402 BIOLOGY OF THE PROTOZOA 



Group 2. Parasites of the digestive tract 



1. Macronucleus simple; bar, band, sphere, 



etc .- • • ^ 



Macronucleus branched {Polydora parasite) 



Genus Rhizocaryum 



2. Without anchormg apparatus or suckers, 



etc 3 



With spicules, suckers, spines or other 

 apparatus 4 



3. Body pyriform; canals of medusse. . . Genus Kofoidella 

 Body vermiform; rounded both ends Genus Anoplophrya 



4. With attaching spine 5 



With sucker-like region; vacuole a long, 



lateral canal 8 



5. With vestigial oesophagus (Tubifex para- 



site) Genus Intoschellina 



Without traces of gullet 6 



6. Anterior end obliquely truncate; spicule 



internal Genus Mesnilella 



Spicule protrudes from anterior end 7 



7. Spicule a conspicuous spine {Lumhricus 



parasite Fig. 165) Genus Hoplitophrya 



Spicule a mere external hardening . . Genus Maupasella 



8. With two anterior spines Genus Steinella 



No anterior spines 9 



9. With anterior sucker and neck-like con- 



striction Genus Discophrya 



With anterior sucker without constriction 



Genus Haptophrya 

 Group 3. Coelomic parasites 



1. Without contractile vacuole; anterior ros- 



trum. Genus Herpetophrya 



With contractile vacuole 2 



2. Vacuole single, posterior; copepod parasites 



Genus Perezella 

 Numerous vacuoles; distributed; copepod 



blood Genus Collinia 



Group 4. Parasites of branchial cavity, gonads, uterus, etc. 

 Vestigial mouth and gullet ; snail uterus Genus Prolophrya 

 Parasite of echinoderm gonads Genus Orchitophrya 



Sub-order 2. Gymnostomina, BIjtschli. 



1. Parasites; thickened cortex; narrow trench 



to mouth Family 1. Nicollellid^ 



Free or parasitic ; no thickened cortex .... 2 



2. Mouth terminal; usually closed. .Family 2. Enchelinid^ 

 Mouth not terminal 3 



3. Anterior end more or less proboscis-like 



Family 4. Trachelinid^ 

 Anterior rounded; usually with oral basket 



Family 3. Chlamydodontid^ 

 Family 1. Nicollellidae, Chatton. 



1. Thick cortex not more than half ventral 



side Genus Nicollella 



Thick cortex more than half ventral side 2 



