376 W. C. M‘SINTOSH ON BRITISH ANNELIDA. 
greater part of the surface of the scale is densely covered with minute and rather blunt 
horny spines, which toward the free edge become large acute processes. The extreme 
roughness of the surface of the scale readily causes mud and débris to lodge. In shape 
the scales are for the most part reniform. They therefore present a marked difference 
from those of the Zetlandic specimen (which show small papille over the surface, 
a few large pale examples only projecting beyond the free edge, and eight or nine sub- 
globular processes at intervals in the same region), as well as from the form described 
by Malmgren. 
The dorsal branch of the foot bears a somewhat dense mass of rather short pale 
bristles with a slight curvature. The tips are comparatively short, and by no means 
acute. One of the longer forms is sketched in Pl. LX VII. fig. 12. The ventral division 
has translucent bristles with moderately long shafts. The tips of the superior series 
(Pl. LXVII. fig. 13) are long and somewhat taper, with rather distant rows of long 
and distinct spines, the end being minutely bifid. The tips gradually become shorter 
and stouter inferiorly (fig. 14), the strongly curved terminal division, and the inferior 
process, with its characteristic angle of incidence, being noteworthy. Some of the 
latter bristles show traces of a curve outward between the secondary process and the 
first row of spines. ‘Toward the ventral border the secondary process diminishes with 
the general size of the bristle; there is a minute trace, however, in almost all. It is 
difficult to separate these bristles from those of the larger example (with smoother 
scales) from Shetland. 
MALMGRENIA CASTANEA', n. sp. Dredged by Dr. Gwyn Jefferys off North Unst, Shet- 
land, in 90-96 fathoms, in 1867, and again, in 1868, on Spatangus purpureus (near the 
mouth), in 85 fathoms, on shell-sand. ‘The same gentleman procured it in 80 fathoms, 
off Valentia (S.W. Ireland), and 110 fathoms off the Blasquet. It has also been found 
in the Channel Islands. 
Two species only are mentioned by Malmgren as having smooth palpi, antenne, 
tentacles, and cirri, viz. WMelenis loveni and Enipo kinbergi. The first is easily distin- 
guished from the present form by the fact that the scales leave the centre of the dorsum 
uncovered anteriorly, while in the second the scales occur only on the anterior part of 
the body. Both diverge much in the structure of the bristles. In this form the head 
is slightly pinkish in life, as is also the proboscidian region, Two eyes are situated 
near the posterior border, and two laterally on the anterior prominence. ‘The tentacle 
is moderately developed, and has a slight enlargement below the tapering tip. The 
antenne have brownish pigment a little above the base. The scales are fifteen pairs, 
smooth to the naked eye, but under the microscope showing some minute papille in 
the line of the pigment, and a more distinct group opposite the curve or covered 
! The generic name is in honour of Dr. Malmgren, of Helsingfors, the author of the valuable ‘ Annulata 
Polycheeta Spetsbergie,’ &c. 
on. 
