42 DEVONIAN FAUNA. 



Goldfuss this species differs in the extreme narrowness of its furrows. Bronteus 

 minor, F. A. Rom., 1 B. Bischofi, F. A. Rom., 2 MS., and B. Romeri, Kays., 8 differ 

 from this and all the other English species in having the central rib of the 

 tail bifurcated ; and the great majority of the Bohemian species are to be distin- 

 guished from the various Devonshire forms either by possessing this bifurcation 

 or by having the glabella entirely striated. 



In B. planus, Corda, 4 and B. spinifer, Barr., 5 the glabella does not reach the 

 front border. B. Edwardsii, 6 the tail of which has an undivided central rib, comes 

 very near to this species and to B. delicatus; but the granules of the head are more 

 numerous and smaller, and the glabella has more the shape of a door-handle, and 

 the depressions on it are differently arranged. Its tail also, which comes between 

 that of B. granulatus and B. alutaceus, has a more distinctly trilobed axis than in 

 either of these species. 



B. granulatus is distinguished from B. pardalios by the smaller tubercles of 

 the head and the more arched glabella, and by the wider furrows of the tail ; from 

 B. delicatus by the more numerous and distinct tubercles of the glabella, the 

 more triangular axis, and more numerous and distinct tubercles on the ribs of the 

 tail ; and from B. tigrinus by the length of the head being decidedly greater than 

 the width of the glabella. 



Order.— PHYLLOCARIDA, Packard, 1879. 



1. Genus. — Aristozoe, Barrande, 1872. Bactropus, Barrande, 1872. 



The genus Aristozoe was formed by Barrande for some large sub-oblong 

 Crustacean carapaces, which he regarded as Ostracods, but which Jones and 

 Woodward 7 in 1883 surmised to be Phyllopoda, or as now, with Packard, they 

 term them, Phyllocarida 8 . Another genus, Bactropus, of the same author com- 

 prised tubular fossils differing from the abdominal segments of Geratiocaris in 

 their great length. Evidence has been brought forward by Novak showing that 

 these two fossils belong in all probability to one animal ; and therefore Bactropus 

 will have to be absorbed into Aristozoe. 



1 1850, F. A. Bom., ' Beitr.,' pt. 1, p. 19, pi. iii, fig. 32 ; not 1866, ibid., pt. 5, p. 9, pi. xxxiv, fig. 8. 



2 1858, Giebel, ' Sil. Faun. Unterharz.,' p. 14, pi. ii, fig. 2. 



3 1878, Kayser, 'Abhand. Geol. Specialk. Preuss.,' Band 2, pt. 4, p. 44, pi. v, fig. 13. 



4 1852, Barrande., * Syst. Sil. Boheme.,' vol. i, p. 863, pl.xlii, figs. 34,35,and pi. xlviii, figs.l— 8, Et. E. 



5 Ibid., p. 878, pi. xlii, figs. 36—40, Et. G-. 6 Ibid., p. 882, pi. xlii, figs. 30—33, Et. E. 



7 1883, Jones and Woodward, * Geol. Mag.,' dec. 2, vol. x, p. 463 ; and ' Beport Brit. Assoc.,' 

 1884, p. 217. 



8 1885, Jones and Woodward, ' Geol. Mag.,' dec. 3, vol. ii, pp. 349 and 351 ; and ' Report Brit. 

 Assoc.,' 1886, pp. 330—334. 



