CLASSIFICATION. 
Spong. 11 
Suborder in. Oligosilicina. 
Fam. 1. Chondrosidcc. (Genera, Chondrilla, 0. S., Chon- 
dr osia, Nardo.) 
Fam. 2. Haliscircidce. (Genera, Oscarella , Yosmaer, Hali- 
sarca , Dujardin.) 
Suborder iv. Pseudotetraxonia. 
Fam. 1. Tethyidce. (Genera, Tethya , Lmk., Tuherella , 
Keller, Aaptos, Gray.) 
Suborder v. Clavulina. 
Fam. 1. Polymastidce. (Genera, Polymastia , Bwk., Weber- 
ella , Vosm., Tentorium , Vosm., Osculina , O. S., 
Papillella , Yosm.) 
Fam. 2. Suberitidce. (Genera, Quasillina, Norm., Stylo- 
cordyla , W. T., Rhizaxinella , Keller, Suberites, 
Nardo, Poterion, Schlegel.) 
Fam. 3. Clionidce , provisional. (Genera, Cliona , Grant, 
Pione , Gray, Myle , Gray, Sapline , Gray, Idomon , 
Gray, Jaspis , Gray, Pronax, Gray, Thoosa , Han¬ 
cock, Euryphylla , D. & M., ? Samus , Gray.) 
Order III. Cornucuspongi^e. Skeleton consisting either of mon¬ 
axon spicules, 'which are cemented together by more or 
less spongin, or only of spongin, with or without incor¬ 
porated foreign bodies. Inhabitants of salt, brackish, and 
fresh water ; chiefly at no great depths. Carboniferous 
to recent. 
Suborder i. Halichondrina. 
Fam. 1. Halichondridce. (Genera, Halichondria , Fleming, 
Calyx , Yosm., Tedania, Gray, Foliolina , 0. S., 
Petrosia, Yosm., Peniera , O. S., Metschnikoivia , 
Grimm., Eumastia , 0. S., Chalina , Bwk., Auletta, 
O. S., Dictyonclla , 0. S., Sjnnosella, Yosm., Pachy- 
chalina , 0. S., Axinella , O. S., Pseudo chalina, 
O. S., Cacochalina , O. S., Cladochalina , 0. S., 
Sclerochalina, 0. S., Rhizochalina , 0. S., ^4cer^o- 
chalina, Ridley, Acanthella, 0. S., Toxochalina, 
Ridley, Cavochalina, Crtr.) 
Fam. 2. Spongillidce. (Genera, Spongilla,Jjm'k., Ephydatia, 
Lmx., Tubella, Crtr., Formula, Crtr., Hetero- 
meyenia, Potts, Lubomirskia , Dyb., Lessepsia, 
Keller,' Uruguay a, Crtr., Potamolepis, Marshall.) 
Fam. 3. Desmacidonidce. (Genera, Gelliodes, Ridley, J/y- 
0. S., Hastatus , Yosm., Desmacidon, Bwk., 
Crambe , Yosm., Hamigera , Gray, Artemisina ? 
Yosm. ?, Forcepina, Yosm. ?, Hamacantha, Gray, 
Vomerula , O. S., Iotrochota, Ridley, Melonancora , 
Crtr., Guittarra, Crtr., Amphilectus, Yosm., Espe- 
rella, Yosm., Jophon , Gray, Cladorhiza , Sars, 
Chondrocladia , W. T., Sceptrella , 0. S., Sclerillaj 
O. S.) 
