PLATE CIIL 



TELLINA RIGIDA. 



FLAT AND RIDGED TELLEN. 

 GENERIC CHARACTER. 



The hinge usually furnished with three teeth. Shell generally 

 sloping on one side. 



SPECIFIC CHARACTER" 



AND 



SYNONYMS. 



Somewhat depressed, subrotund, thick, with numerous transverse 

 thread-like ridges, and a still deeper longitudinal depression near the 

 posterior end. 



Tellina Rigid a : testa subdepressa subrotunda crassa transversira 



confertissime striata, postice longitudinaliter ma- 



gis depressa. 

 Tellina crassa. Perm. Br. ZooL p. 87. sp. 2S ? 

 Pectunculus depressior subrotundus, dense et transversim strigatus. 



Depressior. Da Costa Br. Conch, j). 194. sp. 



30. Tab. IZ.fig. 4. 



Da Costa, who appears to be the only author that describes this 

 shell, says he received it from the coafl: of Cornwall, 



