598 GEOLOGY OF THE WESTERN COALEIELDS, 



Family BATID^IE. 



271. Trygox graxulata, n. sp. 



Tail without any cutaneous fold, slender, nearly twice the 

 length of the disk and covered to the extremity with very minute 

 spines. Snout very obtusely angled. Disk about as broad as 

 long. Head and back of body covered with small granules which 

 extend on the ridge of the tail to the spine. Two papillcc at the 

 bottom of the mouth. Colour uniform dirty brown. Diameter 

 of disk 1 3 inches. 



272. T.EXIURA LYMXA, CuV. 



Gunth., Cat. 1, p. 483.— MuUer & Henle, pp. 171-197. 



273. TyEXIURA ATRA, 71. Sp. 



Tail nearly twice the length of the disk, with a large cutaneous 

 fold below the terminal half. Disk much broader than long, and 

 rounded at the snout. Head and body above densely covered 

 with small nitid granules, within the centre of the ridge of the 

 back three or four rounded depressed nitid tubercles ; the granules 

 only extend on to the root of tail. The colour is a jet glossy 

 black over all the upper surface, the under surface is white. 

 Diameter of disk 16 inches. 



274. Rhixobatus graxulatus, Cuv. 

 Gunth., Cat. 8, p. 443.— Muller & Henle, p. 117, pi. 38. 



!N'oTEs ox THE Geology or the Westerx' Coalfield, 

 Capertee. Part II. 



By Professor Stephexs, M.A. 

 The Marangaroo beds show some distinct and sure tokens of 

 at least a partially marine oi'igin. Mr. Wilkinson has observed* 



* Geological Map of Hartley, &c., note 17. 



