374 PROCEEDINGS OF THE CONCHOLOGICAL SOCIETY. 



Mr. Darbishire also exhibited specimens of Unio tuniidus 

 from a pond near Birmingham, measuring severally 10.6 centi- 

 metres in length, 5.5 centimetres in height, and about 4.0 centi- 

 metres in thickness, all of unusual thickness in the valve and 

 weight ; colour black in all ; umbonal abrasion of the epidermis, 

 but without erosion. 



Also specimens of the same species Unio tumidus from 

 another pond near Birmingham of the following dimensions in 

 centimetres : — 



Colour, black or dark brown ; 2, 5, and 6 with a slight lateral 

 depression and corresponding concavity in the ventral curve. 

 These shells were all notably heavy. 



Also, from the same pond as the last lot, specimens of Unio 

 pictormn of the following dimensions : — 



These shells are blackish brown and lighter brown ; all the shells 

 were in the best health, very heavy, with thick epidermis, and 

 more or less umbonal erosion. Some showed a slight incurvation 

 on the ventral margin, and all well developed massive posterior 

 rostration. The pool from which these two series were taken is 

 a large pond with a slight current through it, about 8ft. to loft. 

 deep, where the shells were, with a gravelly bottom and a certain 

 amount of dead leaves. The water was not tested for lime. By 

 a fortunate hap the two largest U. t. and U.p. came up in the 

 same haul, otherwise these great shells were scattered, and 

 somehow the abode of younger ones was not found. 



Mr. Darbishire owed the capture to a friend at Birming- 

 ham, who gave kind personal help and a pleasant walk. 



Mr. W. E. CoUinge gave notice of his intention to move 

 the following Alterations of Rules at the Annual Meeting :■ — 



J.C, v., Oct., 1S8S. 



