12 SYNOPTIC COLLECTION. 



not followed any one author in the arrangement of the 

 Protozoa of the Synoptic Collection, yet we are chiefly 

 indebted to the above named investigators for the facts 

 upon which the arrangement is based. 



The Synoptic Collection of this Museum, is contained 

 in Room E of the Main Hall. The two central floor 

 cases (A and B) exhibit the classes of invertebrates, 

 while the wall cases are reserved for the vertebrates. 

 The Protozoa are in the horizontal part of section i of 

 case A. These are represented by drawings, models, and 

 fossils, since the animals living to-day are mostly micro- 

 scopic. Beginning with the simplest Protozoan organisms, 

 as represented by Plates 1-6, we pass to more and more 

 differentiated forms until we reach the groups represented 

 by Vorticella and Podophyra. Beyond these and under 

 the Sponges are the Mesozoa, represented by Volvox. 

 All the specimens and plates of drawings in each group 

 are numbered in a continuous series. As a rule we 

 begin at the lower right hand corner of each section, and 

 pass to the left 1 and backward in the horizontal part, and 

 upward in the erect part, ending at the upper left hand 

 corner. Deviations from this rule are owing to the pecul- 

 iar shape or the large size of the specimens. The figures 

 on the plates are also numbered consecutively beginning 

 with the lower left hand corner and ending with the upper 

 right hand corner. 



1 This arrangement is necessary to accord with the arrangement 

 adopted throughout the Museum. 



