127 



figures. The " Testaceo-Theologia," of Lepas is embellished with 137 fig- 

 ures of shells, and abounds with physiological and anatomical observations on 

 the structure of these testaceous animals. The principal production of Kleins 

 is " Tentamen Methodi Oslracologiae, &c." published at Leyden, in 1753. 

 Adanson's " Histoire Naturelle du Senegal," was published at Paris, in 1757. 

 This useful work contains a new arrangement of Conchology, and a series of 

 about 400 figures of shells with the animal appertaining to the principal fami- 

 ilies. 



The Testaceological writings of Linnaeus should now be particularly advert- 

 ed to. One of the earliest of his productions on this subject, is the " Fauna 

 Suecica," the first edition of which, was published in 1746, and contains an 

 account of sixty different species of Swedish shells. In the description of the 

 Museum of the queen of Sweden, Linnaeus possessed a more favorable oppor- 

 tunity of treating on testaceology, as her majesty's collection was particularly 

 rich in shells. This work describes 435 species of shells, and appeared in 

 1764. In the interval between the times in which the two last mentioned 

 works were published, Linnaeus brought out a second edition of the '* Fauna 

 Suecica," in which the number of shells described was augmented from 60 

 to 89 species. The "Mautissa Altera" contains 35 species, not described in 

 the other works already mentioned. The " Fundamenta Testaceologiae" 

 was one of the latest of his tracts, and is to be found among the " Disserta- 

 tiones Academicae." These are valuable works in a limited view; but the 

 classification of shells in the " Systema Naturae," from the nature of the un- 

 dertaking is to be considered the most general of all the Linnaean writings on 

 the Testacea. Between the year 1735, in which that work first appeared, 

 and 1767, the " Systema " passed through no less than 12 editions, in all of 

 which, a progressive improvement, and nearer approach to perfection are 

 manifested. 



The third volume of the extensive and costly work of Seba, " Descriptio 

 Thesauri RerumNaturalium "was produced at Amsterdam, in 1758. This part 

 contains, besides plates in other departments, 61 elucidatory of Conchology. 

 This work is certainly valuable for reference to those species which are well 

 known; but a profusion of engravings is expended in figuring examples of 

 shell work, &c, which are entirely unnecessary and useless. 



The magnificent work of Regenfres, " Choix de Coquillages et de Crus- 

 taces," appeared at Copenhagen on the same year as the preceding. The 

 work comprises 12 colored plates, in imperial folio, and each plate compre- 



