Proceedings. 99 



MICROSCOPICAL AND NATURAL HISTORY 

 SECTION. 



Ordinary Meeting, February 13th, 1888. 



The President, Professor WILLIAMSON, F.R.S., in the Chair. 



Mr. H. L. Earl, B.A., Manchester Grammar School, 

 was elected an associate of the section. 



There were exhibited : — 



By Mr. R. C. CUNLIFFE, — Volcanic dust, from Krakatoa 

 in the Straits of Sunda, and from Tarawera in New 

 Zealand. 



By Mr. Thos. ROGERS, — specimens of the pearl mussell, 

 Unio margaritifer, from the river Lune ; the only recorded 

 locality for this species in Lancashire. First discovered by 

 David Dyson about forty years ago, and re-discovered by 

 Robert Standen in 1887. 



By Mr. H. C. Chad WICK, — specimens of three species 

 of Bagnla. 



By Mr. H. Hyde, — specimens of Chalk, from the 

 Brighton coast, and from the Channel tunnel. 



By Mr. J. C. Melvill,— the P of a Hymenopterous 

 insect from West Columbia, of which the ovipositer was of 

 the extraordinary length of 5j^ inches, the insect itself 

 being less than three-quarters of an inch long. 



The President described two forms of reproductive 

 gemmules developed on the roots of two species of mosses 

 grown in one of his hot-houses. One of these mosses was 

 Webbera nutans, on which these gemmules were pyriform. 

 The other was an undetermined moss, on which the gemmules 

 were circular like those fio-ured in the LeJirbucJi of Sachs. 



