120 
BRITISH PALASOZOIC SPONGES. 
to me sufficient to justify placing them with Sponges notwithstanding the abnormal 
character of the spicules and their peculiar arrangement in the skeleton. 
Ischadites makes its first appearance in Ordovician strata (Llandeilo), and 
continues through the Silurian, but has not been recognised above this horizon. 
It occurs in Wales and the West of England, Scotland, Norway, Isle of Gothland, 
Sweden, Baltic Provinces of Russia, and in the United States and Canada. 
7. Iscnapires Kania, Murchison. Plate I, figs. 1, 1 a, 1 b. 
1839. 
1837. 
1842. 
1875. 
Iscuapirrs Kanteu, Murchison. Silurian System, p. 697, pl. xxvi, 
nied, TIL. 
PoLyPARIUM = — Hisinger. Lethsea Suecica, p. 115, pl. xxxvi, Supple- 
ment, fig. 2. 
Recepracunires Bronnut, Hichwald. Urwelt Russlands, Heft 2, p. 80, 
pl. i, fig. 9. 
SELENOIDES IlowENsIs, D. Dale Owen. Geol. Surv. Wisconsin, &c., p. 587, 
pl. 18, fig. 13. 
REcEPTACULITES Neprunt, Morris. Cat. Brit. Foss., 2nd edit., p. 363. 
a= Ercuwanpi, Schmidt. Die Silur. Formation von Ehstland, 
&e., p. 282. 
— Browntir, Hichwald. ethea rossica, vol. i, p. 429, pl. xxvii, 
figs. 2a, b. 
Iscnapires Ercnwanpt, Hichwald. Lethea rossica, vol. i, p. 486, pl. xxvii, 
figs. 3 a, b,c. 
Receptacurires Jones, Billings. Pal. Foss. Canada, vol. i, p. 385, fig. 
363 ; p. 389, fig. 365. 
— IOWENSIS, Billings. Ibid., p. 385, fig. 364. 
IsCHADITES aANTIQUUS, Salter. Mem. Geol. Surv. Gt. Brit., vol. iii, p- 282, 
fig. 4. 
— TESSELLATUS, Salter, MS. (See Siluria, 4th ed., p. 509.) 
RECEPTACULITES GLOBULARIS, Meek and Worthen. Geol. Surv. Illinois, 
vol. ili, p. 301, pl. ii, 
figs. 2a, b. 
_ sp. — — Tbid., p. 301, pl. ii, 
figs. La, b. 
Iscuaprres Kenteu, Salter. Cat. Cambrian and Silur. Foss. Cambridge, 
p. LOO. 
RecertacuLites OnroEnsis, Hall and Whitfield. Geol. Surv. Ohio, Pal., 
vol. ii, p. 128, pl. vi, 
fig. 1. 
_ suBTURBINATUS, Hall. Twenty-Seventh Annual Report 
State Museum, Albany, pl. iii, 
figs. 1, 2, 3. 
