A CONTRIBUTION TO THE ANNELIDA. 63 
presence of an extensive dorsal blind-gut is another important 
divergence. Both, however, feed for the most part on the 
same substances. 
Nervous System.—The central mass of the nervous 
system lies immediately under the caruncle, and consists dor- 
sally chiefly of nerve-cells, ventrally of fibres (Pl. 6, figs. 38 and 
Sye92)s : 
The position of the eyes (PI. 6, fig. 3, ocd. and ocv.) in 
Kuphrosyne diverges from that in Spinther, for in the 
latter the four eyes are confined to the dorsum, whereas in 
the former two are dorsal and two anterior and ventral. 
The subcesophageal ganglia form a single mass behind the 
mouth, with a fibrous central region and two lateral cellular 
masses as in EH. cirrata. 
The ventral nerve-cords (which Ehlers states are non- 
gangliated) lie on each side of the median line enveloped in 
their sheath, and partly separated superiorly by a fascicle of 
longitudinal muscular fibres (PI. 7, fig. 4, ne.). The oblique 
muscles pass down by their external borders to decussate in- 
feriorly. With the exception of the capsule of connective 
tissue, the cords in section present a granular surface from the 
cut extremities of the fibres. Beneath the fascicle of longi- 
tudinal fibres is a curved strand of transverse fibres (Pl. 7, 
fig. 4, em.), which forms a commissure between the cords. It 
is concave from above downwards. In many sections a strand 
of fibres closes in the space for the longitudinal muscular 
fibres superiorly. External to the cords are flattened bands 
of muscular fibres, the decussating fibres of the oblique mus- 
cles, and the circular coat with the cutaneous tissues (Pl. 7, 
fig. 4). 
In comparing these cords with those of Euphrosyne 
capensis, the same fascicle of longitudinal muscular fibres and 
the firm investment superiorly are characteristic. In Euphro- 
syne borealis the muscular parts are specially massive. In 
E. cirrata, again, the nerve-cords, which lie close to the 
hypoderm, are flattened in section and much more widely se- 
parated. A transverse commissure, however, is present. 
