462 Mr. C. T. Regan on the Fishes of Mr. Miller, in speaking of M. corneri, says : — " The characters by which the fossil is distinguished from M. sandayensls are less apparent than those separating the two living Orkney species " ; but if the analysis of the characters of the group given above be correct, it is precisely with 31. sandayensis that our fossil has least to do. LVI. — The Fishes of the San Juan River, Colombia . By C. Tate Regan, M..A. (Published by permission of the Trustees of the British Museum.) Dr. H. G. F. Spurrell has recently made an excellent collection of fishes in the Condoto, a tributary of the San Juan, a river of the Pacific slope in S.W. Colombia, and has presented them to the British Museum. Three years ago a series of fishes from the San Juan and its tributaries, collected by Mr. G. Palmer, was acquired by the Museum. These collections are rich in novelties, and, except for a few species recently described by Kigenmann (Indiana Univ. Studies, 1912, no. 8), our knowledge of the fish-fauna of this river-system is based on them. Characida?. 1. Lebiasina multimaculata, Bouleng. R. Condoto [Palmer, Spurrell). 2. Piabucina aureoguttala, Fowler. R. Lisa and R. Tamana [Palmer)* 3. Brycon striatulus, &ner. R. San Juan [Palmer). 4. Brycon oligolepis, sp. n. Depth of body 3 to 3^ in the length, length of head 3? to 4^. Snout nearly as long as or a little longer than diameter of eye, which is 3 to 4.^ in length of head ; interorbital width 2i to 3. Maxillary extending to below anterior part or middle of eye; lower jaw shorter than upper. 13 or 14 gill-rakers on lower part of anterior arch. 44 to 48 scales in lateral line, 8 or 8^ from origin of dorsal to lateral line,
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