SPONQIIDA. 
10 Spong, 
discs ; represented by Corallistes polydiscus, Schmidt, in recent time ; 
also in chalk. 
Rhacodiscula sp. n., (23), pi. i. fig. 8, mentioned by Garter, Ann. N. H. 
1876, p. 466, Philippines. 
Geodia stellosa, Czerniavsky (6), p. 397, pi. viii., Black or Caspian Sea. 
Spongilla stagnalis, Dawson (6), p. 3, figs. 3 & 6, Lake of the Woods, 
River St. Lawrence ; S. asperrima, id., S. flexispina, id., p. 4, figs. 2 & 4, 
River St. Lawrence ; S. ottawaensis, id. p. 6, fig. 6. 
Spongilla lieherhuehni, Brotherus, Medd. Soc. Fenn. iii. p. 174. Not 
described ; said to have been described by Lieberkiihn without name. 
Luhomirskia, Dybowsky (7), p. 31. Based on Spongia haicalensis, 
Pallas, of which varieties are indicated ; differs from the Spongillidce in 
absence of gemmules, and by its stellate or dimple-like clusters of oscula, 
by its more marine manner of growth ; spicula bacillar in some cases. L. 
intermedia, hacillifera, papiracea {^papyr-"], with several unnamed varieties, 
Dybowsky, 1. c., Lake Baikal. 
Trachyspongilla, Dybowsky (7), p. 53. Includes the Spongillce with 
spined spicules. T. sibirica, Dybowsky, 1. c., Pachabicha, lake near 
Lake Baikal. 
Technitella, Norman (15), p. 279. Differs from Haliphysema in the 
sponge-spicules being generally enclosed entirely in the body-wall, in its 
being unattached, and in having a tubular mouth -opening. T. legumen, 
Norman, p. 279, pi. xvi. figs. 3 & 4. Poraminiferous sand, 112 fath., west 
of Valentia. T. melo, Norman (/. c.), p. 280, pi. xvi. figs. 6 & 6, from 1215 
fath., sixty miles south of Rockall. 
Marsipella, Norman (15), p. 281. Differs from preceding apparently 
only by the externally projecting, anterior, spicules. M. elongata, 
Norman, 1. c. pi. xvi. fig. 7, Atlantic, west of Orkney, 767 fath. 
[According to the author, these are to be regarded as genera incertm 
sedis, but as nearest to Haliphysema^ 
Aulospongus, Norman (16), p. 266, note. Founded for Haliphysema 
tuhulatum, Bowerbank. Formed of tubuli, devoid of pores or oscula, 
their surface beset with small spicula. 
Hexactinellida. 
Hyalonema toxeres, Thomson (20), i. p. 273, figs. 66-69, Bermudas. 
[See Zool. Rec. 1873.] 
Poliopogon, Thomson (20), i. p. 174. Differs ivom. Hyalonema in being 
laterally compressed, and fan-like in shape, and fringed above. It is 
anchored below by spicula ending in two-hooked grapnels. P. amadou, 
id. 1. c. fig. 38, off Isle of Ferro. [See Zool. Rec. 1873.] 
Euplectella suherea, Thomson (20), i. p. 138, fig. 29, Atlantic, Cape St. 
Vincent, and Brazil. 
Lefroyella, Thomson (20), i. p. 401. Tubular, open at distal end, ex- 
ternally ridged, of anastomosing fibres. L, decora, id. 1. c. fig. 403, off 
Bermudas. 
Oalcarea. 
Teichonella, Carter (2), p. 35. Vallate or foliate, cloacal openings 
confined to edge or one side of the lamina. T. prolifera, ibid. figs. 1-5, 
and T. lahyrinthica, p. 37, figs. 6-9, pi. ii. Fremantle, Australia. In 
