The Leyden Museum has possessed for some years in its bird-gallery a specimen of a Rail which was determined by the late Professor Schlegel to be the young of Rallus maculatus. The individual in question purchased of Mr. Frank in 1865. During his recent visit to our Museum, my friend Dr. Bowdler Sharpe pointed out that instead of being a Rail, it was a Crake, and belonged to a section of genera which embraced Crecopsis, Castanolimnas and Crex. He very kindly took the specimen to London with him, and compared it for me with all the neighbouring genera, some of which are not represented in our Museum. As it does not agree with any of the known genera, it seems to represent a new genus, which I propose to call.