VERMIOLOGY. 



PLATE CLXXV. 



ECHINUS PENTAPHORUS 

 PENTAPHOROUS, OR FIVE-HOLED FLAT ECHINUS 



Verm. Mollusca. 



generic character. 



Body roundish, covered with a bony sutured crust, and generally 

 furnished with moveable spines : mouth placed beneath, and con- 

 sisting usually of five valves. 



f Flat on both sides : the avenues resembling petals, mouth 

 central, flat, dentated : crown with four pores. 



f Margin sinuate : surface perforated. 



SPECIFIC CHARACTER 

 AND 

 SYNONYMS. 



Orbiculate, depressed : perforations five, oblong, vent near the 

 mouth. 



vol. v. m 



