Fig. 20, 20a. 
” 
” 
9 
” 
” 
» 26, 26a. 
9 
” 
21, 21a. 
22, 22a. 
23, 23a. 
24, 24a. 
25. 
27, 27a. 
28, 28a. 
Fossils from a Croydon Garden, 93 
Porosphera pileolus. Thimble-shaped specimen, with 
a fragment of dermal layer on the exterior; the base 
(20a) showing concentric bands of growth. Zone of 
A. quadratus; near Newhaven. Collection of Dr. 
Rowe. 
Ditto. Zone of Marsupites (Uintacrinus Band) ; Thanet 
coast. Collection of Dr. Rowe. 
Porosphera patellfornus, sp.n. Viewed in profile (22) ; 
the deeply concave base (22a) showing concentric lines 
of growth and faint radial lines. Zone of A. quadratus ; 
Sussex coast. Collection of Dr. Rowe. 
Ditto; a conical specimen, viewed in profile (23); the 
base with faint concentric lines of growth (28a). Zone 
of Marsupites (Uintacrinus Band); Thanet coast. 
Collection of Dr. Rowe. 
Ditto; a depressed specimen, viewed in profile (24); the 
base with concentric and radial lines (24a). Same 
zone and locality as the preceding. Collection of Dr. 
Rowe. 
Ditto; viewed from above, showing some fragments of the 
spicular dermal crust. Same zone and locality as the 
preceding. Collection of Dr. Rowe. 
Ditto; a small specimen, viewed in profile, natural size 
(26); and the concave base, with rod-like spicules 
radiating from the centre to the margins, enlarged 
4 diam. (26a). Zone of Terebratulina gracilis; Hast 
Cliff, Dover. Collection of Dr. Rowe. 
Porosphera arrecta, sp.n. Viewed in profile (27), and 
showing the base (27a), enlarged 3 diam. Zone of 
Rhynchonella Cuviert; Branscombe Cliff, South Devon 
coast. Collection of Dr. Rowe. 
Ditto; showing the exterior and the basal aspect, en- 
larged 3diam. Zone of Marsupites (Uintacrinus Band) ; 
Thanet coast. Collection of Dr. Rowe. 
