PEOCEEDINGS OF THE SOCIETY. 139 



of the fecundation extends not only to the oosphere but also to 

 the wall of the oogonium. This wall increases in thickness 

 after the fecundation, receiving at the same time longitudinal 

 costse on its inner side. 

 Mr. A. D. Michael : 



A new species of Hypopus. 



Eremeus cymha, one of the rarest of the British OribatidaB. ' 

 Dr. Matthews : 



Corticium ahyssi, and other sponges. 

 Dr. Millar : 



Bacteria which convert nitrites into nitrates. 

 Mr. Millett : 



A species of Acetabularia from the Lagunes near Cette. 

 Mr. E. M. Nelson : 



Nobert's 19th band (112,595 lines to the inch), with Powell 

 and Lealand's oil-immersion Jg- (N.A. 1-428), and their vertical 

 illuminator ( x 1000 diameters). 

 Pleurosigma formosum, in balsam. Showing the sieve-like struc- 

 ture, with Zeiss's DD (i) objective (N.A. '81), and dii-ect 

 light from Powell and Lealand's achromatic condenser ( x 950 

 diameters). 

 Micrococcus in balsam, showing flagellum (length - ^ of an 

 inch), with Powell and Lealand's oil-immersion Jg- (N.A. 

 1-237), and direct light with achromatic condenser (x 1250 

 diameters). 

 Lieut.-Colonel O'Hara : 



Crystals in poison of Bunganis ceruleus, an Indian snake. 

 New genus of Homoptera (Colydiidge) from ant's nest in India. 

 Messrs. Powell and Lealand : 



Amphipleura pellucida in phosphorus, with an oil-immersion 4 

 (N.A. 1-47). 

 Mr. B. W. Priest : 



Diastopora ohelia. 

 Mr. S. 0. Eidley : 



Vertical sections of Halichondria panicea Johnston (Crumb-of- 

 bread Sponge), prepared by the method adopted by Professor 

 F. E. Schulze for Euplectella aspergillum (Trans. E. Soc. Edin- 

 burgh, xxix., ii., p. 661). 

 Mr. J. Smith : 



Pleurosigma formosum and P. angulatum, with -j^ immersion- 

 objective. 

 Mr. George Smith : 



Dolerite from Liassic strata, Portrush, Co. Antrim, &c. 

 Mr. J. W. Stephenson : 



Surirella gemma in phosphorus, with catoptric illuminator and 

 Zeiss' homogeneous ^. 

 Mr. C. Stewart : 



Water sjDider imbedded in the nacreous layer of an Anodon. 

 Young sole. 



