PART II. ATBACHIA.-^-ANODONTlN^E. 381 



SUB-FAM. 4. ANODONTIN^:. 



Cardinal teeth none ; lateral tooth extending along the 

 hinge or entirely wanting; hinge margin generally 

 winged. 



Lamproscapha Sw. Shell not winged, elongate pod- 

 shaped ; teeth none ; bosses near the anterior ex- 

 tremity. Tropical America only? 

 L.? elongata Sw. Zool. 111. i. 176. siliquosa. Braz. Test, 

 ensiforme Spix. Braz. Test. pygmea. Ib. 



Symphynota* Lea. A single or double lamellar tooth 

 extending the whole length of the hinge margin ; 

 valves generally winged and connate, (fig. 123. t.) 

 plicata Leach. Zool. Miss.f ? tenuissima. Am. Tr. iii. 

 lavissima Lea. Am.Tr. iii. pi. 11. f. 21. J 



pi. 13. f. 23. rubens. En. Meth. 201. f. 1. 



bialataZea. Ib. pi. 14.f. 24. 



Anodon Lam. Doubly winged; no lamellar or other 

 teeth. 



A. cataracta Lam. vi. 1. cygnea Lam. Gualt. pi. 7. 



p. 85. f. F. 



Hemiodon Sw. Shell ovate ; tubercles or undulations 

 on the hinge margin, representing cardinal teeth. 

 H. undulatus. (An. rugosus purpurascens Zool. 111. i. 160. 

 Zool. 111. i. 96.) areolata. Id. ii. 18. 



Patularia Sw. Shell nearly equilateral,, round or cor- 

 date ; no teeth. 

 T. ovata Sw. Ex. Conch, pi. 36. rotundatus, Ib. pi. 137. 



SUB-FAM. 5. ALASMODONTINJE. 



Lateral teeth entirely wanting ; cardinal teeth one or 

 two. 



* Dipsus Leach. 



f Differs from bialata by having oblique depressions towards the bosses 

 or beaks, which latter also are not marked with " concentric undulations." 



t Seems to form the passage to Anodon. Specimens labelled by Mr, Lea, 

 were totally different from my Hem. vurnurascens. 



