PLATE CXXII. 



MYA OVATA. 



OVATE MYA. 



GENERIC CHARACTER. 



Animal an afcidia. Shell bivalve, gaping at one end. The hinge 

 for the most part furnished with a thick, strong, and broad tooth, not 

 inferted in the opposite valve. 



SPECIFIC CHARACTER. 



Shell oblong-ovate; posterior part roundish, and very slightly gaping ; 

 first tooth at the hinge crenulated. 



Mya ovata : testa oblongo-ovata, postice rotundata vix hiante, car- 

 dinis dente primario crenulato. 



This is the Shell alluded to in the description of Plate 101, under 

 the name of Mya ovata. The difference between it and Mya depressa, 

 as before observed, seems to consist in the present being more ovate, 

 and not depressed across the middle : nor is the gaping at the broadest 

 end so considerable as in the other. 



These, we have already remarked, inhabit the same waters as Mya 

 depressa, viz. in the New River, near London, and the Froomc in 



