THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL., 



Entered at the post-office as second-class matter. 



VOL, XXI. DECEMBER, 1900. NO. 12. 



i- • ■ ===== 



CONTENTS . 



An Australian Collection of Sponges. Fielder. With Frontis- 

 piece. 3 2 7-342 



Notes by Shillington Scales.— C. Baker's New Cata- 

 logue ; R. & J. Beck's New London Microscope ; Develop- 

 ment of Balanus ; Glycerine Mounting Medium ; Parasites 



in the Blood 343-349 



Notes, by L. H. PammEL. — Pollen in Maize; Fragrant Yeast; 

 Chromogenic Microccocus ; Seed Burying Awns ; Diptheria.... 349-352 



New Publications. — Surgical Technology 352 



Index 353-355 



An Australian Collection of Sponges. 



REY. W. FIELDER, F.R.M.S. 



With Frontispiece, 



[Read before the Field Naturalist's Club of Victoria.] 

 Flinders, from its position, has verp many attractions. 

 Stretching northwards from West Head, which serves as 

 a kind of break-water between the ocean on the one hand 

 and the waters of Western Port Bay on the other, is a 

 rocky reef which is partly uncovered at low tide. This 



EXPLANATION OF THE PLATE. 



A. — Colony of Sycon raphanus showing- two adult individuals and 

 two small ones in the olynthus stage. 1,2,3,4. — Ovuni in various stag- 

 es of segmentation ; 5, blastosphere ; 6,7, pseudo-gastrula. 



B. — Portion of a section of the Sponge, Grantia labyrinthica, show- 

 ing an embryo breaking loose from the embryo-containing cavity 

 into a flag-ellate chamber. 1, blastosphere [late stage] ; 2, amphi. 

 blastula ; 3, gastrula ; 4, three-layered embryo ; 5, olynthus [section] - 

 6, olynthus [external appearance]. 



