GLASGOW SOCIETY OP FIELD NATURALISTS. 67 



of the other sub-kingdoms, especially the class Insecta, where full 

 lists of the Coleoptera, Neuroptera, Trichoptera, Lepidoptera, 

 H emiptera, and Diptera are wanted. Of the Trichoptera a partial 

 list was given in the present paper, which he hoped largely to 

 increase and to complete during the present year. Of the Lepi- 

 doptera the only truly aquatic representatives found so far all 

 belong to one family, the Hydrocampidse. Out of the six British 

 representatives of the aquatic family, there have occurred in the 

 Marsh Catadysta Lemnalis, Hydrocampa Nymphcealis, and H. 



Of the MoUusca a full list was given (with the exception of the 

 Polyzoa, and the genus Pisidium of the Lamellibranchiata ; one or 

 two species of the latter occui-, but are not yet named). The 

 species are as follows : — Succinea putris, Planorhis albus, Physafon- 

 tinalis, Lymncea peregray L. stagnalis, L. palustris, L. truncatula, 

 Bythinia tentaculata and var. decollata, Valvata piscinalis, V. 

 cristata, Dreissena polymorpha, Cyclas cornea, and C. lacustris — 

 thirteen species, of which three may be considered as introduced : 

 Lymncea stagnalis and Dreissena polymorpha certainly, and Cyclas 

 lacustris probably. D. polymorpha is introduced into the list of 

 species for Possil Marsh proper from a single living specimen 

 having been found within its limits, an escape from the adjoining 

 canal, where it has long been known to occur in great numbers. 

 It may be mentioned that no species of mollusc is known to be 

 found in the canal here which has not also occurred in the Marsh. 

 In conclusion, the compilation and completion of a full account of 

 the Fauna and Flora of the Marsh was advocated, and if possible 

 to appear in next year's Transactions. A number of living 

 MoUusca and aquatic insects in various stages of development were 

 exhibited in illustration of the paper; also collections of the 

 MoUusca and Trichoptera (partial) of the Marsh. 



14th July, 1874. 

 Mr. Peter Cameron, jun., Vice-President, in the chair, 

 Mr. D. S. Carson was elected a resident member. 



SPECIMENS EXHIBITED. 



By Mr. F. G. Biijnie. — Trochilium crabroniforme, Lewin, from 

 Possil Marsh. 



By Mr. Peter Cameron, Jun. — The fossorial wasp Pompilusi 



