PROCEEDINGS OF THE SOCIETY. 507 



bones, butterflies, &c, can be thrown on the screen in their natural 

 colours by simply placing them on the table inside the apparatus. A 

 simplified Microscope is also attached to the epidiascope so that the 

 microscopic preparations (ordinary micro-slides, &c.) can be projected. 



The details of construction were explained by sectional drawings 

 shown on the screen, and a variety of objects, such as bones, medals, 

 butterflies, &c. were projected in illustration of the instrument's capa- 

 bilities. The illuminant is a remarkably steady and silent electric 

 search-light of 3000 candle-power, and microscopic slides were shown 

 under high magnifying powers giving pictures of about 5 ft. diameter 

 with great brilliancy and sharpness of definition. At the close of the 

 Meeting a further demonstration was given, when a large number of 

 miscellaneous objects, including some live tadpoles, entomostraca, &c. 

 were projected on the screen with excellent effect. 



The thanks of the Society were cordially voted to Messrs. Zeiss for 

 their exhibit. 



Prof. Marcus Hartog gave a short account of the structure of 

 Acinetines from observations on a species (Choanophrya infundibulifera) 

 epizoic on Cyclops : he demonstrated (1) that the spiral marking of the 

 tentacles was due to a double- threaded constriction ; (2) that in pro- 

 trusion and retraction there was no torsion, but only an opening and 

 closing of the spiral ; and (3) that the tentacles were continued deep 

 into the endosarc of the creature. He illustrated his remarks by 

 drawings on the board, and by the exhibition of living specimens and 

 sections under Microscopes, and thought the observations afforded an 

 explanation of the process of absorption carried out in the Suctorial 

 Infusoria. He mentioned that this species, though apparently seen only 

 by Zenker in 1866 and himself, was very common, as it was to be found 

 adherent to adults of species of Cyclops, but must be looked for upon 

 the ventral surface among and on the circum-oral appendages. 



The President expressed the thanks of the Society to Prof. Hartog 

 for his kindness in bringing these objects to the Meeting, and for the 

 very interesting remarks made concerning them. 



Mr. C. F. Rousselet read a paper " On the genus Syncliseta, with a 

 description of five new species," the subject being well illustrated by 

 drawings shown on the screen by means of Zeiss's Epidiascope, and by 

 numerous preserved and mounted specimens under Microscopes kindly 

 lent for the occasion by Mr. Pillischer. 



The President and Secretary being obliged to leave early, then- 

 places were occupied respectively by Dr. Braithwaite and Mr. Karop. 



Dr. Braithwaite felt sure that all who had heard this paper would 

 heartily join in thanking Mr. Rousselet for it. It could not fail to be 

 regarded as a valuable contribution to their knowledge of this genus, 

 and it showed also what could be done by a person who, like Mr. 

 Rousselet, persistently followed up the same subject instead of deviating 

 into a variety of orders and adding but little to our knowledge of them. 



The thanks of the Society were, on the motion of the Chairman, 

 unanimously voted to Mr. Rousselet for his paper. 



