THE VOYAGE OF H.M.S. CHALLENGER. 
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Family III. Pleromidse, . . . . . . . 312 
Pleroma, n. gen., ....... 312-315 
Demus II. Rhabdosa, . . . . . . . . 315 
Family II. Scleritodermidse, ....... 315 
Scleritoderma, O. Schmidt, ...... 315-317 
Family III. Cladopeltidae, . . . . . . . 317 
Si'plionidium (O. Schmidt), . . . . . . 317-319 
Suborder II. Anoplia, . . . . . . . . 319 
Family I. Azoricidm, . . . . . . . . 319 
Azorica, Carter, ........ 319-324 
Tretolo'pTius, n. gen., ....... 325-354 
Supplementary Account of Lithistida not in the Challenger Collection, . . 326-354 
Family I. Tetracladidse, ....... 326 
Theonella (Gray), ....... 326 
Discodermia (Bocage), . . . . . . . 327-331 
Bacodiscula (Zittel), . . . . . . . 331-333 
Kaliapsis, Bowerbank, ....... 333-334 
Neosiphonia, n. gen., ....... 334 
Rimella, O. Schmidt, . . . . . . . 335 
Collinella, O. Schmidt, . . . . ^ . . . 336 
Sulcastrella, 0. Schmidt, ...... 337 
Family II. Corallistidm, ....... 338 
Corallistes, O. Schmidt, ....... 338-340 
Macandrewia (Gray), ....... 340-342 
Deedalopelta, n. gen., ....... 342-343 
Heterophymia, Pomel, . . . . . . . 343 
Family III. Pleromidse, ....... 343 
Lyidium (?), O. Schmidt, ...... 343-344 
Family I. Neopeltidse, ........ 344 
Neopelta, O. Schmidt, ....... 344-346 
Family II. Scleritodermidse, ....... 346 
Scleritoderma, O. Schmidt, ...... 346-347 
Aciculites, O. Schmidt, ....... 347-348 
Family III. Cladopeltidse, . . . . . . . 348 
Siphonidium, O. Schmidt, . .... 348-349 
Family I. Azoricidse, ........ 349 
Azorica, Carter, . . . . . . . . 349 
Oastrophanella, O. Schmidt, ...... 349-350 
Setidium, O. Schmidt, ....... 350 
Poritella, O. Schmidt, . . . . . . . 351 
AmpMhleptula, O. Schmidt, ...... 351-352 
TremauUdium, O. Schmidt, ...... 352 
Leiodermatium, O. Schmidt, ...... 352-353 
Sympyla, n. gen., ....... 353 
Family II. Anomocladidse, Zittel, . . ' . . . . 354 
Vetulina stalactites, O. Schmidt, . . . . . 354 
IV. GEOGRAPHICAL AND BATHYMETRICAL DISTRIBUTION, . . . 355-405 
V. APPENDIX I., 407-410 
Omissa, .......... 407 
