Palaeozoic B waived Entomostraca. 187 



agrees as to the branching and anastomosing of the concentric 

 costulas. 



Fig. 10. Small, oblong, hollow, cast, with ridge reaching all across, 

 owing to unequal pressure. Furrow-casts broad ; internal lines 

 here and there showing indications of bases of spines. On 

 reddish schist, with many modified casts. Referred to " C. 

 tceniata" and somewhat corresponding with 'Zeitschr.' 1869, 

 pi. xxi. fig. 1, but unlike our fig. 7, which is referred to the 

 same. 



Figs. 11, 12. Hollow casts, with ridges and knobs faint; furrow-casts 

 broad ; costulse thin and slightly irregular. In dark purplish- 

 red schist, with similar casts, variously modified as to shape by 

 pressure, aud with numerous inner and outer moulds of annu- 

 lated Tentaculites. Fig. 11 shows a specimen somewhat 

 shortened by pressure. These are referred to " C. serrato- 

 striata" but apparently belong to the more oblong form, with 

 coarser furrows, which more nearly corresponds with Entomis 

 gyrata (Richter). 



Figs. 13, 14. Small, almond-shaped, hollow casts, much like fig. 5, and 

 on the same hand-specimen. Referred to " C. scrobiculata" 

 but probably belonging to E. serratostriata. 



Fig. 15. Outline of a small smooth cast of a shortened valve ; others of 

 a larger size occur on the same slab, which bears also the spe- 

 cimens figs. 5, 13, 14, 16. Referred to " C. scrobiculata" but 

 probably belonging to E. serratostriata. 



Fig. 10. Small, convex, smooth, subglobular cast, of a squeezed-up and 

 shortened valve, with central pit and furrow, exaggerated by 

 terminal pressure. On the same piece of red schist as that 

 yielding figs. 5, 13, 14, 15. Referred to " C. scrobiculata ;" 

 probably E. serratostriata. 



Fig. 17. Outline of a broken hollow cast of the dorsal edge of two united 

 valves, with a slightly raised seam along the junction of the 

 valves, and a very faint cross ridge. In reddish-grey schist, 

 weathering brown, with Tentaculites, and numerous casts, both 

 raised and hollow, of E. serratostriata. The specimen is marked 

 " Ventralseite von C. tenella ;" but it is the dorsal, and not the 

 ventral, edge of the closed carapace of the common Entomis. 



Fig. 18. Shallow hollow cast, with remains of the test; furrow-casts and 

 lines quite smooth and sharp. In dark schist, with scattered 

 portions of other similar copper-red tests, or their replacement 

 by mineral matter (iron oxide ?). Marked " C. costata," but 

 differing considerably from pi. xx. fig. 15, ' Zeitschr.' 1869. It 

 is not very distinct from our figs. 4, 8, 10, 11, 12, except that 

 the costulae are smoother and make two folds near one end of 

 the valve, a pattern obscurely traceable in fig. 4. 



Conclusion. We may conclude, as far as the present evi- 

 dence permits, that figs. 1, 3, 5, 7, 13, 14, 15, 16, and 17 

 belong to Entomis serratostriata (Sandberger), figs. 2 and 

 6 to E. tenella (Richter), fig. 9 to E. labyrinthica (Richter), 

 figs. 4, 8, 10, 11, 12, and 18 to E. gyrata (Richter). 



