REPORT ON THE ANNELIDA. 
119 
marked spinous rows, those toward the body being shorter and more curved (PL Xa. 
fig. 5, an intermediate example). 
The ventral group consists of bifid bristles with somewhat short tips (PI. Xa. fig. 6, 
an average example), the usual gradational series occurring from above downward 
(he., the longest and most slender tips being superior). They are faintly straw-coloured 
and translucent, and have a finely attenuate secondary process which passes nearly straight 
outward. The rows of spines are only well-marked superiorly and inferiorly. 
A large number of ova occurred posteriorly on the dorsal aspect of the feet, under the 
scales. 
The male (PI. XIV. fig. 1) differs considerably in outline, being longer, and cylindrical 
rather than ovoid ; the body is larger, and the scales leave the middle of the dorsum 
uncovered from head to tail. The arrangement of the eyes, however, is very similar, the 
pale lenticular region of the large anterior eyes in both being toward the front, as if 
vision were most useful in that direction. The scales seem to number about fifteen or 
sixteen on each side, and are much more opaque than in the female. Their structure, 
however, is similar, and especially the peculiar granular vermiform bodies. The scar for 
their attachment is large. The pedicle for the first scale is very prominent in both sexes. 
In the male the enlargement which is present in several dorsal cirri of the anterior third 
(PL XIV. fig. 1) is mainly a ventral development, for min g a kind of dependent lobe 
containing a granular substance below the cirrus proper. These enlarged cirri seem to 
be arranged alternately with the ordinary tapering forms (like the tentacular cirri), and 
they are shorter. The ventral cirrus is on the whole shorter and thicker at the base 
than in the female. The ventral papilla is similar. The dorsal bristles appear to be 
somewhat shorter than in the female, and this is an interesting feature in regard to the 
ovigerous character of the dorsum of the foot.. In intimate structure both dorsal and 
ventral bristles agree with those of the other sex. 
In the intestine of the male were the translucent chitinous plates and long hairs of 
a minute Crustacean and a few fragments of Algae. The teeth are pale brownish, and the 
appearance of the proboscis and its papillae corresponds with that generally observed. 
This form approaches Harmothoe, though the dilatation of the dorsal cirri is 
characteristic. 
In minute anatomy the sexes differ slightly. The oblique muscles in both proceed to the 
upper and external part of the nerve-area, which is very limited. The cords in the male 
are flattened, and protected externally by a very thin layer of hypoderm, and a thick 
layer of cuticle, which, however, diminishes over the median ventral area. The male 
elements fiU the perivisceral cavity and its ramifications. 
In the female the nerve-area seems to be more limited, and the cords less flattene I. 
The oblique muscles also appear to approach each other somewhat more closely above 
this region. 
