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Show 1895.] ON FISHES FROM MATTO GROSSO AND PARAGUAY. 523 This Gazelle was said to be known to the Arabs of the Libyan or Western Desert of Egypt as the " Ghazal abiad," or White Gazelle; but was certainly not nearly so common as Gazella dorcas, which occurred in both the Eastern and Western Deserts. Mr. W . Saville Kent, F.Z.S., exhibited a coloured sketch of a species of Nudibranchiate Mollusk, which he had met with in Western Australia, remarkable for its large size and colouring, and probably referable to Doris or an allied genus. A communication was read from Messrs. F. E. Beddard, M.A., F.R.S., and A. C. Haddon, M.A., M.R.I.A., containing descriptions of a number of new species of Nudibranchiate Mollusks, examples of which had been collected by the latter author during his recent stay in the neighbourhood of Torres Straits. This paper will be published entire in the Society's ' Transactions.' Mr. G. A. Boulenger, F.R.S., gave an account of a large collection of Fishes formed by Dr. C. Ternetz at various localities in Matto Grosso and Paraguay. So few Fishes had been collected in the Paraguay system since the time of Natterer, that it seemed desirable that a full list of all the species represented in the present collection should be given. This was accordingly done, the specimens being referred to 97 species, of which the following were described as new :- 1. PLAGIOSCION TERNETZI, sp. n. Outer, upper, and inner lower teeth considerably enlarged. Depth of body 3 times in total length, length of head 3 to 3 | times ; snout a little longer than diameter of eye, which is 5 to b\ times in length of head; interorbital width equal to length of snout, 4 times in length of head ; maxillary extending to below posterior border of eye; praeopercular border rounded, finely denticulated behind, with wide-apart small seme at the angle and below7. 15 gill-rakers on lower part of anterior arch, the longest as long as or a little shorter than longest gill-filaments. Lower pharyngeal teeth villiform. Dorsal X , I 33-35 : third and fourth or fourth and fifth spines longest, \ to f length of head. Pectoral nearly | length of head. Anal II 6 ; second spine very strong, \ length of head. Caudal pointed, densely scaled. The distance between base of anal and base of caudal 2\ depth of caudal peduncle. Scales nearly all ctenoid, 95-100 ^ ^ 5 lat. 1. 48-50. Uniform silvery. Total length 450 millim. Two specimens, from Remanso, Rio Grande, Paraguay. This species is allied to Scicena surinamensis, Blkr. |