In a clear, rocky stream,[B] shallow in most places, flowing between high hills, about four miles northwest of Springfield, crayfish were found in abundance. The smaller and by far the more numerous species was _C. neglectus_. The animals were very active, darting from stone to stone when disturbed, but usually remaining under cover but a short time. In a stream flowing from Galloway Cave, at Galloway, Greene county, _C. neglectus_ and _C. rusticus_ were taken. At the mouth of the cave, _C. neglectus_ was by far the more abundant, if not the only species, being found in great abundance under loose stones at the very mouth. The water here has practically the same temperature as that on the inside. The temperature on the inside of the cave is said to remain at fifty-seven degrees F. winter and summer. The animals were very inactive, the cold water, apparently, numbing them to such an extent that it was not at all difficult to take them with the hand.[C] A little distance down the stream, where the water was much warmer, the animals were noticed to be as active as ever. A striking effect of the low temperature was noticed in the effect on the hatching of the eggs. Many of the females taken at the mouth of the cave carried eggs or recently hatched young, while none of those taken in the other localities were found with young at all. I believe I found young crayfish which had but recently left the female in the vegetation near Boiling Springs, in the James river. In the table following, the distribution by river systems of the different species is given. For convenience, the rivers of the state from which material has been reported have been arranged as follows: MISSOURI RIVER KANSAS RIVER BIG BLUE RIVER REPUBLICAN RIVER SOLOMON RIVER SALINE RIVER SMOKY HILL RIVER OSAGE RIVER ARKANSAS RIVER MEDICINE LODGE RIVER CHIKASKIA RIVER LITTLE ARKANSAS RIVER The tributaries of any stream are arranged in order, beginning with the lower and passing towards the upper portion of the stream. Those tributaries emptying outside the state are designated by an asterisk. When it is impossible to determine from which of two or more streams a lot of material is reported, as is often the case when the localities given is a country traversed or drained by two rivers, or a town situated on some large stream, or where two streams join, it is reported from each, with the catalogue number followed by a question mark. Of course, in the greater number of these cases, the species will be found to occur in greater or less numbers in each locality. The one thing to be desired is, that collectors would furnish full data with their material.