PLATE CIIL 



TELLINA RIGIDA. 



FL^T AND RIDGED TELLEN, 

 GENERIC CHARACTER. 



The Iilnge usually furnislied with three teeth. Shell generally 

 sloping on one side. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Somewhat depressed, siibrotund, thick, with numerous transverse 

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

 posterior end. 



'I'EtLiNA RiGiDA : testa subdepressa subrotunda crassa transverslm 



confertissime striata, postice longitudinaliter ma- 



gis depressa. 

 Tellina crassa. Pemi. Br. ZooL p. 87. .7;. 28 ? 

 Pecttinculus depressior subrotundus, dense et transversim strigatus. 



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



30. Tab. \Z.fg.4. 



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

 shell, says be received it from the coaft of Cornwall. 



