349 



January 19th, 1900. 



Mr. C, F. Roiisselet : Mounted specimens of six species of 

 Lacinitlctria, viz. L. socialis, L. pedunculata, L. natans, L. reticu- 

 lata^ L. stHolata, and L. elliptica, all except the first from Victoria, 

 Australia. (See Note p. 313.) 



February 2nd, 1900. 



Mr. E. M. Nelson : Tubercle Bacilli shown with Wollaston doublet. 



Mr. J. T. Holder : Section through the tentacular fringe bordering 

 the inhalent aperture of the Fresh -water Mussel (Anodonta cygnea). 



Mr. H. Morland : Front and side views of Actinodiscus harha- 

 densis, Greville, from Jackson's Paddock, Oamaru, New Zealand, 

 showing the depth of the undulations. 



Mr. A. Earland : Three forms of Frondicidaria alata, d'Orbigny, 

 from Cape Cruz, Cuba, 170 fathoms. (1) Adult normal shell; 

 (2) young normal shell ; (3) young shell of " flabelline " variety. 

 In the latter the early chambers are arranged spirally instead of 

 in a straight line as in the normal forms. The normal shells are 

 megalospheric, i.e., the primordial chamber is of large size, 

 whereas the flabelline variety is microspheric. This may possibly 

 be, a sexual dLstinction, 



Mr. J. B. Scriven : Two sections of compound eye of Blowfly. 



(1) Trachea passing through limitary membrane of retina. 



(2) Ehabdomes of dioptron passing through the limitary mem- 

 brane. These two sections show the rhabdomes and tracheae 

 of the dioptron passing together through the outer limitary 

 membrane of the retina, the same opening in this membrane 

 being often found occupied by one trachea and one rhabdome. 

 The trachese pass more obliquely than the rhabdomes ; the fibres 

 of the latter distinctly join those of the retina. 



February 16th, 1900. 

 Mr. C. Rousselet : Mounted specimen of Leptodora hyalina, 

 from the Regent's Canal, Regent's Park. It was taken in 1897, 

 this being, so far as known, the first record of this remarkable 

 hyaline Water- flea anywhere near London. A few more 

 specimens were taken at the same place in 1898. Figures and 

 descriptions of this rare species will be found in the J.R.M.S. 

 and the "Midland Naturalist" for 1879, the year in which it 

 was first discovered in England. 



Journ. Q. M. C, Series II. — No. 40. 25 



