Within the last few years I have examined all the specimens of this sub-family contained in the following institutions: The Royal College of Surgeons, London; The Indian Museum, Calcutta; The Natural History Society, Bombay; The Govern ment Museum, Colombo The Medical College Museum, Madras The Bangalore Museum The City Hall Museum, Hongkong The Shanghai Museum, and lately the entire British Museum collection. In addition I examined in Yokohama a large collection made by Mr. A. Owston in the Seas about Japan and the loo Choo Islands, a second large collection from the same source, a fine collection made by Mr. J. R. Henderson in Madras, and many smaller private collections from various parts as well as many specimens obtained by myself on the coasts of India and Burmah. I have detailed notes Of every specimen examined and propose in the following monograph to review this confused subject, which, I venture to think, requires a thorough revision and this must necessarily entail much allusion to Professor Boulen ger's work.
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