INTEODUCTION. 19 



original observations, but is carefully executed, and 

 fully answers to the title. 



Mr. Templeton's memoir^ on the genus Cermatia, 

 and some other exotic Annulosa, contains a description 

 of a new species of Lejpisma, for which he proposes the 

 name L. niveofasciata ; some observations on Linneeus' 

 L. pohjpoda, which he considers may perhaps prove to 

 be the species now known as Machilis 'inaritwius ; and 

 some remarks on the relations of Lejnsma to Poclura. 



In the same year M. JSTicolet published his 'Recherches 

 pour servir a I'histoire des Podurelles,'^ one of the 

 most important contributions to our knowledge of the 

 group which has yet appeared. In this excellent 

 memoir M. Nicolet gives a full account of the external 

 and internal anatomy of the group, and describes each 

 species in detail. The plates, which are nine in number, 

 are well executed, and many of the species are carefully 

 coloured. Unfortunately MM. Nicolet and Bourlet 

 were ignorant of one another's labours, and in many 

 cases the same species is described by them both under 

 different names. M. Nicolet gives (p. 6) the following 

 table of the genera : — 



1 ' Trans. Eiit. Soc. London,' 1842, p. 304. 



2 ' Nouveanx Memoires de la Societe Helvetique des Sciences Natu- 

 reUes,' 1842. 



