TEREBELLA. 239 



Desc. " First seventeen or eighteen joints furnished with short 

 peduncles and fascicuU ; other joints with long peduncles and no 

 visible bristles. Capillary appendages whitish, very slender, nume- 

 rous, and nearly double the length of the body. We have observed 

 this animal fixing its tentacula, and by contracting them drawing its 

 body forwards." — Montagu. 



8. T. tuberculata, branchise arbuscular ; body reddish-brown, 

 speckled with white tubercles. Tube of fine sand. Length 5". 



Terebella tuberculata, Daly ell, Pow. Great, ii. 197. pb 29. f. 1,2, and 

 pi. 26. f. 8. 



Hab. The coralline region, rare. Shetland, Daly ell. 



Desc. " The body extends about 5 inches ; and it is provided wdth 

 about seventy long and strong tentacula, stretching 9 inches, which 

 are capable of sweeping an area 1 8 inches in diameter around the head, 

 while the body remains stationary. Six branchise are disposed in 

 three pairs, the highest pair the longest, the other two successively 

 decreasing. These are fine and florid organs, of peculiar formation, 

 appearing somewhat mottled like birch bark under the microscope. 

 These parts are alike numerous as those of the others, but they do 

 not abound in similar curvatures ; their extremities terminate in forks 

 like thorns. Thirteen transverse furrows indent the upper portion 

 of the body, which is subdivided into numerous annulations, and 

 tapering down towards the lower extremity. As the animal extends 

 its body, the annulations of the upper portion are quite obliterated. 

 The whole is of a fine reddish-brown colour, the surface universally 

 speckled with low white tubercles, rendering it altogether a very 

 beautiful object. 



" This Terebella constructs a wide loose case of fine sand, so large 

 that it can reverse itself within, and sometimes the tentacula are 

 seen protruding from both orifices. At first, from its general resem- 

 blance to the T.figulus, I thought it might construct a tube of mud 

 or clay ; but it testified no disposition to work in either, though 

 employing some fragments of comminuted shell along with the sand. 

 Night is the season of its greatest activity." — Dalyell. 



** Branchise in two pairs. 



9. T. textrix, body covered with a cobweb; pale, unspotted; the 

 setigerous feet coequal with the number of segments. 



Terebella textrix — the Weaver, Dalyell, Pow. Great, ii. 206. pi. 28. 

 f. 15-18. 



Hab. Shores of Scotland, rare, Dalyell. 



Obs. " Length of one specimen 6 lines, of another 9, of a third 

 12. The first had twenty-five tentacula, extending an inch, and a 

 pair of ramified red branchise on each side, with a stump behind 



