SUPPLEMENT, PLATE XXXV. 
carboniferous. 
Fig. 
1, 2. Productas semireticulatus, Martin. Showing attached spines, five inches in length. 
Prom Lower Carboniferous Limestone, West 
Broadstone, Beith, Ayrshire. Mr. Young's Collec- 
tion. Hunterian Museum, Glasgow. (P. 307.) ■ 
3. 8cahricultis,^\.w^\^m. Crushed specimen, showing thread-like spines, 
of which some measure fully one inch and a half. 
Lower Carboniferous Limestone, Trearne, Beith, 
Ayrshire. Same locality as 1 and 2. (P. 308.) 
4—13. compledens, R. Etheridge, jun. Figures after those published by 
Mr. R. Etheridge, jun. (' Quarterly Journal 
Geol. Soc.,' vol. xxxii, pi. xxiv, and pi. xxv). Eig. 
4). Plinge-line and portions of both dorsal and 
ventral valves united with one of the hinge-spines 
in position. 5. Exterior of the dorsal valve, with 
the cardinal process, concentric wrinkles, and traces 
of the reticulate exterior assumed by the latter. 
6. Exterior of dorsal valve, showing the cardinal 
process and concentric wrinkles. 7. Exterior of a 
ventral valve adhering by two and a half spines 
to the end of a segment of an encrinite stem ; 
broken spines are shown round the margins of 
valves. 8. Interior of ventral valve, showing the 
margins gradually enclosed by the substance of the 
encrinite stem. 9. Portion of encrinite stem, 
side view, with adherent productus ; three spines 
shown. 10. Spines tightly clasping encrinite 
stem. 11. A large specimen adhering by seven 
stems. 12. Three individuals, clustered ; front 
view, ventral valves. 13. A larger and more mature 
specimen, front view. Shale and Limestone (= 
Hosie Limestone) of the Lower Carboniferous 
Limestone of the Midlothian Series, Skateraw 
Harbour, near Dunbar ; East Barns Quarry, near 
Dunbar; and Carlops, Peeblesliire. Museum, 
Edinburgh. (P. 303.) 
