194 Df. Maton's a7id Mr. Rackett's 



habiting that country, with the names by which they are therein 

 vulgarly designated, as well as those which serve the purposes of 

 system. The Testacea are arranged under thirty-six genera^ of 

 which ten are of our author's own construction, and derived from 

 his peculiar method of arrangement; the others agree Avith the 

 Linnean classification. 



This work was followed a year afterwards by the first fasciculus 

 of his " AnimaUum Dania et Norvegice rariorum ac minus notorum 

 Icones." 



The Zoologia Danica was completed in 1779- It describes at 

 considerable length all the new and most remarkable species; and, 

 agreeably to the author's scheme of Testaceological arrange- 

 ment, the contained animals are not less minutely noticed than 

 their shells. The Icones were re-edited in 1781 in the same vo- 

 lume with a folio history of the species which they represent ; 

 forming, in fact, the Danish Zoology. We cannot conclude our 

 account of Muller's labours on the subject of the Testacea, without 

 expressing our admiration of the fidelity and perseverance with 

 which he has added to our knowledge of that order of animals. 

 No observer has hitherto done so much towards rendering us fully 

 acquainted with their structure and oeconomy ; and though, as 

 the basis of a system, his researches are not susceptible of so 

 useful and general an application as the more artificial method of 

 Linnaeus, they cannot fail to be of permanent importance to the 

 common stock of natural science. 



FORTIS, 



the Dalmatian traveller, has given a few good figures of Testacea, 

 to illustrate the description of those species which he found in the 

 Porto di Bua. 



rORSKAHL, 



