54 
AUSTRALASIAN ANTARCTIC EXPEDITION. 
The eyes are brown; the median tentacle springs from the dorsal surface in front 
of the level of the eyes ; it is more slender than the anterior tentacles, and about as long 
as the length of the prostomium. The two pairs of anterior tentacles have the usual 
position and shape, and are shorter than the median. 
The first segment is distinct dorsally, behind the prostomium, and is of the same 
width. It bears on each side one comparatively short tentacular cirrus, which has 
the same form as the tentacles, but is stouter. The second segment carries two 
tentacular cirri on each side, the dorsal of which is sub-cylindrical and long, while the 
ventral is shorter, wide and distinctly foliaceous, produced into a short filamentous 
point. It is longer than the normal dorsal cirrus, to which, however, it bears a 
resemblance. 
The third segment bears a long sub-cylinclrical dorsal tentacular cirrus, longer 
than that of the preceding segment ; below it is the chaetigerous lobe and a small 
foliaceous ventral cirrus. 
These long tentacular cirri are not, in reality, circular in section, but more or 
less compressed. The longest of them reaches to the 15th segment; it is 2-25 mm. 
in length. It may be noticed that these anterior segments are shorter than those that 
follow, the increase in length being gradual. 
The parapods (fig. 50) are short, with the anterior lip longer than the posterior. 
The foliaceous dorsal cirrus is broad, as wide as its length, with an asymmetrically 
situated apex ; the cirrophore is close to the body wall. The ventral cirrus is oval, 
not pointed, about as long as the chaetigerous lobe. 
The chaetae (fig. 51). The shaft is a great deal wider than the appendix, and of 
a much higher degree of refringency, so that at the junction between the two there is a 
very marked transition when viewed under the microscope. The articular cup is 
strongly “ heterogomph ” and, as usual in the family, is very narrow ; one lip is very 
short, the other is produced into a long curved claw-like structure, both are smooth, 
and present no striations. The appendix is relatively short; its proximal end is 
narrow, but soon acquires its full breadth, and then rather rapidly dwindles, to be 
prolonged into a very fine distal portion. It is very thin even in the lower portion, 
and is obliquely striated along its whole length ; and its concave edge is faintly but 
distinctly denticulate. 
The pharynx was exposed by dissection ; the buccal region extends through 
25 segments, and the pharynx occupies nine more, i.e., its hinder end reaches to the 42nd. 
At its entrance are 16 small conical papillae. The buccal cavity is lined uniformly 
with closely set, round-topped, nearly cylindrical papillae, slightly narrower at the base 
than at the apex, and about 3 times as high as broad (fig. 52). They are practically 
of uniform size and shape throughout. In the everted condition the pharynx, there¬ 
fore, would be said to be covered with these papillae. 
