COfiCnYUA—DITHYRA. xxix. 



9. vespertina, antich subangulata, dente altera laminari ohliquo. 

 somewhat angular at the anterior end, with one 

 of the teeth laminar and oblique. 



10. deflorata, antich subangulata, striis decussatis. 



somewhat angular, with decussate striae. 



11. Ferroensis, atitich Jlexurd angulari, ared anguli reticulata. 



with an angular flexure at the anterior side, and 

 the area of the angle reticulate. 



12. solidula, subtrigona, dentibus minutis obtusis. 



somewhat triangular, with the teeth small and 

 obtuse. 



13. polygona, suborbicularis, margine subundato. 



somewhat orbicular, with the margin a little 

 irregular. 



14. strigilata, anticl bifariam striata, dente altera laminari obliquo. 



striate in two directions at the anterior side, with 

 one of the teeth laminar and oblique. 



15. Scopula, antich bifariam striata, dentibus erectis. 



striate in two directions an the anterior side, with 

 all the teeth erect. 



27. Tellina. 



* valvd alterd bidentatd. 

 one valve with two teeth. 



J, lineata, valvd unidentatd absque laterlalihus. 



the siDgle toothed valve without lateral teeth. 



