HUCHONE. 281 
la-Hougue, bear pairs of smaller appendages than in D. bombyx, Dalyell, but distinguished 
by their form, which is flattened-spatulate, and also that they do not cover the eyes as in 
D. bombyx. There are nine setigerous segments anteriorly ; the lateral eyes are situated 
between two pinnules, and thus differ from D. bombyzx, but there is variation in the shape 
of the branchial appendages in the ordinary form, and also in their relation to the eyes. 
In all probability Kroyer’s form is only a variety. 
The tube resembles that of Sabella 
penicillus. 
Genus CLXXI.—Eucuonn, Malmgren, 1865. 
Collar fairly developed, with a deep dorsal fissure and a small ventral notch. Branchize 
forming two half circles; united nearly to the tip by a membrane, and with a broad web 
on each side of the free process. 
Tentacular cirri two to ten, smooth, filiform and unequal in 
> 
= 
= 
= 
= 
Fic. 157.—Transverse section of Euchone analis, Kroyer, about + of an inch from the front and in the 
line of the feet. 
ov., ovary. x 30 
length. Body sublinear, slightly flattened, a little attenuated posteriorly, and having the 
anterior region of eight to twelve segments. Dorsal groove anteriorly, and a well-marked 
ventral groove behind. Segments biannulate. 
Posteriorly it presents a scoop-shaped anal 
region slanting from above downward and backward. Setigerous processes commence on 
the second segment and continue to the posterior end. Anterior bristles of two kinds— 
dorsal with elongate winged tips, ventral with spatulate tips. 
Rows of hooks commence 
on the second bristled segment, and continue to the end. Hooks as in Chone anteriorly 
and. posteriorly. 
In Huchone analis transverse section in front shows the hypoderm greatly developed 
on the ventral surface (Fig. 157), thinning off in the lateral regions, and with a slight groove 
‘mid-dorsally. The dorsal longitudinal muscles form-:an almost complete loop in section, 
the broader end of each being external, and the mesenterial attachment of the alimentary 
canal separates them in the middle line. 
The folds of the ventral longitudinal muscles are 
also almost continuous. A little behind the foregoing the ventral surface is marked by a 
deep groove. The alimentary canal is much enlarged and its lumen occupied by folds of 
mucous membrane. 
Toward the posterior end the muscles at first indicate no change, though 
