On Raia undulata, Lacep, 403 



Ctenocharax bogotensis, sp. n. 



Depth of body 2^ in the length, length of head 3?. Snout 

 as long as eye, the diameter of wliich is 4^ in the length of 

 Jiead and 1^ in tlie interorbital width. Cleft of mouth 

 oblique, the maxillary extending to below the anterior \ of 

 eye. 33 scales in a longitudinal series ; lateral line on 5 or 

 6 scales only. Dorsal 11, origin equidistant from eye and 

 base of caudal. Anal 14, origin below the last ray of the 

 dorsal ; longest rays ^ the length of head ; free edge 

 straight. Pectoral ^ the length of head, not reaching the 

 ventrals. Caudal notched, with rounded lobes. Coloration 

 uniformly olivaceous (in spirit). 



Ilab. Bogota. 



A single specimen, 63 mm. in total length, purchased in 

 1868. 



LIII. — Note on E-aia undulata, Lacep. 

 By (;. Tate Regan, M.A. 



In the British Museum is a specimen of Raia undulata, 

 Lacep., from the coast of Cornwall, presented by the late 

 Mr. Harcourt Powell in 1880. As this species is not usually 

 regarded as belonging to the British fauna, 1 have tried to 

 tind further evidence of its occurrence on the ('Ornish coast, 

 which is furnished by CJouch, who, as has been pointed out 

 by Moreau, certainly had an cxanii)le of Eaia undulata, which 

 he regarded as a variety of R. microcellata, Montagu. 



Raia undulata is described in detail by Moreau (Poiss. de 

 France, i. p. 434, 1881), who states that it is found on all 

 the coasts of France (Mediterranean, Atlantic, and Channel). 

 It is not a little curious that the original describer, Lacepbde 

 (Hist. Nat. Poiss. iv. p. 675, 1802), wrote that it occurred 

 " entre les rivages si frequentes de la France et de 

 TAngleterre." 



Of other British species Raia clavata, L., appears to be 

 nearest to R. undulata, but the latter should generally be 

 easily recognized by its system of coloration, which has been 

 thus described by Couch (b'ish. Brit. Islands, i. p. 108, 1802) : 

 " Another example dilfered considerably from the former 

 [i. e. Raia micvocelhUa'] in the nature and distribution of its 

 colours, which wore still more beauiifid. The ground-colour 

 was a brilliant yellow, marked with numerous gyrations, 

 which were lyre-shaped, each gyration being formed of a 



