16 LABORATORY DIRECTIONS 



17. (18) With bristles arranged on certain segments (if no 

 bristles then a sucker on each end of body) ; without tracheae or 

 spiracular openings, never with large tufts of bristles at one end 

 of body. 



PHYLUM COELHELMINTHES, CLASS ANNELIDA (see page 17) 



18. (17) With tracheae and tracheal gills or spiracular 

 openings; often with large tufts of bristles at one end of body; 

 with a head well differentiated and always with some form of 

 antennae and mouth parts. PHYLUM ARTHROPODA, CLASS INSECTA 



Oarvae^ ...(see oatfe 17^ 



/ ' \ CO I J 



19. (16) With jointed appendages at least on extreme ante- 

 rior segments. PHYLUM ARTHROPODA...: (see page 17) 



I. PHYLUM PROTOZOA 



1. (2) No locomotor structures in adult stage; parasitic 



CLASS SPOROZOA 



2. ( I ) Special structures for locomotion 3 



3. (4) Temporary lobes (pseudopodia) protruded for lo-' 

 comotion CLASS RHIZOPODA 



4. (3) Permanent processes (cilia or flagella) from the sur- 

 face of body for locomotion 5 



5. (6) Numerous short protoplasmic processes (cilia) 



CLASS CILIATA 



6. (5) Small number of long thread-like protoplasmic pro- 

 cesses ( flagella ) ~ CLASS FL AGELL ATA 



II. PHYLUM PORIFERA 



The Phylum Porifera is represented in fresh water by but 

 a single family SPONGILLIADE belonging to the ORDER SILICI- 

 SPONGIAE. 



III. PHYLUM COELENTERATA 



Nematocysts present. Polyp without ectodermal esophagus 

 Solitary polyps without medusae or medusa buds..... 



CLASS HYDROZOA, ORDER HYDRARIAE 



