1886. ] POSITION AND CLASSIFICATION OF SPONGES. 583 
10. Familia THEenerpas, Sollas. 
With large outlets to the ciliated chambers, and spirastrellid 
spicules. 
Thenea, Gray (Tisiphonia, Wyville Thomson, Dorvillia, Sav. Kent, 
Wyville-Thomsonia, Wright); Normania, Vulcanella, and Chara- 
cella, Sollas. 
11. Familia TetT1Lu1p#, Sollas. 
With flesh-spicules which are hamate, spiral, or rod-shaped. 
Spiretta, Lendenfeld; Tetilla, Schmidt; Craniella, Schmidt ; 
Chrotella, Sollas ; Papirula, Schmidt ; Thalassomora, Lendenfeld. 
12. Familia TETHYOPSILLID&, nov. 
Spherical sponges supported by dense masses of large radial 
monaxonid spicules. A few tetraxonid grapnels are inserted in the 
surface. 
Tethyopsilla, Lendenfeld, and Protoleia, Dendy and Ridley. 
11. Subordo MonaxoniDa. 
11. Group CLavuLina, Vosmaer, emend. 
With monaxonid spicules or without supporting skeleton. 
Supporting spicules tylostyle, usually radially situated. (Includes 
the Pseudotetraxonia, Vosmaer.) 
1. Familia TerHyp®, Vosmaer. 
More or less spherical sponges, with regular subdermal cavities 
between the thick distally extending radial bundles of spicules. 
1. Subfamilia Tethyne, nov. 
With stellate flesh-spicules. 
Tethya, Lamarck; Tuberella, Keller (Tethiophena, Schmidt) ; 
Tethiosphera, Lendenfeld ; Mastigophora, Lendenfeld ; T'halasso- 
dactylus, Lendenfeld. 
2. Subfamilia Tethiopsammine, nov. 
With a sand cortex. 
Tethiopsamma, Lendenfeld, MS. 
3. Subfamilia Tethyorhaphine, nov. 
With rod-shaped flesh-spicules, without stellates. 
Tethyorhaphis, Lendenfeld. 
4. Subfamilia Tethyamatine, nov. 
With hamate flesh-spicules (sigmata) without stellates. 
Tethyamata, Lendenfeld, 
