Beaumont — Fauna and Flora of Valencia Harbour, Ireland. 829 



Britain. Joubin's figure (1894, pi. iii., fig. 59), which he sug- 

 gests may be T. nigrum, represents the common littoral variety 

 of T. dorsale. 



Several examples were dredged in Yalencia Harbour, on 

 Ascidian ground, and others were obtained among weed from 

 between tide -marks. 



Bistrihution. — Plymouth (Riches, W. I. B.) ; Falmouth Har- 

 bour; Port Erin (W. I. B.). 



Order— HETERONEMERTINI. 

 Family— LINEID^. 



Genus — Lineus. 



liineus gesserensis (0. F. Miiller). 



Linens gesserensis, M'Intosh, Burger. 



Lmeus obscurus (Desor), Hubrecht. 



Common round the shores of Yalencia Harbour, under stones 

 and amongst weeds. Colour, dark red, reddish brown, dark 

 green. Largest specimen, 17 cm. long. 



Lineus lacteus (Grube). 



Some slender creamy-white IS^emertines, probably of this 

 species, were found in the fine gravel on the shore near Reena- 

 giveen. Only one perfect specimen was obtained. It measured 

 between 3 and 4 cm. in length, and was more slender than is 

 usually the case with Z. gesserensis of that length. The anterior 

 end was pale brown, the brain region red, and the rest of the 

 animal creamy white. There were two eyes on one side, three 

 on the other. 



The mouth was situated at a distance behind the brain equal 

 to the interval separating that organ from the anterior extremity 

 of the head, which is in accordance with the statement of 

 Burger. In M'Intosh's figure of Z. lacteus (1874, pi. xix., fig. 3) 

 the mouth is shown somewhat further back than this. No 

 note was made of the position of the side organs in this speci- 

 men ; they are in front of the mouth in Z. lineus and behind it 

 in Z. gesserensis, according to Burger ; but they appear in front 

 of the mouth in M'Intosh's drawings of both species. On the 

 whole this animal approached more nearly to Z. lacteus. 



E.I. A. PEOC, SER. in., VOL. V. 3 M 



