190 BRITISH PAL.^.OZOIC PHYLLOCARIDA. 



branch more or less from one another. On the antepenultimate they *' con- 

 verge by running, in a curving course, towards the anterior outer embossed angles 

 of thu segment,^ or join others that do." 



The specimen came from a black limestone of the Coal-measures at Danville, 

 Illinois. Referred to "No. 14" bed of the Coal-measures of Vermilion County, 

 Illinois, in Bradley's ' Geology of Illinois,' vol. iv, pp. 224-7. 



18. DiTHYROOABis CARBONARiA, Meek and Worthen, 1870. Plate XXIX, figs. 5 a, b, 

 and 6. (Copied from M. and W., figs. 1 o and 1 b, op. cit. infra.) 



DiTHTEOCAEis CAEB0NAEIU8, Meek and Worthen, 1870. Proceed. Acad. Nat. Sci. 



Philadelphia, vol. xxii, p. 55. 



— — — 1873. Geol. Siirv. Illinois, vol. 



V (Geol. and Paleont.;, p. ei8, 

 pi. xxxii, figs, la, 15. 



— — C. A. White, 1884. Thirteenth Rep. Dept. Geol. 



Nat. Hist. Indiana, p. 178, pi. xxxix, fig. 2. 



— (CABBONAEiA, fide J. P. Lesley), C. E. Hall, 1876. Proceed. 



Araer. Philos. Soc, vol. xvi, No. 6, p. 56. 



— CAEBONAEiA, S. A. Miller, 1877. Pal. Poss. America, p. 217; and 



lS89, North-Amer. Geol. and Paleont., p. 545. 



— — E., W., and J., 1887. Eep. Brit. Assoc, for 1886 



(1887), p. 63. 



— ~ J. P. Lesley, 1889. Diet. Pops. Pennsylv., p. 212. 



— — A. W. Vogdes, 1893. BiblioRr. PaL-eoz. Crust., 



p. 382. 



Size 



-In fig. 6 (M. and W.'s fig. 1 h, nat. size) ; ventral aspect: 

 Style (including head or caudal plate) 22 ram. long, and 4 mm. wide at 



the top. 

 ■Stylets 22 mm. long when perfect, and 4 mm. wide. 

 Characters. — The proximal parts of a caudal trifid. The spines appear to 

 have been relatively short and thick. The style is bayonet-shaped and smooth ; 

 sectional areas are given with M. and W.'s fig. 1 a for the upper and lower portions. 

 The stylets are coarsely striate on the proximal moiety, with 5 — 7 costulse ; and 

 have only smooth mid-ribs on their distal halves. The style was probably rather 

 shorter than the stylets, but they are all broken at the tips. 



From the Middle Coal-measures at Danville, Illinois; and tlie Coal-measures 

 of Warren County, Pennsylvania. 



' Analogues of these radiate knobs may be seen in the abdominal segments of Ccratiocaris 

 MurcUsoni, fig. 4n', pi. iii, ' Monogr. Brit. Pal. Phyll.,' part i, 1888. 



