10 COXXECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



which I have found. \Vherever I have been able clearly to 

 identify the specific names, or the probable specific names, of 

 the animals described, I have given these names in the follow- 

 ing report, but in cases where I have not yet determined the 

 species I have always indicated it by the sign sp ( ?) . Some 

 of the species thus marked are doubtless new species. It has 

 been evident in the course of the study that it is possible to 

 create many neiv species out of the types found in Connecticut, 

 if it is so desired. But in the present report it is not thought 

 wise to do this. In the later report the discussion of the ques- 

 tion of species will be given more thoroughly. 



The figures which accompany this report are drawn to scale, 

 so as to be directly comparable in size. In the Rhizopoda 

 and Infusoria, Plates I-V and Plates XI-XXXIV, the figures 

 are all magnified 500 diameters, except in a few cases where 

 otherwise noted. In the Flagellata, Plates VI-X, the figures 

 are magnified 1,000 diameters, unless otherwise stated. A few 

 very large animals could not be so highly magnified, and where 

 such is the case the amount of magnification is stated on the 

 figure. There is a certain disadvantage in drawing to the same 

 scale figures of animals differing so widely in size, since it 

 makes it impracticable to arrange figures on the plates in their 

 proper order in all cases. Using the same scale, also, makes 

 some figures unnecessarily large and others too small for the 

 best results. But the practical advantage to the student of 

 learning directly from the figures the relative size of all the 

 animals figured is very great. This advantage of being able to 

 determine the relative sizes at a glance, rather than needing to 

 make a calculation for the purpose, has appeared to me to 

 offset very decidedly the disadvantages that come from using 

 figures of such varying sizes. 



Nearly all the specimens described in this paper have been 

 found in the waters of Middletown. Collections of materials 

 have also been made from other localities in the State, and 

 many of the species described have been identified elsewhere. 

 A few of the specimens described have been found in other 

 towns, but not yet in Middletown, although probably nearly all 

 types of Protozoa will be found more or less uniformly dis- 

 tributed over the State. This question of distribution will not, 



