ANNELIDA. 
ORDER I.— APODA. 
TRIBE NEMERTINA. 
Genus Gordius. 
G. aquaticus, Linn. 
North of Ireland, W. T. East, West, and South, R. Ball. 
Genus Borlasia. 
B. alba, Thompson. 
Dec. 18, 1843. — Two worms, apparently of the genus Borlasia (John- 
ston, Mag. Zool. and Bot., vol. i. p. 536) and of the same species, were found 
on the beach a short way northward of Carrickfergus by Mr. Hyndman 
and myself. They were lurking under stones between tide-marks. The 
species may be described as new, under the name of Borlasia alba : — of a 
whitish colour throughout, excepting behind the eyes on each side, where 
a reddish spot appears : eyes fourteen ; the first four on each side near 
the margin of the body disposed in a line, and at equal distances from 
each other ; considerably behind them are three at each side disposed in 
a triangular manner, the base towards the head of the worm : 
entire length 2 inches when stretched out so that its breadth is 
1 line or 1-1 2th of an inch. 
The annexed outline shows the position of the eyes. 
1. Reddish spots. 
B. octoculata, Johnst. 
A few specimens agreeing in size and all the characters with the de- 
scription and figures were obtained with the last. Cultra, 1848, W. T. 
B. purpurea, Johnst. 
This species, differing little from the last in any external character but 
that of colour, was procured at the same time, but was much more numer- 
ous. Several specimens of this and the other species of the same family 
here noticed were kept alive for three weeks in a phial of sea-water, and 
thus afforded ample opportunity for observation. The water was not 
changed during that period, but the length of time that they would have 
lived under such circumstances was not ascertained, in consequence of 
my leaving home. The individuals of this species were about 3 inches in 
length and perfectly agreed with the description and figures ; some had 
only six, and others eight eyes as stated by Dr. Johnston. 
B. olwacea, Johnst. 
A worm agreeing in all characters of form and colour with this — having 
four eyes, and marked with red over the site of the heart ; characters 
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