92 
Mr. George J. Hinde’s Description of some 
EXPLANATION OF PLATE I. 
The figures are of natural size, except where otherwise indicated. 
Fig. 1. Porosphera globularis, Phillips, sp. Large oval specimen, 
1 oF 2 Pe 
8. 
with tubular perforation. Zone of Micraster cor-an- 
guinum; South Croydon, Surrey. Collection of G. J. 
Hinde. 
Ditto; showing overlapping layers of growth. Zone of Mar- 
supites; Margate, Kent. Collection of Dr. A. W. Rowe, 
F.G.8. 
Ditto; loaf-shaped. Zone of Belemnitella mucronata; Bal- 
lard Cliff, Dorset coast. Collection of Dr. Rowe. 
Ditto; cushion-shaped specimen. Zone of Bel. mucronata; 
Ballard Cliff. Collection of Dr. Rowe. 
Ditto; of average size. Zone of Actinocamax quadratus ; 
Cliff, east of Brighton. Collection of G. J. Hinde. 
Ditto ; median section, showing the arrangement of the radial 
canals. Upper Chalk. Collection of G. J. Hinde. 
Ditto; completely enveloped with a spicular dermal layer. 
Zone of B. mucronata; Ballard Cliff. Collection of 
Dr. Rowe. : 
Ditto; partially covered with an uneven dermal layer. Same 
zone and locality as the preceding. Collection of Dr. 
Rowe. 
9,10. Ditto; loaf-shaped specimens, showing faint indications of 
11. 
12. 
13. 
14, 
15. 
surface grooves. Zone of Marsupites (Uintacrinus 
Band); Thanet coast. Collection of Dr. Rowe. 
Porosphera nuciformis, v. Hagenow, sp. Viewed from above, 
showing the convergence of the grooves at the summit, 
Zone of Marsupites (Uintacrinus Band); Margate. 
Collection of Dr. Rowe. 
Ditto; side view. Zone of A. quadratus; near Newhaven. 
Collection of Dr. Rowe. 
Ditto; showing closely-arranged grooves, Zone of A. quad- 
rvatus; Winchester. Collection of Dr. Rowe. 
Ditto; with prominent apex. Zone of A. quadratus; Sussex 
coast. Collection of Dr. Rowe. 
Ditto; with fragments of the dermallayer. Zone of A. quad- 
ratus; near Newhaven. Collection of Dr. Rowe. 
16, 16a, Ditto; viewed from above and in profile. Zone of Mar- 
17. 
18. 
19. 
supites (Uintacrinus Band); Thanet coast, Kent. Col- 
lection of Dr. Rowe. 
Ditto; viewed from above. Same zone and locality as the 
preceding. Collection of Dr. Rowe. 
Ditto ; with surface grooves and ridges radiating from several 
centres. x 2 diam. From same zone as the preceding ; 
Sussex coast. Collection of Dr. Rowe. 
Porosphera Woodwardi, Carter, sp. Showing the branching ~ 
surface canals. x 2 diam. Zone of Holaster sub- — 
globosus; Dover. Collection of Dr. Rowe. 
