DRElSSENADiE. 



301 



Mytilus Volga?. Chemn. xi. 205. f. 2028. 



■ polymorphic. Pallas, Voy. Buss. App. 



211.; Saw. Gen. Shell, f. 4. 

 Mytilus Chemnitzii. Ferussac. 



lineatus. Waardenburg, Mol. Belgi. 



area. Kickx, Monag. 



• ? Volgensis. Gray, Ann. Phil. 1825. 



Hagenii. Baer, Per. Bull. Sci. Nat. 



1826, 140. 

 Mytilus Toreyi. Stenz. 

 Tichogonia Chemnitzii. Bossm. Icon. i. 1113. 



t. 3. f. 69. 

 Dreissena polymorpha. Van Beneden, Ann. Sci. 



Nat. 1835, 2L0. t. 8. f. 1—11.; Strickland, Mag. 



Nat. Hist. 1838, 361. 

 Inhab. lakes and rivers, attached to stones, timber, 

 and other shells. 



Mr. James de Carle Sowerby first brought the 

 fact of this animal having been introduced before the 

 public on Nov. 2nd, 1824, when he presented some 

 specimens to the Linnean Society, stating them to 



