384 



Mr. D. J. Scourfield : Living specimens of Diaptomus vulgaris 

 ^ and $ , collected at the Club's Excursion to Richmond Park. 

 This finely -coloured species is not very common in this country. 

 It is intermediate between the well-known D. castor and the 

 very common D. gracilis, but nearer the latter. 



Mr. C. F. Rousselet : Brachionus quadratus, with spiny resting 



egg- 

 Mr. C. Lees Curties : Pollen grain of Evening Primrose, 



emitting tube. 



Mr. W. Wesche : Linmias ceratophijlli, a tube-building Rotifer. 

 The smaller tubes are built on the parent's tube. From Dollis 

 Hill, N.W. 



May 16th, 1902. 



Mr. K. J. Marks : Transverse section of stem of Cyperus longus 

 Linn, (or "Galingale"), showing the indiscriminate manner in which 

 the fibro-vascular bundles run through the fundamental tissue, 

 essentially characteristic of the Monocotyledons. Several bundles 

 pass from the stem to each leaf. 



Mr. A. Earland : Siliceous Tetractinellid Sponge Spicules from 

 anchor mud, Grenada, West Indies, ex. S.S. Roddam. Abundant 

 in anchor mud of this locality. Figured in Bowerbank as 

 " Spicules of an unknown Sponge." I have found similar spicules 

 in muds from many tropical localities. |-in. objective and 

 Lieberkiihn. 



Mr. A. Earland : Scoriae and Volcanic Ash from Vesuvius. 

 Dredged in Bay of Naples, 100 fathoms. 



Mr. A. E. Hilton : Head of Hairy Bee, Dasypoda kirtipes. 

 Mounted in glycerine, without pressure, showing the organs of 

 the mouth in their natural form and colour. 



Mr. J. W. Barker : Spiral crystallisation under polarised light 

 with selenite. Film of gum-water solution of copper and 

 magnesium sulphates, 3 to 1, crystallised at 24° 0. 



Mr. F. J. Cheshire : Four exhibits in illustration of his paper 

 and notes — (1) Calibration of condenser-scale with immersion 

 objective ; (2) Curious images produced by zonal aberration; (3) 

 Images of wire gauze in back focal plane in objective; (4) 

 Reflecting polariser. 



