UNIONISE. 



291 



Var, 5. rostrata. Shell moderate, oblong, rather 

 rhombic, rather compressed, brownish, much pro- 

 duced behind, very short and rounded in front. 



Anodonta rostrata. Kokeil, MSS.; JRossm. Icon. 

 t. 20. f. 284. 



Inhab. ponds, Liverpool. (Brit Mas.) 



Var. 6. complanata. Shell moderate, obovate, ob- 

 liquely truncat- 

 ed behind, com- 

 pressed, striated, 

 brownish green 

 and yellow zoned 

 Anodonta com- 

 planata. Ziegl. 

 MSS. ; Rossm. 

 Icon. i. 112. t. 3. f. 68. ; iv. 24. t. 20. f. 283. 

 Anodonta compressa. Menke, Syn. 106. 



1 rhombea. Schliit. 



intermedia. Lam. Hist vi. 86. ; Pfeiffer, 



i. 113. t. 6. f. 3., ii. t. 5. f. 1. 6.; Kengon, Mag. 

 N. Hist 1. f. 188. 



Var. 7. avonensis. Shell moderate, ovate, rather 

 rhombic, ventricose, thick, solid, rough, internally 

 white, hinder slope subangular, behind rather 

 truncated, covered with a calcareous or tufaceous 

 deposit. 



Anodonta ponderosa. Pfeiffer, ii. 31. t. 4. f. 1 — 6. ; 



Rossm. Icon. iv. t. 20. f. 282. 

 Mytilus cygneus /9. Linn. Trans, viii. t. 3. a. f. 3. 

 Mytilus incrassatus. Shepp. Linn, Trans, xiii. t. 



5. f. 4. 



o 2 



