The porifera and coelentera . thus, M. Edw. The existenceof an epithecate wall, with which is correlated the absence of a perisarcis sufficient to separate the Flaliellinae from other Turbinolidae, andthe same feature brinies them into relationship with the researches may lead to the inclusion of several forms now classedas Turbinolinae amongst the Flabellinae. Flabellum variabile andFlacotrochus laevis reproduce themselves asexually by a process of strobil-isation, and Blastotrochus nutrix gives rise to lateral deciduous buds(see Semper, 91). Sub-Family 2. Tcrbixolixae. G
The porifera and coelentera . thus, M. Edw. The existenceof an epithecate wall, with which is correlated the absence of a perisarcis sufficient to separate the Flaliellinae from other Turbinolidae, andthe same feature brinies them into relationship with the researches may lead to the inclusion of several forms now classedas Turbinolinae amongst the Flabellinae. Flabellum variabile andFlacotrochus laevis reproduce themselves asexually by a process of strobil-isation, and Blastotrochus nutrix gives rise to lateral deciduous buds(see Semper, 91). Sub-Family 2. Tcrbixolixae. Group 1. zooids solitary. Genera—Smilotrochus, M. Edw. and H. ; Turhinolw,M. Edw. and H. ; Trochocyathus, M. Edw. and H. ; Caryophyllia, Lamarck ;Stephanotrochus, Moseley. Group 2. Gemmantes. Colonies are formedby gemmation from the bases of the parent zooids. Genera—Coenocyathus,M. Edw. (Recent and Tertiary) ; Gemmulatroduis, Duncan. Group Buds are formed from a stolon-like expansion of the base. 2^? Fig. XXXV. Schematic representation of the calyxof a Zaphrentid seen from below, c, mainseptum; (i, counter-septum ; tt, trans-verse septa; (?</, chief quadrant; gq,counter quadrant. The numbers indicatethe order in which the septa are the chief quadrants the secondarysejita radiate from the chief septum, themost recently formed lying nearest to thetransverse septa, the oldest nearest to thechief septum. In the counter quadrantsthe secondary septa radiate from thetransverse septa, and the most recentlyformed are nearest to the counter septum. of the parent zooid. Genera—Polycyathus, Duncan; Agelecyathns,Duncan. Family 3. Occlinidae. Aporosa, forming irregular branchingcolonies. Asexual multiplication by mural budding. The walls of thecorallites increase in thickness exogenously, the thickening (coenenchyme)being due to the activity of the calicoblastic layer of the edge-zone. Genera—Neohelia, Moseley; Lophohelia, ^I. Edw. and H. ; Ocu
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