642 PROCEEDINGS OF THE SOCIETY. 



The following Instruments, etc., were exhibited : — 



The Society : — An Old Microscope, by T. Harris and Son, 52 Great 

 Russell Street, Bloomsbury, presented by Mr. Radley ; and the 

 following Apparatus, presented by Mr. J. E. Ingpen : An Immersion 

 Paraboloid, devised by Dr. Jas. Edmunds ; an Abbe Diffraction 

 Plate, Diaphragms and Carrier ; the Zeiss " aa " Objective used by 

 Professor Abbe in demonstrating his Diffraction Theory ; a Powell 

 and Lealand Sub-stage Condenser for Oblique Illumination. 

 Mr. D. J. Scourfield : — Simocephalus exspimsus. (1) Ordinary parthe- 



nogenetic female, (2) ephippial female, (3) male. 

 Mr. A. Earland : — A series of seventy-one Lantern-slides of Forami- 

 nifera, shown on the screen in illustration of his exposition of 

 Mr. H. Sidebottom's paper. 

 Mr. F. Martin Duncan : — The following specimens were exhibited under 

 microscopes, in illustration of his paper, " On Mounting and Pre- 

 serving Marine Biological Specimens " : — 



Pachymatisma johnstonia. Killed and preserved in alcohol. 



Stained with borax-carmine. Mounted in Canada balsam. 

 Medusa, Cladonema radiatum. Narcotized with 1 p.c. cocaine- 

 hydrochloride. Preservative, 4 p.c. formaldehyde. Mounted 

 in 3 p.c. formaldehyde. 

 Hydractma eclunata. Narcotized with menthol. Killed and 

 preserved in 70 p.c. alcohol. Stained picro-carmine. Mounted 

 in Canada balsam. 

 Medusa, Obelia genicuJata. Killed and preserved in 4 p.c. formal- 

 dehyde. Mounted in 3 p.c. formaldehyde. 

 Sertularia pimiila. Narcotic alcohol. Killed and preserved in 

 70 p.c. alcohol. Stained carmine. Mounted in Canada balsam. 

 Expanded Polyps of Gorallium ruhruni. Narcotized with 1 p.c. 



cocaine-hydrochloride. Preserved in 70 p.c. alcohol. 

 Larval stages, Balaniis halanoides. From Tow-net collection. 

 Killed and preserved in 10 p.c. formaldehyde. Mounted in 

 3 p.c. formaldehyde. 

 Antfmra gracilis. Killed and preserved in formal-alcohol. Stained 

 picro-carmine. Cleared in turpineol. Mounted in Canada 

 balsam. 

 Chelura terebans. Same method as in A. gracilis. 

 Podocerus fcdcatus. „ „ „ 



Embryos of Goby. Preserved in 10 p.c. formaldehyde. Mounted 

 in 4 p.c. formaldehyde. 



