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U. obesus, (Lea.) Trans. Am. Phil. Soc. vol. 

 4, pi. xiii. f. 26. 

 incurvus, do. do. pi. xiii. f. 27. 



anodontoides, do. do. pi. viii. f. 1 1. 



glans, 



elegans, 



ebenus, 



asper, 



fabalis, 



soleniformis, 



acutissimus, 



olivarius, 



do. do. pi. viii. f. 12. 

 do. do. pi. ix. 13. 

 do. do. pi. ix. 14. 

 do. do. pi. ix. 15. 

 do. do. pi. x. 16. 

 do. do. pi. x. 17. 

 do. do. pi. x. 18. 

 do. do. pi. xvi. 38. 



U. pyramidatus, (Lea.) Trans. Am. P. Soc. 



vol. 4, pi. xvi. f. 39. [White var. Un- 



datus of Barnes.] 

 1 trigonus, (L.) T. A. P. S. v. 4, p. xvi. f. 40. 

 ' formosus, do. do. pi. xvi. 41. 

 ' perplexus, do. do. pi. xvii. 42. 

 1 foliatus, (Hildreth.) Sil. J. vol. 14. 

 ' angustatus,(L.)T.A.P.S.v.4,p.xvii.f.43. 

 ' arcaformis, do. do. pi. xvii. f. 44. 

 ' ochraceus, (Say.) Nich. Ency. pi. ii. f. 8. 

 ' crassa, Say's Am. Cone. pi. i. f. 8. and 



Wood's Gen. Cone. pi. xx. xxi. 



Hyria. Shell equivalve, obliquely triangular, eared; the base truncated 

 and straight; hinge with two low teeth; the posterior or cardinal one divided 

 into numerous diverging parts, of which the interior are the smallest, the oth- 

 er anterior or lateral, very long and lamellar. Ligament external, linear. 



H. avicularis, H. corrugata. 



Anodonta. Shell equivalve, inequilateral, transverse; hinge linear, with- 

 out teeth: a smooth, cardinal lamina, truncated, or forming a sinus at its an- 

 terior extremity, terminates the base of the shell. Two distant, lateral sub- 

 geminal, muscular impressions. Ligament linear, external; its anterior 

 extremity inserted in the sinus of the cardinal lamina. 



A. maximus, (a new species, from Lake 



Superior,) — nondescript. 

 ' undulata, (Say.) Rugosus of Swainson, 



an old shell. 

 ' suborbiculata, (Say.) Am. Cone. pi. xi. 

 ' areolatus, (Swainson.) Illus. of Zoology. 

 ' cygnasus, (Lamarck.) Brewster's Cyclop. 



vol. 8, pi. ccv. f. J 6. 

 ' anatina, (Lamarck.) Turton's Biv. Shells, 



and Pennant's Zoology, pi. lxviii. f. 79. 

 ' sulcata, Ency. Meth. pi. ccii. f. 1. a. b. 



A. marginata of Say, Am. C. pi. iii. f. 5. 



A. cataracta, (Say.) Am. C. pi. iii. f. 4. 

 ' rubens, Ency. Meth. pi. cci. f. La. b. 



hab. Senegal. 

 ' crispata, do. pi. cciii. f. 3. a. b. do. 

 ' uniopsis, (South Seas.) 

 ' intermedia, Encyc. Meth. pi. cci. f. 2. 



hab. France. 

 ' trapezialis, (this may be the undulatus of 



Hildreth.) 

 ' glauca, (hab. Acapulco.) 

 ' sinuosa, Ency. Meth. pi. cciii. f. 2. a. b. 

 ' Patagonica, do. pi. cciii. f. 1. a. b. 



Iridina. Shell equivalve, inequilateral, transverse; the beaks small, 

 reflected, almost straight; muscular impressions similar to the genus Anodon; 

 hinge long, linear, attenuated about the middle, tuberculated throughout the 

 whole length, almost crenated; the tubercles unequal, frequent. Ligament 

 external, marginal. 



I. Nilotica, (Sowerby.) Zool. Jour. I. exotica, Ency. 204. 



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