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, 



