ANNELIDA. 



ORDER L— APODA. 



TEIBE NEMERTINA. 



Genus GoKDius. 

 G. aquattcus, Linn. 



North of Ii-eland, W. T. East, West, and South, R. Ball. 



Genus BoRLASiA. 

 B. alha, 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, Avere 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 alha : — 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 l-12th 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, diff"ering little from the last in any external character but 

 that of colour, Avas 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 Aveeks in a phial of sea-water, and 

 thus afforded ample opportunity for observation. The Avater Avas not 

 changed during that period, but the length of time that they Avould have 

 lived under such circumstances was not ascertained, in consequence of 

 my leaving home. The individuals of this species Avere about 3 inches in 

 length and perfectly agreed Avith the description and figures ; some had 

 only six, and others eight eyes as stated by Dr. Johnston. 



B. oltvacea, Johnst. 



A worm agi-eeing in all characters of form and colour Avith this — having 

 four eyes, and marked with red over the site of the heart ; characters 



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