548 



S. with a thin, fragile tube, compoTed of largefrag- 

 ments of fiiells, and little or no fand, cemented fparing- 

 ly on a thin membrane, ufually attached its whole length 

 in a flexuous or Terpentine form on old bivalves. Mr. 

 Pennant, and Doctor Pulteney both mention this 

 circumflance on the Dorfeijhire coafl : it is not, how- 

 ever, confined to that part, but is common throughout 

 the weftern fliores, and elfewherc. 



Is rarely found on ftones ; and what is poffibly a varie- 

 ty is fometimes feen creeping amongfl: the branches of 

 Sertularia abietina : if this lafl; is diftinft, we dare not 

 venture to give it as fuch, never having as yet had an 

 opportunity of examining the animal. 



The animal of 5. concldlega is a Tcrebella, of a dull 

 orange colour, with numerous, pellucid tubercles, and 

 hranchics on each fide: tentacula round the mouth nu- 

 merous, flender, filiform, and extremely long; retrac- 

 tile, but ufually extended two or three inches, or more, 

 and exceeds the length of the body ; their colour is 

 orange-yellow, prettily fpotted with red ; and when the 

 animal is in vigour, they are in continual motion, thro%vn 

 about in all directions : behind the head are (liort, branch- 

 ed feelers, of a deeper orange colour. 



Do61or TuRTON has erroneoufly made this animal 

 the inhabitant o? Sabclla Uibiformis, 



Wc 



