KEPORT ON THE TETRACTINELLIDA. vii 
PAGE 
Supplementary Account of Epipolasidse not in the Challenger Collection, . 205-209 
Asteropus, n. gen., ....... 205-206 
Coppatias, n. gen., ....... 206-209 
Demus III. Sterrastrosa, ........ 209 
Family I. Geodiidae, ........ 209 
Subfamily Erylina, . . . . . . . . 209 
Erylus, Gray, ........ 209-214 
Caminus, O. Schmidt, ....... 214-218 
Subfamily Geodina, . . . . . . . . 218 
Cydonium (Muller), ....... 218-227 
Synops, Vosmaer, ....... 227-235 
Isops, Sollas, ........ 236-237 
Supplementary Account of Sterrastrosa not in the Challenger Collection, . . 237-274 
Family I. Geodiidae, ........ 237 
Erylus, Gray, ........ 237-241 
Caminus, O. Schmidt, ....... 241-242 
Pacliymatisma (Bowerbank), ...... 242-244 
Geodia (Lamarck), ....... 244-254 
Cydonium, ........ 255-265 
Synops, ......... 265-267 
Isops, ......... 267-271 
Family II. Placospongidae, . . . . . . . 271 
Placospongia, Gray, . . . . . . . 271-273 
Ineertsz sedis — Antares, n. gen., . . . . . , 274 
Suborder III. Microsclebophoea, . . . . . . . 274 
Family III. Thrombidae, . . . . . . . 274 
Thrombus, Sollas, ....... 275-278 
Supplementary Account of Microsclerophora not in the Challenger Collec- 
tion, . . . . . ■ . . . . 278-283 
Family I. Placinida, F. E. Schulze, . . . . . . 278 
Placina, F. E. Schulze, ....... 278-279 
Placortis, F. E. Schulze, . . . . . . 279 
Family II. Corticidae, Vosmaer, . . . . . . 279 
Corticium, 0. Schmidt, ....... 280 
Caleabrina, n. gem, ....... 280 
Corticella, n. gen., ...... 281 
Rhachella, n. gen., . . .... 281 
Family III. Thrombidae, ....... 282 
Thrombus, ........ 282-283 
Order II. Lithistida, ......... 284 
Suborder Hoplophora, ........ 284 
Demus I. Triaenosa, ........ 284 
Family I. Tetracladidae, Zittel, ....... 284 
Theonella (Gray), ....... 284-292 
Discodermia (Bocage), ....... 292-299 
Neosiphonia, n. gen., ....... 299-301 
Family II. Corallistidae, ....... 301 
CoralUstes (O. Schmidt), ...... 301-309 
Callipelta, n. gen., ....... 309-312 
