Forty or fifty specimens of an interesting and apparently nndescribed Isopod were obtained from an old well in Irvington, Marion County, Indiana. They were evidently strictly aquatic. The pump in the well drew water from the bottom, and the animals could be obtained only by vigorous work. After capture they lived for some hours in a jar of water, crawling about on the bottom, very much after the manner of Asellus. While in the water the pleopods could be seen to be gently moved up and down with

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... a fanlike motion. Several of the females carried eggs, six or eight of which were sufficient to till the brood pouch.