest part in front, of about 3 mm. 
The head (PL XL. fig. 8) is eyeless. Anteriorly are a pair of frontal tentacles not 
unhke those of Hyalinoecia tuhicola. The other tentacles are of considerable length, 
similar, though proportionally longer and more slender than in the species just 
\J 
Fig. 65. 
Fig. 63. — Maxillse and dental plates of Nothria tenuisetis ; x 20 diameters. 
Fig. 64. — Ventral view of tlie cutting edges of the mandibles of the same ; x 20 diameters. 
Fig. 65. — Dorsal view of one mandible ; x 20 diameters. 
mentioned. The ringed basal region in each is also somewhat longer. The tentacular 
cirri are slender and filiform, and extend beyond the frontal region. The two palpi 
correspond in size with those of Nothria conchylega. 
The dental apparatus (Fig. 63) is of a dull straw colour, with brown bands and lines 
along the margins. The flattened posterior region of each maxilla is pale, the anterior 
brownish. The lateral curvature of the limb is well marked, but only a slight dip 
(downward) occurs in front of the transverse line. The shape of the posterior processes 
differs in the two examples. In the most perfect the processes are constricted benind 
the transverse line of the maxillae, then bulge outward and form a rounded extremity 
with a median notch. The posterior margin and side are tipped with dark pigment, 
leaving a symmetrical and somewhat triangular median region on each side. In the 
other example the outer dark region just described extends further forward, and is 
