^4)8 CONTRIBUTIONS TO THE BRITISH FAUNA. 



6. Lucernaria fascicularis, 

 Plate xviii. fig. 1, 



Substance gelatinous ; colour dark-brown, near- 

 ly opake. Tail cylindrical, flexuous, wrinkled, 

 extensile, and somewhat narrower at the basCj, 

 where it adheres to broad-leaved Fucu Body 

 bell-shaped, sub-quadrangular, concave within. 

 Margin divided into four arms, which are broad 

 at the base, divided at the top, and concave with- 

 in. On the top of each of the divisions of the 

 arms, there is a fasciculus of tentacula, upwards of 

 a hundred in number. The mouth is placed in 

 the centre, and consists of a loose tubular mem- 

 brane, sometimes four-notphed at the tip, but of- 

 ten, at the pleasure of the animal, e:jipanded, cir- 

 cular, or striated. 



Internally, the animal appears to be divided in-- 

 to four compartments, reaching from the centre 

 to the margin between the arms. The divisions 

 are formed by a thin membrane from the four 

 forners of the mouth. On each side of these di- 

 yisions, a thick corrugated band extends from the 

 rent re, almost to the border of the margin. The 

 bands are the intestines of the animal. The in- 

 side of the mquth contain^ nurnerous white fila- 

 nients. 



The animxal contracts itself into various shapes. 

 It moves the tentacula very quickly, especially 

 if muddy water is poured upon it. ^Ithougti 



