16 BRITISH PALEOZOIC PHYLLOCARIDA. 



bearing indications of two rows of the bases of prickles on its upper portion, and 

 thus corresponding with fig. 4 ; it is imperfect at the end. The others are pro- 

 bably perfect in length. 



Fig. 8. A similar, but smaller, set of caudal appendages ; all ridged ; only the 

 style retaining its full length. 



Fig. 9. Style and stylets pressed together. The end of the former is still in 

 the matrix. Some indistinct traces of spine-bases are seen on its lower portion, 

 but not represented in the drawing. 



PL X, fig. 8 (British Museum 44342). Benson Knot,^ Kendal. Dark grey 

 sandstone, somewhat micaceous, and slightly calcareous. 



C. LEPTODACTTLUS. — Carapace. — Not known. 



Ultimate Segment. — With longitudinal anastomosing wrinklets. 



Gaiidal Aj^pendages. — Slender, ridged and fluted. 



Head of Telson. — With lattice ornament and anastomosing longitudinal wrinklets. 



Style (telson). — Fluted, and pitted in two rows on the side (as exposed). 



Stylets. — Delicately fluted. 



Length of Fig. 4. Fig. 5. Fig. 7. Fig. 8. Fig. 9. 



Style 65 mm. ■) 65 mm. 50 mm. | 40 mm. 50 mm. ■) 



(imperfect). ' (broken). 3 (imperfect). ) 



Stylet — — 55 mm. — 28 mm. 



A specimen in the Museum of Practical Geology, marked d f| (' Catal. Cambr. 

 and Sil. Fos., M. P. G.,' 1878, p. 118), from Dudley, a thin curved telson (?), 

 delicately striate, is probably G. leptodadylus. 



In Barrande's ' Syst. Sil. Boheme,' vol. i, Supp., pi. 19, figs. 14—16 of 

 G. inoequalis are comparable with G. leptodadylus. 



2. Ceratiocaeis Muechtsoni (Agassiz), 1839. PI. Ill, figs. 4 a, 4 b, 7 ; PI. IV, figs. 

 1 and 3 ; PI. V, fig. 3 ; PL VI, figs. 1 and 2. 



1839. Onchits Muechisoni, Agassiz. In Silur. Syst., p. 607, pi. 4, fig. 10 (not 



figs. 9 and 11) ; and OncJius, fig. 63 P, 

 and Ichthyodorulite, fig. 64. 

 1851. Leptocheles (MrECHisoNi), Jf'Coy. Synops.Brit. Pal.Foss.jFasc. 1, p. 176. 

 1853. — McEOHisoNi, — Quart. Journ. Geol. Soc, vol. is, 



p. 13 (omitting allusion to figs. 9 

 and 11, Sil. Syst.). 

 1853. DiTiiYEOCARis — Oeinite. Verstein. Grauwackenformation in 



Sacheen, Heft ii, p. 24, pi. 19, fig. 13. 



'^ " The micaceous flags of Benson Knot belong to what are locally called ' Kirkby-Moor Flags ' 

 — i. e. Upper Ludlow."— Prof. T. M'K. Hughes, ' Geol. Mag.,' vol. iii, p. 208. 



