290 CONCHIFERA. 



Mytilus anatinus. Linn. Trans, viii. t. 3. a. f. 1. 

 xiii. t. 5. f. 5. 



Anodon cygneus. Turton, Man. ed. 1. f. 8. ; 

 Drap.Moll. i. 12. f. 1.? 



Anodonta cellensis. Rossm. Icon. t. 19. f. 280. 



? Anodon paludosus. Turton, Biv. 240. t. 15. f. 6. 



Mytilus dentatus, Turton, Diet, is only an acci- 

 dental distortion of this variety. 

 Inhab. ponds in very still water. 



Var. 2. stagnalis. Very like last, but shorter, and 

 the lower edge rather more rounded. 



Mytilus stagnalis. Sow . Brit. Miscel. and Brit. Mus. 

 Inhab. ponds. 



Var. 3. cygnea. Very like the two former, 



but shorter, and the lower edge still more 



rounded. 

 Anodonta cygnea. Pfeiffer, i. 3. t. 6. f. 4.; 



Rossm. Icon. t. 3. f. 67., t. 5. f. 342. 

 Mytilus cygneus. Schroet. Flussc. t. 1. f. 1.; Penn. 



Brit. Zool iv, t. 67. f. 78. ; Linn. Trans, viii. 



t. 3. a. f. 2., xiii. t. 5. f. 3. 



Var. 4. piscinalis. Shell moderate, rather rhombic- 

 oval, ventricose, rather thick, often beautifully 

 coloured, rather produced behind, and with the 

 wing more compressed and elevated. 



Mytilus maculatus. Linn. Trans, xiii. t. 5. f. 6. 

 (Young). 



Anodonta piscinalis. Nilson, 116. n. 3. ; Schroet. 

 Flussc. t. 3. f. 1. ?; Drap. t. 12. f. 2.; Rossm. 

 Icon. t. 19. f. 281., t. 30. f. 416. (var.). 



Anodonta ventricosa. Pfeiffer, ii. 30. t. 3. f. 1. 6. 



