THE NEMERTINES OF MILLPORT AND ITS VICINITY. 25 
noted that, contrary to BurcErR, the Millport specimens showed a distinct marking 
off of the head from the body. 
The eyes appear to be another variable character. MacInrosu describes them as 
constituting a long wedge on each side, with the apex forwards. JousIN (8) speaks of 
“des amas de petits yeux noirs.” I have, however, always found them arranged in 
a single line ; they are numerous, situated anteriorly on each side, along the junction 
of the pale margin of the head with the general brown of the dorsal surface; they 
extend from near the tip to a point about half-way between this and the situation 
of the ganglia. 
The lateral grooves extend from nearly the anterior end of the head backwards 
to the level of the ganglia. They can be narrowed or closed, but the pit at their 
posterior end always remains open. 
Inneus ruber (Mill.) (= gesserensis auct.). 
This is the commonest Nemertine of the shore at Millport; it is found abundantly 
under stones at all tide-levels. [ examined specimens from the shore near the Biological 
Station, from Balloch (13 miles to the N.), from the islands in Millport harbour, and 
from Fairlie sands. 
Specimens live well in captivity in spite of lack of care in changing the water or 
in compensating evaporation ; they sometimes show a tendency to leave the dish 
and very often lie along the water-line at the side. A number of individuals commonly 
coil themselves up together. 
Specimens were met with of all /engths from 1 to 9 inches; a common length is 
2 to 3 inches. The breadth does not vary so much as the length, being from 
1 to 2 mm. ; ordinary specimens thus appear moderately stout. 
The colour is remarkably variable. Jouprn (8) has distinguished five colour 
varieties, as follows —(a) black and dark blue, () dark olive green, (vy) light olive 
green ; these three correspond to Lineus gesserensis as described by Maclnrossx ; 
(5) green and red, (e) red; these two correspond to Lineus sanguimeus in MacInrosn’s 
description. Maclnrosu, for L. gesserensis, gives the two colours reddish brown and dull 
olive. Bureer did not meet with this species at Naples. 
The specimens met with at Millport fall into three classes, as follows :— 
(i.) The commonest is a purple variety. ‘This may be a pure deep purple through- 
out, though more usually the animal shows, when extended, a brownish tinge; the 
colour may be mottled with a number of small patches of a lighter tint; and the 
ventral surface may be somewhat or even much lighter than the dorsal. 
(ii.) The next most common is a brown variety. The depth of tint varies, and a 
purplish tinge may be present, especially in the darker forms, due presumably to the 
cilia on the surface of the body. The head may be darker than the rest of the body. 
In a light-brown specimen the ventral surface was quite pale, and the lateral margins of 
the body were also marked by a narrow lighter stripe. 
TRANS. ROY. SOC. EDIN., VOL. XLVIII. PART I. (NO. 1). 4 
