80 



PRODUCTA deprcssa. 



TAB. CCCCLIX.— j%. 3. 



Spec. Char. Nearly semicircular, depressed, 

 corrugated, longitudinally striated ; upper 

 portion convex near the beak, concave near 

 the margin ; front abruptly descending. 



Syn. Producta depressa, Suwerhys Genera. 



Jl he numerous striae and concave space around the 

 margin of the upper part, are the distinguishing charac- 

 ters of this species; the front although it descends 

 suddenly, is not very deep ; the Innge line is long, and 

 the sides so expanded near it as almost to form ears j it 

 has no spines. 



The four views before us of this Producta, will serve 

 to illustrate the Genus further than any previously given 

 in this work ; those of the inside shew the muscular im- 

 pressions, with the processes near the hinge in the upper 

 valve, and the crenulated hinge line in the other, which 

 has also two elevations bounding the cicatrices of the 

 muscles; they are all taken from two masses of Dudley 

 Limestone, but are grouped together so as to occupy 

 less space, and the essential parts made rather conspicu- 

 ous. 



I know of no other species in the Dudley Limestone, 

 neither is this found in any other place. 



