THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



Vol XIII DECEMBER, 1892. No. 12. 



CONTENTS. 



Notes on New Rotifers.— I Immersion Objectives. Gul- 



RoussELET ------ 273 I land's Method of Fixing Par- 



Callidina magna-calcarata.— affin Sections to the Slide. 



Parsons ------- ^yy ' Geometrical Representation 



Notops clavulatus, Triphvlus , of the Formula for Lenses. 



lacustris, and Philodina i Apparatus for Cultivating 



(species .'). — Western - - 2781 Anierobic Micro-organisms on 



The Grasshopper, QEdipoda Solid Transparent Media. 



Carolina; an Introductory Growth of Bacteria on Acid 



Study in Zoology.— OsBORN 279 j Nutritive Media - - - - -287 

 Microscopic Low Powers.- Microscopical News.- 



Griffin - - - . - - 2b2 Mr. E. H. Griffith. Washing- 



The Bnne Shrmip of the Great ^^n Microscopical Society. 



Salt Lake.-TALMAGE - - - 284 postal Microscopical Club. 



Microscopical Apparatus.- Bausch & Lomb Optical Co. 290 

 A Cheap Microscope Lamp. — ^ 



(Illustrated) ------ 286 Microscopical Societies.— 



Microscopical Manipula- St. Louis, Lincoln, Nebr. - 291 



tion. — Practical Points in New Publications. — J- W. 



Handling Objectives to Obtain Queen & Co. Edgar Richards. 



Best Definition. Using Oil- R. S. Bergh Henle - - - 292 



Notes on New Rotifers.* 



Notops minor, Conochilus unicornis, and Euchlanis parva. 

 By CHARLES ROUSSELET, F. R. M. S., 



LONDON, ENGLAND. 



Notops minor. — I have found this very small free-swimming- 

 Rotifer on several occasions in Epping Forest, and having ob- 

 tained it again in some abundance, together with Notops brack- 

 iomis and N. hypiopus., at our last excursion to Snaresbrook, I 

 was enabled to study it in detail, with the result that it must be 

 introduced as a new species. (Figs, i and 2). 



In general appearance it much resembles Notops hyptopusy 

 with its odd-looking little foot protruding high up from the ven- 

 tral surface. So nearly does it follow its general characters that 

 I at first thought that it might be the male of this species, but on 

 examination with a high power this proved to be incorrect, as it 

 has a large and well-developed mastax and digestive apparatus, 

 and no sperm sac. The size of N tninor is only i -350th to 

 I -270th of an inch — that is, only about a quarter of the size of 



* Extracted from Jour. Quekett Micr. Society, Vol. IV, No. 30. 



