THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL 



Vol. XIII. 



DECEMBER, 1892. 



No. 12. 



CO A^ TENTS. 



Notes on New Rotifers. — 



ROUSSELKT ------ 2^3 



Callidina magna-calcarata. — 

 Parsons - - 277 



Notops clavulatus, Triphyliis 

 laciistris, and Philodina 

 (species .'').■ — Western - - 27S 



The Grasshopper, CEdipoda 

 Carolina; an Introdnctorj 

 Study in Zoology. — Osborn 279 



Microscopic Low Powers. — 

 Griffin ------- 2S2 



The Brine Shrimp of the Great 

 Salt Lake. — Talmage - - - 2S4 



Microscopical Apparatus. — 



A Cheap Microscope Lamp. — 

 (Illustrated) ------ 2S6 



Microscopical Manipula- 

 tion. — Practical Points in 

 Handling Objectives to Obtain 

 Best Definition. Using Oil- 



Immersion Objectives. Gul- 

 land's Method of Fixing Par- 

 affin Sections to the Slide. 

 Geometrical Representation 

 of the Formula for Lenses. 

 Apparatus for Cultivating 

 Anicrobic Micro-organisms on 

 Solid Transparent Media. 

 Growth of Bacteria on Acid 

 Nutritive Media ----- 2S7 



Microscopical NE^^'s. — 

 Mr. E. H. Griffith. Washing- 

 ton Microscopical Society. 

 Postal Microscopical Club. 

 Bausch & Lomb Optical Co. 290 



Microscopical Societies. — 

 St. Louis, Lincoln, Nebr. - 291 



New Publications. — J. W. 

 Q_iieen&Co. Edgar Richards. 

 R. S. Bergh Henle - - - 292 



Notes on New Rotifers.* 



Notops minor, Coxochilus unicornis, and Euchlanis parva. 

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



LONUON. 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 brach- 

 ionus and N. hyptopiis^ 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 ^V. minoi- is only i -250th to 

 I -370th of an inch — that is, only about a quarter of the size of 



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



