34 
posterior tip of the body, and lateral bands pass from the medial one 
to each of the branchial tufts. Branchiz light purplish-brown, and 
tipped with light green. Tentacular sheath same colour as bran- 
chi. Tentacles light green. 
Under stones in the upper region of the laminarian zone. 
45. MELIBE PILOSA. 
Elongate, smooth, widest anteriorly, and tapering to a point 
behind. Sides convexly rounded, and the back arched. Foot 
linear, grooved, extending the whole length of the body, and acute 
at both ends. Six pairs of thick tuberculated lobes along the back, 
the anterior pair opposite, the others alternate to one another, the 
last at the tip of the body. These lobes are easily deciduous, con- 
tracted at their bases, truncated above, convex outside, and flattened 
on the inner surface. Frontal veil very large, semiglobular, much 
inflated above ; united beneath the head, forming a continuous mar- 
gin, which is closely fringed. Mouth proboscidiform, and the orifice 
vertical. Tentacles on the posterior portion of the veil rather remote, 
small, ovate, closely and transversely lamellated and retractile into 
long trumpet-shaped sheaths, which are furnished with laciniated ap- 
pendages. Everywhere with small, soft, branched, tentacular pro- 
cesses. Colour fawn, subtranslucent, more or less clouded with 
whitish, which, under the lens, has the appearance of minute dots. 
Body punctured with brown, which are most conspicuous along the 
flanks. Tubercles on the lobes brown. Foot pale. 
Length 23 inches. 
These animals were found among sea-weed, in the upper region 
of the laminarian zone, and when placed in a basin of water were 
yery active, swimming by suddenly curving the head and tail late- 
rally, so as nearly to touch one another. When slightly disturbed 
they would cast off one or all of their lobes. The length of their 
lobes varies much, being in some as large-again as in others; they 
may be consequently reproduced, after being cast off. Their foot 
cannot be used for creeping on a flat surface, but is well adapted for 
clasping sea-weed. 
46. AEOLIS SEMIDECORA. 
Body smooth, hyaline, elongate, narrow, widest in front, from 
whence it tapers to a point behind; convex above. Six pair of 
branchial filaments, arranged along the sides, hyaline, elongated, 
compressed, tapering to a point, imbricated, and the anterior pair 
remote from the others ; the last pair does not reach the tip of the 
body by one-third of its total length. Dorsal tentacles rather stout, 
cylindrically tapering to a blunt point, transversely rugose, approxi- 
mating at their bases, with small black eyes, immersed at their 
posterior bases. Head convex above, and furnished with elongate, 
subulate, cylindrical, smooth tentacles, which are much longer than 
the upper pair. Foot slightly crenated along the posterior margin, 
notched in front, and furnished on both sides with recurved tenta- 
cular processes. Colour: freckled with opaque white along the 
