Dr. Y. Meinert on the Campodefe. 361 



lies, and I retain for his orders the name of families given to 

 them by Savigny and his successors. The entire suppression of 

 the orders in M. Kinberg's sense, and retention only of greatly 

 multiplied families, according to M. Malmgren's practice, is, in 

 my opinion, to be regretted. 



Certain families of recent creation seem to me to be excellent — 

 for example, that of the Spharodorida (Mlmgr.) . It is also with 

 pleasure that I find M. Malmgren reverting to the opinion of Oken 

 and of MM. von Siebold and Max Miiller, and placing the Ster- 

 naspidiE among the Annelida. This author is astonished that, in 

 the year 1865, M. de Quatrefages, in assigning to Sternaspis a 

 place among the Gephyrea, should still mistake the head of these 

 animals for the tail, without taking any notice of the beautiful 

 anatomical investigations of MM. Krohn and Max Miiller. I 

 share in M. Malmgren's astonishment, especially as neither 

 Bianchi (Janus Plancus), Ranzani, nor Delia Chiaje had fallen 

 into the error of Oken and Otto, now corroborated by the au- 

 thority of M. de Quatrefages. 



It is less easy to come to an understanding upon the genera 

 than upon the families in the class of Annelida. Their number 

 has been increased in very considerable proportions both by 

 M. Kinberg and by M. Malmgren. I am far from adopting 

 the views of those naturalists, whose works have nevertheless 

 been of great use to me, as will be seen from nearly every page 

 of the present memoir. The species investigated by them have 

 been examined with extreme care, if not as to their anatomical 

 construction, at least in their external zoological characters. I 

 think, however, that among the characters considered by them 

 to be generic, many have only a specific value, or may even serve 

 at most to distinguish the varieties of a single species. This is 

 the case especially with the denticulations of the setae, as I shall 

 show by more than one example in the present memoir. I have 

 nevertheless retained a great part of the generic groups of MM. 

 Kinberg and Malmgren, but frequently only according them a 

 subgeneric value. As a matter of course, however, among the 

 genera established by these authors there are some excellent 

 ones which every one will accept without hesitation. 



XLV. — On the Campodese, a Family 0/ Thysanura. 



By Dr. Fr. Meinert*. 



Since J. C. Fabricius first drew the attention of entomologists 



to the systematic importance of the organs of the mouth in In- 



* Translated from ' Naturhistovisk Tidsskrift,' ser. 3, vol. iii. p. 400. 

 Copenhagen 1865. The Danish original is accompanied by a plate, from 

 which the woodcuts are copied. 



K 



