Historical Account of Testaceological JFrifos. 153 



The natural history of the Finna:, and the formation of Pearls, 

 were elegantly and amply treated of in a memoir which appeared 

 in the volume for 1717- 



The " T/tesaio'us Auimalium" of 



RUYSCII 



contains several figures of shells grouped with corals and other 

 substances, as they stood in the museum; but, his book being a 

 mere catalogue, the descriptions are of little use. The 6th plate, 

 which is admirably engraved, exhibits the shell and contained 

 animal of a species of Voluta, which he calls Buccininn Guicnense. 

 Most of the shells figured in this work are natives of the Indian 

 seas. 



The countryman and contempory of Reaumur, and Avhose only 

 treatise relative to Testacea appears among the memoirs of the 

 same learned body, 



MERY, 



wrote some remarks on the common river muscle, which are both 

 elaborate and diffuse. The anatomical structure of the animal is 

 considered ; and we find other descriptions of a miscellaneous na- 

 ture : but this author seems to have borrowed pretty largely from 

 the labours of others. 



MORTON, 



the natural historian of Northamptonshire, notwithstanding the 

 number and elegance of his engravings of fossil shells, and his 

 mention of many species of the recent kind, unfortunately has 

 presented us with only two figures of the latter, which occur in 

 his 13th plate: his description of them, however, is in general 

 illustrated by references to Lister. 



VOL. VII. X CYPRIANUS, 



