VERMIOLOGY. 



PLATE CLX. 



ECHINUS ATRATUS 

 VIOLACEOUS-BLACK ECHINUS 



Zoophytes. 



generic character. 



Body roundish, covered with a bony sutured crust and usually 

 furnished with moveable spines : mouth placed beneath and generally 

 five valved. 



SPECIFIC CHARACTER 

 AND 

 SYNONYMS. 



Hemispherical oval and slightly depressed ; with very short 

 obtuse truncated spines, those round the margin club-formed and 

 depressed. 



Echinus Atratus : haemispherico-ovalis depressiusculus : spinis 

 truncatis brevissimis obtusissimis : marginalibus 

 clavatis depressis. Gmel. Linn, Syst. Nat, 

 3177, 11. 



