19 



The larval condition of some Insects is represented by 

 some well defined thougli small caterpillai's, both in the 

 Purbecks and Lias. It is worthy of notice, that in the 

 Solenhofen Jura Kalk, none have been met with, but they 

 are abundant in the more modern Tertiary marls, limestones, 

 and paper shales, at CEningen and Bonn, (brown coal.) 



Among the Articulata, Spiders and Scorpions were to be 

 looked for, and these have been found, though rarely, in 

 strata containing Insects, especially in the Coal Measures. 

 I have not however found any traces of either in the 

 Purbecks, and only one (probably aquatic and freshwater,) 

 Spider, of small size, in the Lias, and as yet no Scorpions, 

 though doubtless both existed contemporaneously with the 

 Insects. The most remarkable specimen of a fossil Spider, 

 is one which was obtained from the Carboniferous series in 

 Bohemia, which is probably unsurpassed in its wonderful 

 state of preservation and perfection. It is rather singular 

 that no marine Arachnidoe have been detected either in the 

 Lias or other formations, since marine spiders of the genus 

 Nymphon, of very large size and in great numbers are 

 found at the present day in deep water at a low temperature, 

 especially in the Antarctic regions. * Of the pseudo- 

 Scorpions a most beautiful and entire specimen is figured 

 and described (as well as the Bohemian Spider,) by 

 Mr. Woodward. It was obtained from the Coal iron stone 

 in Staffordshire, the finest yet discovered ; and belongs to the 

 same species as another and previously recorded specimen, 

 from Colebroke Dale, figured and described in the Bridge- 

 water Treatise as a Curculio. Two entire views of it are 



Thomson's Depths of the sea. 



