With five Plates and one Map.) rT"^HE collections on which the following notes are based are ._!_ two in number. The first of these is a very extensive one from the Ceylon pearl banks and neighbouring waters.This collection was made by Mr. T. Southwell during the years 1906-09, when he was Scientific Adviser to the Ceylon Pearl Fishery Syndicate, and comprises 326 samples ; at the time when the Syndicate ceased its operations, this collection was handed over to Dr. J. Pearson, the Director of the Colombo Museum, and I have to thank him for entrusting it to me for examination. The second collection was made by Mr. S. W, Kemp, of the Indian Museum, during the month of February, 1913, at Paumben and Kilakarai on the south coast of India. The collections proved to be exceedingly rich, containing in all 87 species and varieties, of which five are noAv to science, namely, Acrocalanus similis, Scolecithricella pearsoni, Centropages trispinosus, Acartia southwelli, Acartiella kempi, gen, nov.
During the course of the John Murray Expedition some 22,000 miles of the floor of the Arabian Sea and the neighbouring areas of the Indian Ocean were mapped by means of the Echosounding apparatus. The region between India and Africa was crossed four times, namely:(i) from Aden to Karachi,(ii) from Bombay to Mombasa,(iii) from Zanzibar to Colombo, and(iv) from Colombo to Aden,while more detailed surveys were carried out in the Gulf of Aden, the Gulf of Oman, and the region off Zanzibar.
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