M I S (SLATJOamUS.
Figs. 1 ta 4.
EOLIS GLAUCOIDES, Aldbr and H ancock.
E. alba, depressa, capite parvo; tentaculis parvis, simplieibus; branebiis linearibus, albis,
apicibus fulvis, glandule centrali subfulvil, in fascicubs pedunculatis 11 utrinque digestis; pede lato,
angulis anterioribus acutis.
Hnb. Under stones at low watermark, Herm Island, near Guernsey, J.A.
Body about half an inch long, depressed, rather broad, transparent white, with opaque
white spots. Head small and narrow. Dorsal tentacles short, linear, simple, white with
opaque tips. Oral tentacles very short, and broadish at the base. Branchial nearly linear,
tapering towards the top, transparent white, covered with minute opaque white spots; the
central gland is narrow, linear, and of a pale fawn colour; the apices yellowish, deepening
into fawn colour towards the tips. They are set in eleven clusters, of three or four papilla;
each, down the sides of the back, each cluster arising from a short foot-stalk; they commence
near the tentacles, and reach nearly to the tail, the posterior papillse extending a little
beyond it. A few of the papilla: nearest the back have a slight angle towards the base.
Foot broad, and rather thin at the edges, arched in front, and extending into acute angles at
the sides; terminating behind in an obtuse rounded tail. It is transparent white, with a
darkish line down the centre from the gastro-hepatic, vessel appearing through. A less
distinct, interrupted darkish line is visible down the centre of the back.
This very curious Bolts shows, in most of its characters, an approach to the genus
Glaucm, particularly in the small size of the head and tentacles, and in the branchial papillse
being arranged in clusters, arising from a short foot-stalk. Its anatomical characters bear
out this resemblance. A remarkably large and wide gastro-hepatic vessel pccupies the
centre of the body, giving off branches on each side to the branchial pedicles. The ovary,
which, from the transparency of the skin, is visible outside, is divided into two lateral portions,
which pass down the. body, and are united posteriorly above the gastro-hepatic vessel. The
jaws are small and truncated behind; and the tongue is very minute, long, and slender,
composed of a single series of plates, each bearing a single spine.
When the genus Bolts, as we at present retain it, comes to be broken up, this species
will probably constitute a new generic type.
Figs. 1,2, 3. Eolis Glaucoides, different views.
4. Branchial papillse more highly magnified.