Localities in which Pellagra is Prevalent. 63 



known when in confinement to eat one another if other food 

 is not available. 



In addition to the crawfishes, several species of small 

 flat crustaceans belonging to the group Isopoda were now 

 and then encountered in the streams. One of the most in- 

 teresting was the blind crustacean { Cecidotea stygia ) taken 

 in October from a spring-fed stream flowing into Straight 

 Creek near Gary. It is a common species throughout East- 

 ern Kentucky. In addition to this Isopod a few specimens 

 of an eyed species of Asellus were obtained under rocks at 

 the edge of Cumberland River. So far as known to me our 

 species of this group are vegetable feeders. 



BRYOZOA OR POLYZO A i MOSS ANIMALS). 



Water mains in cities sometimes become infested with a 

 singular small animal growing associated in groups and 

 forming branching colonies attached to the inner surfaces 

 of the pipes. At times these growths become so numerous 

 as to offer a serious hindrance to the flow of water, and 

 their decay at certain seasons pollutes water supplies so as 

 to be a source of danger to health. One of these branching 

 growths was common in the swiftest water of Cumberland 

 River and Straight Creek. When rocks lying in the water 

 were turned over, extensive and often rather pretty patches 

 were revealed closely attached to the under surfaces, so 

 closely in fact that they were liable to be broken into small 

 fragments by attempts to remove them. At the extremity 

 of each branch is an opening through which an individual 

 may protrude its beautifully tentacled forward extremity. 

 The same species has been repeatedly collected by me in 

 rocky streams at Lexington. The food consists of micro- 

 scopic plants and animals. 



The winter is passed in the egg stage and at this season 

 the singular winter eggs (statoblasts) may be collected from 

 water mains and streams. Animals of this group are much 

 more common in fresh waters of all sorts than is generally 

 supposed. The reason they are not recognized for what 

 they are is because of their plant-like appearance. They 



