28 TERETULARIA. 



Lineus annulatus, Montagu in Mus. Leach, 



Carinella trilineata, Johnston in Loud. Mag. Nat. Hist, vi, 232. f. 24. 



W. Thompson in Ann. Sf Mag. Nat. Hist. vii. 482. 

 Meckelia trilineata, Johnston in Ann. ^- Mag. Nat. Hist. xvi. 435. 

 Valencinia annulata. Dies. Syst. Helm. i. 244. 

 Gordius anguis, Dalyell, Pow. Creat. ii. 85.pl. 13, & pi. 10. f. 7-10. 



Hub. The coralline region. Lurks in the tubes of other worms, but 

 can form for itself a sheath of dried gluten of considerable 

 tenacity. 



(a) Firth of Forth, Mr. Jenner. 



(b) South Devon, G. Montagu. 

 Ic) Berwick Bay, Dr. Johnston, 

 (d) Berwick Bay, Dr. Johnston. 



2. M. taenia, dull reddish-brown or pale red, with a white longitu- 

 dinal dorsal fascia divided by a dark mesial line ; ventral surface 

 paler; head obtuse and white in front. Length 16" ; breadth 1'". 



Gordius taenia = The Riband Gordius, Dalyell, Pow. Creat. ii. 70. 

 pi. 10. f. 1, 2. 



Hab. Coast of Scotland ; " not rare, but seldom seen above four 

 inches long," Dalyell. Lurks in the tubes of other worms. 



Obs. " The eolour of the back consists of five lines, the two ex- 

 terior stripes being the broadest, having a white line within each, 

 and the central dark line between them." — Dalyell. 



20. SERPENTARIA. 



Serpentaria, H. D. S. Goodsir in Ann. 4" Mag. Nat. Hist. xv. 377. 



Char. Body linear-elongated, flat, smooth and even, acephalous 

 and eyeless, breaking up readily in pieces; anterior end with or 

 without fissures : mouth obscure and terminal, with a long protrusile 

 proboscis : a subnuchal aperture. 



1 . S. fragilis, of a uniform grey colour, with a lighter-coloured thin 

 margin ; head with a small point ; subnuchal aperture elliptical. 

 Length 15"; breadth 10'"; thickness 1"'. 



Serpentaria fragilis, Goodsir in Ann. Nat. Hist. xv. 377. pi. 20. f. 1, 2. 



Meckelia serpentaria. Dies. Syst. Helm. i. 2(56. 



Gordius fragilis, Dalyell, Pow. Creat. ii. 55. pi. 6. f. 6, 7 & 7*. 



Hab. The coralline region. 



(a) Firth of Forth, Lieut. Thomas, B.N. 



2. S. fusca, of an umber-brown colour, the ventral surface almost 

 white ; anterior end obtuse, with a puckered mouth ; subnuchal 

 aperture round. Length 5-18"; breadth 4"' ; thickness Ii"'. 



