19 



PKOBUCTUS giganteiis. 



TAB. CCCXX. 



Spec. Char. Transversely oblong;, with dilated 

 sides, and rugose irregular striae, longitu- 

 dinally undulated ; larger valve gibbose. 



Syn. Conch. Anomites giganteus. 3Iartm 

 Fct. Derh. tab. 15. 



Measuring from the edge to the highest part of the 

 gibbose valve the length is equal to the width, but from 

 the front to the hinge it is much less : the expanded 

 sides do not form distinct ears, but are rather pointed : 

 there is in general a more prominent elevation near the 

 front, otherways the undulations are very irregular, and 

 often branched : the strire are extremely irregular, much 

 branched, and inosculated : they are numerous. The 

 cast of the interior is very remarkable, hut not so striking 

 as that exhibited in the next plate, which it somewhat 

 resembles. 



Two views of a Derbyshire specimen given me by 

 Mr. Martin are represented upon this plate ; it is ac- 

 companied by F. Maitini. 1 have the same species 

 from Yorkshire. 



