511 



confefs, is fo very fimilar to the animal of this, that a 

 reference will fave the trouble of a repetition : the cir- 

 cumftance of that (hell being always coiled in a circular 

 form, and generally in a reverfed manner, added to its 

 folitary habit, are ftrong prefumptive evidence of dif- 

 tinttion. 



13. 

 Serpula triquetra. Lin. Syjl. p. 1264. Tri^uetra. 



, GmeJ. Syji. p. 3740. 



Martini Conch, i. t. 3. f. 25. 



Turt. Lin. iv. p. 603. 



Bajler Opiifc. i. t. 9. f. 2. A. B. 



Br. Zcol. No. 156. 

 Serpula vermicularis. Ellis Corall. t. 38. f. 2. 



Don. Br. Shell, in. t. 95. 

 Serpula angulata. Da Cojia. p. 20. t, 2, f. 9. 



Serpula contortuplicata. Lin. Sjji. p. 1266. 



Guiel. Syjl. p. 3741. 



Turt. Lin. iv. p. 604. 



Br, Zool. No. 158. t. 91. f. 157. 

 (figure niifplaced.) 



S. with a (Irong, opaque fhell, irregularly twiftedand 

 contorted; fometimes nearly llrait, or only a little flex- 

 uous, roughened with tranfverfe wrinkles, and ufually 

 more or lefs carinated: in fome the dorfal ridge is much 

 elevated, and the bafe fpreads fo much as to give it a 

 triangular appearance; and, not unfrequently, there are 

 two other fmaller ridges along the fides, one on each fide 

 the dorlal cai'ina. 



In 



