FOSSIL SPONGKS. Spoiig. 22 
Dercitites huldonensis, Carter, (17) p. 391, pi. xx. figs. 41 & 47, Chalk flint, 
Norfolk. The affinity with Dercitus is doubtful. 
Geodites cretaceus, Sollas, sp. n., (17) p. 391, pi. xx. fig. 34, Chalk flint, 
Norfolk, and Greensand, Haldon, Exeter. 
Geodia, &c., spicules from flint, (15) pp. 27, 35-38, pi. i. figs. 1-3, 20, 21, 
25-27, pi. ii. figs. 17-19. Geodia, ? spp., spicules, 1. c. pp. 34-36, pis. ii. 
& iii. figs. Geodia ? clavata, Hiude, ibid. p. 29, pi. i. fig. 4, pi. ii. figs. 1-5, 
G. ? coronata, id. ibid. p. 31, pi. ii. figs. 6-8, G. ? wrigldi, iJ, ibid. p. 31, 
pi. ii. fig. 12, spp. nn., all from flint from Upper Chalk, Norfolk. 
Caminus, ? sp., spicules from flint, (15) p. 48, pi. iii. fig. 26. 
Stelletta ? spp., spicules from flint, (15) pp. 33-40, pi. i. figs. 23, 24 & 
28, pi. ii. figs. 9-11 a. 
Pacliyastrella, spicules from flint, (15) p. 45, pi. iii. figs. 24 & 25. 
Pachyastrella primmva, Zittel P, 1. c. p. 46, pi. iii. figs. 28, 32-34. 
Pachyastrella ? sp., p. 48, pi. iii. fig. 27. 
Pachyas^trella carteri, Hiude, sp. n., (15) p. 46, pi. iii. figs. 29-31, flint 
from Upper Chalk, Norfolk. 
Tisiphonia, ?, spicules from flint, (15) p. 43, pi. iii. figs. 16-23. 
Lyidium ziiteli, Hinde, sp. n., (15) p. 51, pi. iv. figs. 1-9. L. cretacea\^cum\, 
id. ibid. p. 54, pi. iv. figs. 10-13, flint from Upper Chalk, Norfolk. 
Carterclla.B^., spicules from flint, (15) pi. iv. figs. 14-23. 
Plinihosella squamosa, flint, (15) pi. iv. figs. 35-46. 
Rayadinia annulata, Hinde, sp. n., (15) p. 58, pi. iv. figs. 24-30, pi. v. 
figs. 1-4, flint from Upper Chalk, Norfolk. 
Rliacodiscula, &c., spicules from flint, (15) p. 60, pi. iv. figs. 31-34. 
The following Lithistiidoi are described and figured by Sollas, (17) 
pp. 386-393, pi. xix., from spicules found in the Trimmingham Chalk 
flints, Norfolk : — 
I. Tetracladina. — Discodermites cretaceus, g. & sp. nn., near Disco- 
dermia. Rhagadinia zUteli, sp. n. Eurydiscites irregularis, g. & sp. nn. ; 
the arms of dermal spicules unite to form an irregularly Icbate disc. 
Manodiscites parvus, g. & uu.x dermal spicule dwarfed. Compsaspis 
cretacea, g. & sp. nn. ; near Kali \^Calli-~\ aspis cidaris. 
II. Megamokina. — Podaspis cretacea and P.parva, g. &spp. uu. ; near 
Lyidium torquilla, ends of skeleton spicule-rays foot-shaped. 
HI. IliiizoMORJNA. — Corallistes cretaceus, sp. n. Macandrewites vicaryi, 
g. & sp. nn., like Macandrewia. Corallistites, g. u. ?. 
Leptophragma, Craticularia, Cystispongia, Coscinopora, Ventriculites, 
spp., (15) pp. 65-69, pi. V. figs., spicules from flint. 
Stauractinella cretacea, Hinde, (15) p. 70, pi. v. figs. 9-11, flint from 
Upper Chalk, Norfolk. 
IJyalostelia fusiformis, Hinde, (15) p. 71, pi. v. figs. 12-16, flint from 
Upper Chalk, Norfolk. 
Protospongia, Salter, is based on a Lyssacine Hexactinellid, according 
to W. J. Sollas, J. G. Soc. xxxvi. p. 362, figs. 1 & 2. 
Hexactinellid, Lithistid, and probably either Pachyastrellid or Pachy- 
tragid sponges represented by spicules in Carboniferous strata, Ben 
