Class VI. SHELLS. 113 



Lin.Sjfi. 115S. No. 256* Lift. Conch, tab. 356. fig. 195- Modiolus. 



y-j. Great, 



M. with a flrong fhell, with a blunted upper 

 end *, one fide angulated near the middle -, from 

 thence dilating towards the end, which is rounded. 



The greater! of Britijh muffels. Length from 

 fix to feven inches. 



Lies at great depths* Often feizes the bait of 

 the ground lines, and is taken up with the hooks* 



"Tab. lxvi. fig, 77. 



Lin. Sjift. 1 158. No* 25 7. Lift. Angl. App* tab. i. fig. 3. Cygneus* 



78* Swan* 



M. with a thin brittle fhell, very broad and con- 

 vex, marked with concentric ftrias. Attenuated 

 towards one end ; dilated towards the other. De- 

 corticated about the hinge. 



Color, dull green. 



Length fix inches ; breadth three and a half. 



Inhabits frefh waters. Pearls are found in this 

 and the following fpecies* 



Tab. lxvii. fig. j8. 



Lin. Syft. No. 258. Faun. Suec» No. 2158. Lift. Angh tab. i. Anatinus. 

 fig- 2. 79, Duck. 



M. with a fhell lefs convex, and more oblong than 

 the lad. Very brittle, and femi-tranfparent. Space 

 round the hinges like the lafl. 



Vol. IV, I Length 



