﻿122 BRITISH PALEOZOIC PHYLLOCARIDA. 



From the black, graptolitic, finely micaceous shale of Dobbs Linn. Coll. 

 D. J. Brown. 



3. Discinocaris undulata, sp. nov. Plate XVI, figs. 24 a, 24 b. 



This is a large subcircular or subquadrate test (imperfect). As the edge of 

 the more perfect side is flatter than in D. Browniana, and the anterior edge is 

 nearly straight, being only slightly curved outwards, the shape is almost sub- 

 quadrate. The nuchal wedge is clearly evident. The concentric markings 

 consist of broad undulating bands (about seven on a side), with mere traces of 

 fine stride here and there parallel among them (not shown in the drawing). 

 Interstitial ornament (fig. 24 b, magnified forty diameters) is present as an obscure 

 reticulation. 



Dr. Lapworth's figure of D. Browniana in the ' Proc. Belfast Nat. Field-Club,' 

 Appendix, 1877, pi. 7, fig. 25 6, is somewhat undulate, but with fewer bands, and 

 our fig. 21, PI. XVI, represents it better. There is also a figure given by the late 

 Mr. James Dairon in the ' Trans. Geol. Soc. Glasgow,' 1883, pi. vii, fig. 32, which 

 has an apparently undulate surface, but the bands are too broad and too few, and 

 there is a median suture, making it an Aptychopsis. 



PI. XVI, figs. 24 a, b. A dull black film on the usual black graptolitic shale. 

 Garpel Burn. Coll. D. J. Brown. 



Measurements: | , 10 (?) mm. ; — , 9 mm.; _\> 7 mm. at 45°; 6 mm. ; 

 I, 6 mm. ; V, 90°. Width 18 mm. to length 16 (?). 



4. DisciNOCArvis gigas, H. Woodward, 1872. Plate XVII, figs. 1, 2, 3, 4 (?), and 5. 



Discinocabis gigas, H. Woodward. Geol. Mag., 1872, p. 564 ; Eeport Brit. 



Assoc., 1872 (1873), p. 323. 



— — T.B. J. and R. W. Geol. Mag., 1884, pp. 349 and 351. 



— — — Report Brit. Assoc., 1884 (1885), 



pp. 75 and 80. 



A subtriangular fragment of a Phyllopodous shell, showing delicate, 

 concentric, parallel lines (fig. 1), was referred in 1872 by Dr. H. Woodward to a 

 Discinocaris, possibly " seven inches in diameter." This was from the Moffat 

 graptolitic shale at Dobbs Linn, Dumfriesshire. It is in the British Museum ; 

 also an oblong fragment with fine parallel lines (fig. 4). Some flattened relics 

 of four body-rings, 45 mm. in transverse width, and varying from 5 to 10 mm. 

 fore and aft at present, from the same beds at Ettrickbrigend, Selkirkshire 

 (fig. 5), are in the same collection. 



