On Raia niululata, Laccp. -403 



Ctenocliarax hogotensis, sp. n. 



Depth of body 2f in the lengthy length of head 3f . Snout 

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

 liead and 1^ in the 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 

 ventral.^. Caudal notched, with rounded lobes. Coloration 

 uniformly olivaceous (in spirit). 



Hub. Bogota. 



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

 1868. 



LIII. — Note on Raia undulata, Lacep. 

 By V,. Tate Regan, M.A. 



In the British Museum is a specimen of Raia unciulafa, 

 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 

 find further evidence oi its occurrence on the Cornish coast, 

 which is furnished by (*ouch, who, as has been pointed out 

 by Moreau, certainly liad an examj)le of Raia undalata, which 

 he regarded as a variety of B. nucrocellataj Montagu. 



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

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

 the coasts of France (Mediterranean, Atlantic, atid Chainiel). 

 It is not a little curious that the original describer, Lacep^de 

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

 ''entre les rivages si frequentes de la France et de 

 I'Angleterre." 



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 Coucii (Fish. Brit. Islands, i. p. 108, 1862) : 

 " Another example differed considerably from the former 

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

 colours, which were still more beautiful. The ground-colour 

 was a brilliant yellow, marked with numerous gyrations, 

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



