89 



ninety-six kinds on the oaks of Central Europe, all but two 

 of them being produced by different species of gall-wasps. 



" Of the nine orders belonging to the class Insecta, few 

 contain gall-makers, Collembola, Thysanura, Orthoptera, and 

 Neuroptera being the exceptions. The present known 

 number of gall-making insects compares thus with Britain 

 and the Continent of Europe : — 



Cynipidcs 

 Tenthredinidcz 



Europe. 

 128 

 12 



Britain. 

 58 

 8 



Tineina 



8 



2 



Cecidomyida 

 MycetopkilidcB 

 Trypelidce 

 Muscidcz 



176 



1 



11 



5 



7 6 

 1 



5 

 2 



Curculionidce 



12 



8 



Aphididce 

 Psyllidce 



12 



12 



8 

 1 



Mr. Fenn exhibited the following shells, collected by 

 Mr. T. D. A. Cockerell on the Niagara River, a few hundred 

 yards above the Falls, on the American side. Planorbis 

 bicarinatus, Say., Pisidium abditum, Hald., Limncea palus- 

 tris, Mull., Cochlicopa hcbrica, Mull., Planorbis parvus. Say., 

 Comdus fulvus, Drap., and said that these six species 

 belong to the circumpolar fauna, and are found in Europe 

 and America, and all of them have occurred within a few 

 miles of London, Planorbis parvus, for instance, in the 

 Thames, and the other five species on Barnes Common. 



He also exhibited Caddis cases of a doubtful species of 

 Helicopsyche, a genus of Trichoptera, received from Mr. 

 Cockerell, and read the following note : — 



"The Caddis cases are from Divide Creek, Garfield 

 County, where they were common on the under surface of 

 boulders in the middle of the stream. Their resemblance to 

 the shells of Valvata is extremely close, as anyone who is 

 familiar with the common British V. piscinalis, or the 

 American V. sincera will admit." 



Mr. Step mentioned that among the collection of Fungi, 



