Class VI. MYTILUS. MUSSEL. 239 



thence dilating towards the end, which is round- 

 ed. The greatest of B?itish mussels. Length 

 from six to seven inches. 



Lies at great depths. Often seizes the bait 

 of the ground lines, and is taken up with the 

 hooks. Tab. Ixix. Young. M. curtus. Tab. 

 Ixvii. Jig. 2. ";; : ■■-:'■■''. ■.'•;.', ./■ ' , . . 



Lin. Syst. 1158. No. 257- Li7i. Tr. \\n. \0q. t. Z. A. f. 9. cygneus. 



Gm. Lin. 3355, 2. /3. t. 3. A./. 3. "'^«"- 



List. Angl App. tab. i.fg. 3. Mont. Test. Br. 179. 



M. with a thin brittle shell, ver}'" broad and 

 convex, marked with concentric stria;. Atte- 

 nuated towards one end ; dilated towards the 

 other. Decorticated about the hinge. Color, 

 dull green. Length six inches ; breadth three 

 and an half. 



Inhabits fresh waters. Pearls are found in 

 this and the following species. Tab. Ixx. 



duck. 



Lin. Syst. No. 2bS. Gm. Lin. List. Angl. tab. i. Jig. 2. 10. a^jati- 



3355. Lin. Tr. \in. 110. Nus. 



Faun. Suec. No. 2158. 3Iont. Test. Br. 171. 



M. with a shell less convex and more oblong 

 than the last. Very brittle, and semi-transpa- 

 rent. Space round the hinges like the last. 

 Length about five inches ; breadtji two and a 

 quarter. 



