REPORT ON THE ANNELIDA. 
151 
tetragona. They proceed from the superior lobe in a fan-shaped manner, and show the 
usual whorls of spikes. 
The bristles of the inferior division may be grouped, as in Sigalion, in three sets, 
a superior, middle, and inferior. The superior and inferior are more slender, especially 
the latter, and have a much more elongated tapering tip, which presents more minutely 
marked canaliculi (PI. XIIIa. fig. 19). Unfortunately very few of the tips of the median 
bristles (PL XIIIa. fig. 20) are discoverable, the majority having fallen off, so that the 
series usually presents a truncated brush-like margin in the anterior region. 
In transverse section the body-wall agrees for the most jDart with Leanira tetragona, 
as shown by Dr. Hansen.’- The cuticle is somewhat thick ventrally, and the hypoderm 
is thin. The ventral longitudinal muscles are folded externally and superiorly, and in 
some there wmuld appear to be a faint spiral arrangement. No fold exists in the 
dorsal longitudinal muscles. The nerve-area is covered by the oblique and vertical 
muscles. The cords are somewhat flattened or ovoid, and in some preparations a median 
canal inferiorly is indicated, but the specimen is too imperfectly preserved for minute 
characters. The proboscis presents the ordinary structure, and in extrusion still keeps 
cuticle and hypoderm internal, with the radiate coat external. The ridge at each pole is 
well marked. 
Leanira areolata, n. sp. (PI. XXL fig. 3 ; PL XXV. figs. 8, 9 ; PL XIIIa. fig. 1). 
Habitat. — A single complete specimen was procured at Station 232 (south of Yedo, 
Japan), May 12, 1875; lat. 35° 11' N., long 139° 28' E.; depth, 345 fathoms; bottom 
temperature 41°T, surface temperature 64° ’2 ; sea-bottom, green mud. 
The example is about 150 mm. in length, and its diameter at the thickest part 
anteriorly is 9 mm. 
The head (PL XXL fig. 3), as in the former case, is eyeless and mottled in the same 
peculiar iridescent manner. The tentacle is attached to a somewhat conical base which 
comes from the front of the head. On each side of the base is a small spathulate process. 
The tentacular cirri do not present any feature of note. The palpi are long, smooth, and 
delicately tapered. 
The first scale is small, rounded, and quite smooth. It presents the same granular 
nervous mass and ramifications as in the succeeding. They rapidly increase in size, and 
in the preparation almost cover the dorsum anteriorly. They are soft, whitish, slightly 
translucent, and anteriorly quite smooth on both surface and margin. Behind the anterior 
third the fold on the outer margin presents a series of simple and very slightly tapered 
papillae (PL XXV. figs. 8, 9), and since they are usually invisible on running the eye 
round the margin, they have as a rule to be looked for carefully. Minute examination, 
^ Anat. von Leanira tetragona, Archiv f. Math, og Naturmdenskah., Christiania, 1878. 
