PAPERS OX BIOLOGY AND AGRICULTURE 191 



GENERAL SURVEY OF THE FAUNA OF LAKE KNOX — Continued 

 3. Infusoria — Concluded 



Order Heterotricha 



Spirostomum (rare) 

 Stentor poli/morphus 



An attached form, only a few specimens of whicti 

 were seen. 

 Order Hypotricha 



StylonicJiia 

 Order Peritricha 



Vorticella cajnpanula 



This well known Torticella was found also many times 

 among the Elodea of Station lY. 

 Carchesium, a colony vorticella, was found on a beetle 



larva. This form contracts independently. 

 Zoothamium 



Contract together and were found on the legs of a 

 dead crustacean {gammaru^) . 

 Phyliun Porifera 



No fresh water sponges were found, but they are reported as 

 having been found there. 

 Phylum CoeJenterata 



Order Hudrazoa 



Fresh water hydra were found in the pond several times 

 but the exact station was not known. They were seen 

 attached to the bottom of the glass dish in which the 

 water was placed. 

 Hydra viridis 



Green hydra. 

 Hydra vulgaris 



Whitish hydra. 

 Phylum Plathelmlnthes 



Class Turhellaria 

 Planaria tova 



This almost black worm was found in great numbers 

 at Station II among the dead grasses at the bottom. 

 Planaria velata 



Is a much larger whitish one measuring 16 mm. in 

 length. This was foimd at the same station. 

 Class . Trematodes 



Two kinds were found but were not identified. One was a 

 small pinkish one on a Gammarus. The other, longer 

 and more slender, was parasitic on the swimmerets of 

 the crayfish. 

 Phylum Xemathelminthes 

 Class Gordiacea 



Paragordus variiis 



This small hair worm was the only round worm found. 

 It was a small worm with a white head and a dark 

 band behind the head; and was found near the sur- 

 face of the water at Station Y. 

 Phylum Trochelminthes 

 Class Rot if era 



Order Bdelloida 



Family PJiilodinidae 

 Rotifer vulgaris 

 Philodina 



Both of these species were found in the jar 

 of water mentioned. 

 Phylum Bryozoa 



No bryozoans were found during the survey. 



