CHECKLIST OF CEFHALOCHOBDATES, c^c.—OGILBY. 95 



24. PrasTis : — 



a'. Posterior border of teeth grooved. 



b^. Rostrum long and slender, its width behind the proximal pair about one ninth of its length ; 

 lateral teeth 25 or more, the width of the 1st about one sixth of its distance from 

 the 2nd ; no lower cavidal lobe . . . . . . . . . . 38. zy.iron. 



b". Rostrum short and broad, its width Ijehind the proximal pair about two ninths of its length ; 

 lateral teeth 22 or less, the width of the 1st about two fifths of its distance from the 

 2nd ; lower caudal lobe present but inconspicuous . . . . . . 39. microdon. 



a-. Lateral teeth 21, the posterior border rounded ; no lower caudal lobe .. .. 40. clavata. 



25. Rhamphobatis : — 



A single species frequenting the shores of the warmer parts of the Indian and Western Pacific 

 Oceans ; v. supra. 



26. Rhynchobatus : — • 



a^. Dorsal originating above base of venti-als . . . . . . . . . . 42. djiddensis. 



27. Rhinobatus : — 



«!. Internarial width less than half the narial diameter ; spiracle with two conspicuous folds 



43. armatus. 

 a". Internarial width three tenths more than narial diameter ; spiracle without folds 44. hanksii. 



28. Raja :— 



«i. Lavender-gray or pale brown with groups of small black spots, which are white-edged in the 

 young ; size small . . . . . . . . . . . . 45. polyommata. 



a-. Fulvous brown, uniform or with obscure lighter spots ; size moderate . . 46. australis. 



29. Urolophus : — 



«i. Width of mouth less than two fifths of preoral length .. .. .. 47. testaceus. 



30. T^NiURA : — 



o^. Skin of back smooth ; fuscous, with sky-blue spots and bands . . . . . . 48. lymma. 



a-. Skin of back spinigerous ; brown, without spots or bands . . . . . . . . 49. mortoni. 



31. Hypolophus : — 



A single species inhabiting the warmer parts of the Indian and Western Pacific Oceans; 

 V. supra, p. 87. 



32. Dasybattjs : — 



«i. Disk two thirds of tail ; buccal papilla? two ; pale brown or yellow, blue-spotted .. 51. kuhlii. 

 a'-. Disk four ninths of tail ; buccal papillae seven ; vmiform olive-brown . . 52. fluviorum. 



33. Himantura : — 



a}. Tail at least thrice the length of the body ; buccal papilla? four or more ; uniform sandy brown 



53. uarnak. 



34. Urogymnxjs : — • 



A single species, inhabitating the warmer parts of the Indian and Western Pacific Oceans ; 

 V. supra, p. 88. 



35. Pteroplatea : — 



a^. Tail three eighths of tlie length of the disk, annulated brown and yellow, or white blotched with 

 black . . . . . . . . . . . . . . . . 55. australis. 



36. Myliobatis : — 



«i. Lower jaw with njjie series of ventral plates, the width of the first three sevenths of that of last ; 

 base of dorsal more than half its distance from ventral base . . 56. hamlyni. 



37. Aetobatus : — 



a^. Snout broadly rovmded ; back white-spotted . . . . . . . . . . 57. narinari. 



38. Rhinoptera : — - 



a^. Disk more than twice as wide as long ; upper median tooth two thirds wider than adjacent 

 tooth . . . . . . .'. . . . . . . . . . . 58. neglecta. 



39. Mobui.a : — 



a^. No caudal spine ; disk two thirds of length of tail . . . . . . . . ercgoodoo. 



Note : — In the British Museum Catalogue of Fishes (viii, p. 486) Dr. Glinther records a specimen 

 of Callorhynchus antnrcticus from Cape LTpstart. The only cape of that name is on the coast of 

 Queensland uear Bowen, and as it is very certain that no callorhynchid was ever caught within 

 hvmdreds of miles of that place, the species must be expunged from oxir list. 



