385 



June 6th, 1902.. 



Mr. T. A. O'Donohoe : Transverse sections of a Lippmann's 

 colour photograph of the red and blue parts of the spectrum, 

 showing the laminae formed by the action of Hght on the silver in 

 the film. 



Mr. F. J. Cheshire : New method of using Abbe's Apertometer. 

 Graduated disc replaced by ungraduated one, and chord measured 

 instead of arc. (See ante, p. 349). 



Mr. J. W. Barker : Stauroscopic figures with crossed micas--- 

 using a reflecting polariser and monochromatic (sodium) light. 



Mr. J. B. Scriven : Nymph of Blow-fly nearly mature. Tri- 

 polar end-organ of sensory nerve. From each angle extends a 

 nervous expansion, the protoplasm of which is obviously con- 

 tinuous with that of the end-organ. The large cells have double 

 nuclei. 



Mr. K. J. Marks: PJiilodina macrostyla Ehr. If this Rotifer 

 be put into clean water, it drops its floccose covering. Gosse 

 observed a specimen covered with " tubercles," and was led to 

 create a new species, P. tuhercidata ; but in one of his last notes 

 says, " P. tuherculata has 7io tubercles." Found in Sphagnum at 

 Quekett excursion to Chingford, May 24th, 1902. 



Mr. T. G. Kingsford : Hydrometra stagnorum, showing great 

 elongation of head peculiar to this insect. (See article in the 

 May number of " Knowledge," by E. A. Butler.) . 



Mr. A. E. Hilton : Ova of Black Goby, or Rock Fish, Gohius 

 nigra, showing sacs containing embryos with conspicuous eyes. 



Mr. D. J. Scourfield : Simocephalus serrulatus. There are 

 three known British species of this genus of Entomostraca, two 

 of which, >S'. vetidus and S. exsjnnosus, are very common. The 

 species exhibited is very rare, only having been found in three or 

 four localities. It is easily recognised by the sharply-pointed head, 

 with little teeth at the point, and the large blunt process in the 

 position occupied by the shell-spine in Daphnia. From the lake 

 in Kew Gardens. 



June 20th, 1902. 



Mr. W. Wesche : Mouth parts of Hydrotea occulta, (^, show- 

 ing the newly -discovered palpi described at the B.M.S. on the 

 18th inst. 



