the fauna of boulder county 23i 



Subclass DINOFLAGELLATA 



With yellow or brown pigment, two or more flagella, and usually a shell of cellu- 

 lose secreted in the form of plates. 



Order DINIFERIDA 



With furrows, one transverse, the other longitudinal (Calkins). 



Family PERIDINIID^ 

 Cross-furrow near middle of body, without wide ledges. 



(10) Peridinium Ehrenberg. Covering of polygonal plates. P. tabiilatum (Ehr.). 



(11) Glenodinium Stein. Covering delicate, without evident structure. G. cinctum 

 Ehr. 



(12) Gymnodinium Stein. Without membrane surrounding body; a complete 

 furrow around body. Our species* has not been identified. 



SuBPHYLUM Mycetozoa De Bary (Myxomycetes) 

 I follow Calkins in placing these with the Protozoa, but the bota- 

 nists regard them as plants. Lister {Guide to the British Mycetozoa, 

 1903) defines the group thus: The Mycetozoa are a group of organ- 

 isms which may be placed on the border-land between the animal 

 and vegetable kingdoms. They are characterized by the constant 

 sequence of three main stages in their life-history, viz. : 

 (i) The firm-walled spore gives birth to a swarm-cell. 



(2) The swarm-cells coalesce to form a wandering Plasmodium. 



(3) The Plasmodium ultimately concentrates to form either 

 sporangia, enclosing numerous spores {Endosporece) , or sporophores, 

 bearing spores on their outer surface (Exosporece). 



A fuller definition is given by Sturgis in The Myxomycetes of Colo- 

 rado, published by Colorado College, 1907. Lister treats the group as 

 a class, Calkins makes it a subclass of Rhizopoda: it is here regarded 

 as a subphylum. 



The Boulder County records are derived from the paper by Sturgis, 

 quoted above, and are based on specimens collected by Messrs. 

 Bethel and Sturgis. 



Class EXOSPORE^ Rostafinski 

 Order CERATIOMYXACE^ 



Family CERATIOMYXID.^ 



(13) Ceratiomyxa Schroeter. C. mucida (Pers.). Sporophores white or pinkish 

 yellow, forming either simple or branching tufts. On rotten logs (Lister). 



