UUAfllKll'DDA. 77 



7-1. WaI.DIIKIMIA ? UMllllA. 



Shfll orl)idiliir. depressed, slif^litly tiiinciited in front, smooth ; 

 dorsid Vid\c witli a deep lonjritiidiiiid furrow heeoniinj: wider in 

 front ; niiirfrins evenly siunuted ; ventral valve with un obtuse 

 lon<ritudinal ridge; beak very small, reeurved. Lon. and lat. 7. 

 alt. .'{ lines. 



Terebrattda nnibra, Barrande, 1847, in Haidingefs Ahhandl. 



p. 401. t. 17. f. ■'<. 

 Atry|)a umbra, LXOrb. Prod. i. p. 38. 



Fossil. U. Silurian. Bohemia. 



75. WaLDHEIMIA? UPSILON. B.M. 



Shell subpentagonal, tnincated and indented in front, ventri- 

 cose, smooth ; margins even, slightly arehed in front ; edges 

 thiek, rounded ; valves equally convex, eaeh with two rounded 

 ridges, separated by a shallow sinus, in front ; beak small, late- 

 rally com])ressed, reeuned. Lon. 11, lat. 10, alt. 7 lines. 



Terebratula ujjsilon, Barrande, 1847, in Haidingefs Ahhandl. 



p. 405. t. 15. f. \). 

 .Vtrvjia? upsilon. D'Orh. Prod. i. p. 40. 

 Ilemithyris upsilon, M'Coy, Pal. Foss. p. 207. 



Fossil. U. Silurian. Bohemia ; Wales. 



76. W.\ldheimia ? Juno. 



Shell oval, widely truncated in front, depressed, smooth ; mar- 

 gins even ; valves equally convex, slightly sinuated in front ; 

 beak small, compressed. Lon. 8, lat. 7, alt. 4 lines. 



Terebratula Juno, Barrande, 1847, in Haidinger's Abhandl. 



p. 407. t. 15. f. 10. 

 Atry))a Juno, D'Orb. Prod. i. p. 40. 



Fossil. U. Silurian. Bohemia. 



77. Waldheimia? canalis. 



Shell oval or orbicular, smooth ; both valves with a deep medio- 

 longitudinal furrow ; margins even, deeply indented in front ; 

 beak small, recurved. Lon. 6, lat. 4 J lines. 



Terebratula canalis, J. Sowerby, 18i5!), in Murch. Silur. Syst. 

 p. 611. t. 5. f. 18. 



Barr. Silur. Bohm. p. 410. t. 16. f. 13. 

 Atrypa canahs, D'Orb. Prod. i. p. 40. 

 Fossil. U. Silurian. England; Bohemia. 



