Kditokiai-. L'Oo 



Proft'ifivt' Coloration in Conilnxms virilis Hagen. — In Mr. IC. !>. 

 Williamson's paper on "The Crayfish of Allegheny County, Pa.," 

 Annals Carnegie Museum, Vol. I, No. i, p. 8, mention is made 

 of C. virilis Hagen from Ontario, Canada. These crayfish were 

 collected by me in vSandy Lake, a small lake in Peterborough 

 County, between Pigeon and Buckthorn Lakes, in 1894 and 1895. 

 The bottom of the lake is made up entirely of white marl and clay, 

 and, as normally colored crayfish would be very conspicuous, those 

 found in this lake have adapted themselves to their surroundings, and 

 the color varies from almost pure white to pink, or in some cases to a 

 delicate greenish tint. Their color makes them jjractically invisible 

 when at rest, so that they are difficult to capture. The fishermen of 

 the district have found that this protective coloration makes them very 

 conspicuous in other places, so that large numbers of them are gath- 

 ered every year and taken over to the other lakes to be used in bass 

 fishing. 



Local fishermen claim that " the black bass is white in Sandy Lake," 

 and the single specimen which I saw caught was of almost a silvery- 

 white color; entirely different from those of lakes less than three- 

 quarters of a mile away. 



The character of the water may have something to do with the 

 color, as it appears to be very strongly impregnated with lime and 

 other salts. Plants growing in the lake are heavily incrusted and 

 when taken out of the water and dried become so brittle that they 

 break at a touch. 



In contrast to the pale colors of the fish and crayfish 1 may state 

 that the niost richly colored examples of Unio luteolus, var. rosaceus 

 De Kay, which I have ever seen, I collected in this lake. 



Geo. H. Clapp. 



Bipalium kewensc Mos. — This "Land Planarian," described by 

 Prof H. N. Moseley from specimens found in Kew Gardens, imported 

 on plants from some unknown district, has since been found in green- 

 houses in many parts of the world. (See " Notes on Turbellaria," by 

 Prof \V. McM. Woodworth, in Am. Naturalist, Vol. XXX., p. 1046.) 

 It has also been found in the forests of Upolu, Samoa. 



In January, '94, I found a single young example in the Phipps 

 Conservatory, Allegheny, and in the fall of '97 several young and one 



