SPONQTIDA. 
7 Spong. 
Guitarra fimbriata^ Carter: Schmidt, (9) p. 85, pi. ix. fig. 7, Gulf of 
Mexico ; Carter’s interpretation of the structure of its characteristic spicule 
criticised. 
MelonancTiora elliptica^ Carter : (9) p. 85, Caribbean Sea. Schmidt 
criticises Carter’s interpretation of the structure and affinities of the 
characteristic molon-likc spicule. IIo states incidentally that the audio- 
rates of the Desmacidince do not grow. 
Suberites claviger, lobatus, paludum, (9) p. 80, pi. ix. fig. 1, from Medi- 
terranean, cited to prove modification of form under change of circum- 
stances. 
Suberites domuncula^ Schmidt, (2) p. 236, Black Sea. 
TetJiya nvrvegica^ Bowerbank, from White Sea, (4) pi. xxxi. figs. 
1-11. Produces numerous buds, which remain for some time attached 
to the parent by long pedicles, which are composed of bundles of long 
spicula, covered with connective tissue, containing stellate spicules. Buds 
of the second and third order may occur, by the gemmation of a bud 
while still attached. Such colonies are, however, remarkable for their 
want of symmetry. The bud commences as a cylindrical aggregation of 
connective tissue, sun’ounding a bundle of long spicules. The species, 
which differs little from T. lyncurium^ niay be distinguished from it, 
among other characters, by the constancy with which it produces buds. 
T, lyncuriuin^ 1. c. p. 425, pi. xxxi. figs. 12 & 13. 
Cometella^ Schmidt, (9) p. 79. Runs into new generic forms under the 
influence of change of circumstances. 
Cometella steilata, Schmidt, = Tethya caudata^ Schmidt apud Deszo, 
renamed T. cometes^ by Schmidt, (9) p. 78; Gulf of Mexico, 84-329 fath. 
Cometella pyrula. Carter, cannot be a Cometella \ Vosmaer, (13) 
p. 156. 
Tricliostemma hemisphcericum^ Sars, = Radiella sol, Schmidt, (9) p. 77. 
Radiella probably should be suppressed in favour of Halicnemia. 
Group Ecccelonida, (1) p. 56 ; Samus, Gray, is now to be included in it 
as a boring Sponge ; its characters are given, p. 59, as if a new genus. 
S. anonymus, Gray, common in Melobesian nodules from Gulf of Manaar. 
Cliona, Grant, (2) p. 243. A subgenus, Archceocliona, is formed within 
it, based on C. Hancock, which is considered the fundamental 
form of the Clionidee ; C. nodosa, id. is also referred to it. 
Cliona typica, Nardo, 1. c. p. 246, Black Sea, and a Cliona without 
name, 1. c., from Sukhum Bay. 
Cliona, found by P. M. Duncan in cavities of Carpenteria ; J. R. Micr. 
Soc. iii. p. 381. 
Axos cliftoni. Gray, (1) p. 285, pi. xxvi. figs. 5-7. 
Group Geodina, (1) p. 129. Its different spicules enumerated and 
described, and its composition discussed by Sollas, (12) pp. 241 & 396. 
Geodia, Lamarck, (2) p. 278. A sub-genus, Stellogeodia, formed within 
it \yide infrd~\. 
Geodice, (9) p. 74. Schmidt admits that his genus Ryxitis is identical 
with Geodia, s. str. He considers all described Geodice to be varieties of 
one species. 
Geodia per armata, Bowerbank, (1) p. 131, pi. vi. figs. 32-35, from Gulf 
