THE FAUNA OF BOULDER COUNTY 237 



The Plasmodium now feeds saprozoically, and as it grows, greatly 

 multiplies its nuclei. According to Lister, this multiplication of 

 nuclei appears to take place by simple division, without karyokinesis ; 

 but in a single case (in Badhamia utricularis) he observed very char- 

 acteristic karyokinetic figures, which he illustrates. In the formation 

 of the sporangium, there is at a late stage a karyokinetic division of 

 nuclei into two, resulting in a mass which presently divides into two 

 spores. The colonial interpretation of the mycetozoan structure— 

 and certainly the plasmodium must be regarded as a colony— sug- 

 gests close affinity with the mastigophora. 



Dr. W. C. Sturgis writes me that he is equally unwilling to class 

 the mycetozoa as plants or animals, but would treat them as a border- 

 group. He also gives me the following very interesting information: 

 "No certain example of a hybrid is known. I have seen a compound 

 form develop on top of another simultaneously, with no sign of 

 mixed characters. I have also seen two and even three simple forms 

 so closely disposed that, when transformed to sporangia, the latter 

 were inextricably mixed; yet the characters of each species remained 



absolutely normal." 



SuBPHYLUM Sporozoa 



Parasitic forms, without cilia or flagella, "but capable of moving from place to 

 place by structural modifications of one kind or other" (Calkins). Reproduction 

 mainly by spore formation, which is either asexual (schizogony) or sexual (spo- 

 rogony). 



Class TELEOSPORIDA Schaudinn 



Sporozoa in which sporulation ends the life of the individual. 



Order GREGARINIDA 



Suborder Eugregarin^ Leger 



Reproduction apparently limited to sporulation, division occurring, if at all, 

 within the host cell and during the young stages (Calkins). 



Family MONOCYSTID.S: (Acephalinae Kolliker) 

 (36) Monocystis Stein. The boat-shaped spores occur in the seminal reservoirs, 

 of the earthworm; observed in Boulder by Dr. Ramaley and Mr. W. E. Watkins. 



Family GREGARINID.^ Labbe 

 Gregarines parasitic in insects are doubtless numerous with us, but none have 

 been examined. A brief search in grasshoppers {Mdanoplus) was without result. 



