Reniera, sp. 
(Plate I, figs. 16, 17). 
Spicules of a cylindrical form, curved, uniform in calibre 
throughout and rounded at both ends. Exterior surface ori- 
ginally smooth. Canals obliterated, but in similar spicules 
from the Westphalian Chalk a simple cylindrical canal traver- 
ses the spicule. There are two well marked forms of these 
spicules; the one (fig. 16), longer and proportionally much 
thinner than the other, has a length of 0.517 mm. by 0,056 mm. 
The shorter (fig. 17) form, in some specimens almost kidney 
shaped, is 0,33 mm. long by 0,112 mm. wide. Specimens of 
both forms are not uncommon. 
Spicules of existing sponges, nearly approaching in form 
to these, have been discovered by Mr. Carter in species of Re- 
niera from the Gulf of Manaar; (An. and Mag. Nat. Hist. 
Sh 5h Vely 0), ps-478;. Pl, V, fig: 08)s\.Gylindrical) .spicules 
have also been figured by Oscar Schmidt in a sponge from 
the Atlantic, Swberites arciger (Atlant. Spong. p. 47, Taf. V, 
fig. 6). Cylindrical spicules similar in form but of larger 
size have lately been discovered by Mr. Carter in Irish Carboni- 
ferrous! strata‘ (An) and) MagiS, 5): Vola 6, p) 212, Pl) XIV, 
fig. 14). They are present also in the Chalk Strata of Coes- 
feld. (Ueber Coelop. p. 40, Taf. IV, figs. 38—43) and in the 
Green Sand at Haldon (An. and Mag. Nat. Hist. S. 4, Vol. 7 
Pl. IX, fig. 53). 
Scolioraphis? sp. 
(Plate I, fig. 5). 
Very elongated, sinuous spicules, apparently cylindrical, 
of the same thickness throughout their length, irregularly bent 
and fractured at their extremities. A central canal is exhibited 
in some specimens. The surfaces of these spicules are far 
more eroded than any others in this flint-meal, and forameni- 
feral shells and other small objects frequently adhere to them, 
so that they have an altogether different aspect to any other 
