66 MEMOIR OF DE GEER. 



Sanatoria. 11. Suctoria, (Pulex.) 



'12. Aucenata,(Lepisma,Podura 9 

 Aptera. 1 Pcdiculus, &c.) 



13. Atrachelia, (Spiders and 



Crabs.) 



\ 4. Crustacea, (Isopoda, Myrio- 

 poda.) 



Gressoria. - 



This arrangement, which has been explained in a 

 separate work by Retzius,* is, in several respects, 

 inferior to that of Linnaeus, the improved editions of 

 whose Systema Naturae had previously appeared. 

 Yet in one particular it was an improvement, namely 

 by the insulation of the Orthoptera, which Linnaeus 

 had confounded with the Hemiptera. The parts of the 

 mouth are taken into consideration in De Geer's sys- 

 tem, and in this respect it may be said to be inter- 

 mediate between that of Linnaeus and Fabricitis. In 

 many instances it must be allowed to be highly natural 

 and worthy of emanating from such a distinguished 

 entomologist, and there can be little doubt that it 

 would have enjoyed more consideration than has fallen 

 to its lot, if every thing of this nature, at the time 

 when it appeared, had not been eclipsed by the cul- 

 minating star of Linnaeus. 



* Car. lib. Bar. de Gee* genera et species Insecfawn, , 8ro. 

 , 1783. 



