21 
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ie 
cal Society of London, by J. Prestroich, Jr. Esq. 
*©On some of the faults which affect the coal field of 
Coalbrookdale,” the author concludes his memoir 
with some observations on the fossils he procured, 
principally from the ironstone of the coal measures ; 
among the most remarkable were the remains of some 
trilobites, hitherto undescribed. ‘They were pro- 
' cured from a bed of ironstone in the centre of the 
coal measures. No description of these animals be- 
ing, to my knowledge, yet given, it is impossible to 
say what affinities they may have to our Asa | 
erypturus. Mr. Prestrioch, also notices a coleopte- 
rous insect, and ‘another ‘apparently belonging to the 
genus ARANEA, which were obtained from the iron- 
stone nodules.’ The occurrence of these different 
races of animals in the same formation, is certainly 
a very curious and highly important fact. 
Asapuus Microp.Leurus.*. Green. Cast No. 41. 
Clypeo — ?. articulis. abdominis anultis et angustis 3 $ 
cauda depressa, bievi. 
) Tn the magnificent cabinet of fossils tetdueiee to 
John Price Wetherill, Esq. of Philadelphia, there is 
a remarkable trilobite not three-fourths of an inch 
long. What is still visible of this species, is so well 
defined as to leave no doubt that it has not been hither-_ 
to described. ‘The articulations of the middle lobe of 
* The Greek for “ minute ribs,” _ 
