( 2 ) 



JOURNAL 



OF THE 



EOYAL MICROSCOPICAL SOCIETY. 



VOL. III. No. 1. 



CONTENTS. 



Tkansactions of the Society — pagk 



I. On a Series of Experiments made to determine the Thermal 

 Death-point op known Monad Germs when the Heat is 

 ENDURED IN A Fluid, By the Kev. W. H. Dallinger, F.E.M.S. 



(Plates I. and II. and 5 figs.) .. .. .. .. ., 1 



II. On a Part op the Life cycle of Clathrooystis iSRUGiNosA 

 (Kutzing's Species). By Professor P. Martin Duncan, M.B. 



(Lend.), F.R.S., F.U.M.S , &c 17 



III. Some Remarks ox the Apertometer. By Professor E. Abbe, 



Hon. F.E.M.S 20 



IV. A Further Contribution to the Knowledge of British 



Oribatid^. (Part I.) By A. D. Michael, F.L.S., F.R.M.S. 

 (with the assistance of C. F. George, M.R.C.S.E. (Plates III. 



and IV.) 32 



V. The Classifioatory Significance op Raphides in Hydrangea. 



By George Gulliver, F.R.S 44 



VI. On a Simple Revolving Objbot-Holder. By Washington i 



Teasdale, F.R.M.S. (2 figs.) 45 



Record of Current Researches relating to Invertebrata, 



Cryptogamia, Microscopy, &c. .. .. .. .. 47 



Zoology. 



Development of the Allantois and the Gastrula of Ihe Veriebrata 47 



Absence of the Amnion in the Chick 49 



Development of Parrots 49 



Development of the Ova of Salamandra miculosa and Angais fragilis .. .. 49 



Minute Structure of Cells 50 



Nudtus in Cell-division 50 



Ganiflion-cells in the Arachnoid Membrane ^i 



Scales of Osseous Fishes 52 



Homologies of the Cephalopoda 53 



I^ew American Cephalopoda 58 



Locomotion of Land Snails 54 



Viviparity of Helix Staderiana 55 



Organs of taste in Heteropoda 55 



Development of the Chitons 56 



Spermatogenesis in Paludina vivipara 57 



Embryology of the American Oyster 59 



New Species of I'olyzoa (>0 



Unicnrneal Eye in TracJieata (Fig. 8) 61 



Blastoderm and Yolk-balh in hisects 63 



Correlation of Mutilation in thu Larva with Deformity in the Imago .. .. 63 



Morphology and Ancestry of Insects 64 



Direction of the Flight of Insects 65 



