93 



umbo central ; lateral teeth large, prominent. Jnfide 

 glolTy white. Length an inch and a half ; breadth an inch 

 and three-quarters. Worn fliells frequently become deeply- 

 furrowed or zoned, with grey, or flate-colour, and fome, 

 times vellow. In this Rate it is figured in the Britijh Zo- 

 ology, as well as the perfeft fhell. 



Da Costa has given the figure of a worn fliell for his 

 Trigonella zonaria; and the perfefcl fliell he makes diftin6L 

 by the name of Trigonella Gallina; and fays that, it is by 

 the common people of Cornwall called Hens. He is per- 

 haps right with refpeft to the vulgar name, as we find it 

 fo called in fome parts of DevonJJiire. It is therefore per- 

 fectly clear that the MaSlra Solida of Pennant, and the 

 Trigonella zonaria, and Gallina of Da Cost. a. are no- 

 thing more than this fpecies in various ftates. 



It is one of the moll common fhells on the fouth coad 

 of Devon, and frequently taken by the common people 

 about Dartnioidh for culinary ufe. 



Trigonella fubtruncata. Da Cofta. p. 19S. Subtruncata. 



Mactra Stultorum. Br. Zool. t.52 f.42. 



M. with a fl:rong, fub -triangular, yellowifh-white fiieli, 

 tranfverfly ftriated, with fometimes a few ridges; round- 

 ed on one fide, the otlier more pointed and longer ; umbo 

 large, prominent, the fides near the beak much turned 

 inv/ards, efpecially the anterior, which is depreffed into a 



cordiform 



