520 



The femi-lunar perforated Wormfhell: the colour 

 wliite, opaque and gloffy. From Sandwich, very rare. 



The fhell, which Mr. Boys favoured us with for that 

 given by Walker, was not perforated, and differed fo 

 little from the preceding, that we are inclined to believe, 

 it is no other than a mutilated fpecimen of that (hell. 



We have found it in Cornwall, and fometimcs with the 

 fmall interior compartment worn off", which gives it the 

 appearance of being naturally perforated. 



Intortum. Serpula fubovalis intorta umbilico pervio. IVaJk. Min. 



Shells, f. ] . 

 Serpula Seminulum. Lin Syji. p. 1264 ? 



Gmel Syft. p. 3739? 

 Turt. Lin iv. p. 602 ? 

 Martini Conch, i. t. 3. f. 22. a. b ? 

 Gualt. t. X. f. S. 

 Serpula ovalis. Lin. Trans, v. t. 1. f. 28. 29. 30. 



(Adams.) 

 Turt. Lin. iv. p. 60S. 



V. with a fub-oval, comprefied, opaque, gloffy-white 

 (hell, compofed of three, and fometimes four, compart- 

 ments; the interior ones varying in fliape and fize; 

 ibme are longer in proportion to their breadth than 

 others : thefe have ufually only three well defined com- 

 partments: but the larger and more fub-orbicular fliaped 



variet\' 



