I30 C O N C H O L O G Y. 



Sea Stars, Sec. and diftincl from Shells, 

 while, on the other hand, Buonanni and 

 Grew, who rank them with the Teftacea, 

 place them as Univalves ; and Woodward, 

 ArgenviUe, Gualtieri, Breynius, Davila and 

 MevTlchen, all rank them as Multivalves. 



I {hall therefore give my opinion of the 

 rank of thefe animals as follows, viz. that 

 though the Echini, by being a lump of 

 jiaked flefli, merely included or lodged in 

 the Shell, brings them to my definition of 

 Teftacea, and not of Cruftacea ; yet the two 

 orifices in the very fhell for their food and 

 excrements, their fpines and progreffive 

 motion thereby, and their crufts fimilar to 

 that of Cruftacea, approach them fo near to 

 it, that 1 am led to reject them from the 

 order of teftaceous animals : nor can they 

 be properly arranged as cruftacea. There- 

 fore, I would propofe to range them in an 

 order by themfelves. 



Thofc 



