SYSTEMATIC. 
Spong. 11 
Eurete erectum , p. 72 ; 
Claviscopulia intermedia , p. 76; 
Chonelasma tenerum , p. 81; 
Bathyxiphus subtilis, p. 82. 
Schulze, in Arner. Hexact., redescribes : 
Hyalonema toxeres , p. 4; II. kenti , p. 5 ; 
Euplectella suberea, p. 17; 
Regadrella phoenix , p. 20; 
Hertwigia falcifera , p. 22; 
Asconema setabulense, p. 25; 
Sympagella mix , p. 32; 
Staurocalyptus dowlingi, p. 47; 
Rhabdocalyptus dawsoni , p. 54; 
Farrea occa, p. 68; 
Chonelasma calyx , p. 78; 
Aphrocallistes bocagei , p. 85 ; d. vastus , p. 86. 
Schulze, SB. Ges. naturf. Berlin 1899, p. 112, redescribes Hyalonema 
affine and identifies H. apertum and H. maehrenthali with this species. 
HEXACERATINA. 
[Nothing.] 
TETRAXONIA. 
TETRAXONIDA. 
Tetractinellida [cf. Titles 22, 41]. 
Ecionema agglutinans , Thiele, Bibl. Zool. xxiv, ii, p. 7, n. sp. 
Theonella swinhoei and Tetilla australiensis , Thiele, Bibl. Zool. xxiv, ii, 
p. 6, redescribed. 
Notes on synonymy (. Ancorina , Ecionema , Erylus , Isops)> Lindgren, Zool. 
Anz. xxii, p. 87. 
Lithistida. 
[Nothing.] 
MONAXONIDA. 
Clavulina [cf. Titles 1, 3, 19, 41, 43]. 
Johnson, J. Micr. Soc. 1899 establishes the new genera Xisella, p. 463 
and Scantilla , p. 462. 
Melophlus , Thiele, Bibl. Zool. xxiv, ii, p. 8, n. gen. 
Johnson, J. Micr. Soc. 1899, describes the new species: 
Acca insidiosa , p. 461; A. rodens, p. 462; A. infesta , p. 462; 
Xisella verticillata , p. 463 : 
Scantilla spiralis , p. 462; 
Melophlus sarasinorum , Thiele, Bibl. Zool. xxiv, ii, p. 8, n. sp.; 
Thiele, Bibl. Zool. xxiv, ii, redescribes Placospongia melobesioides , p. 9 
and Spirastrella inconstans , p. 10. 
Berg, Comun. Mus. Buenos Aires i, p. 77, replaces the generic name 
Anisoxya Topsent, 1898, previously occupied by Topsentia. 
