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CEISINA. 
Aff. — The fomi of the zoarium resembles that of Tervia convexa^ 
but the broad median band without apertures on the obverse face 
clearly separates them. It also resembles Tervia dorsata^ from 
which the same character separates it. 
6. plana (Pocta), 1892. 
Syn. Idmonea plana, 'PocidL, 1892. Mech. Kom. TIory: Ceska Ak. Fr. Jos. 
Praze, sect. ii. p. 19, pi. ii. tigs. 1, 2. 
Char. — Zoarium broad ; apertures in curved rows of about five or six in each ; 
subpinnate in aspect. Peristomes low. 
Distrib. — Cenomanian : Kauk, Bohemia. 
Subgenus TERVIA, JuUien, 1882. 
Synonyms. 
Crisisxna, pars, d’Orbigny (1850). 
Crisina, pars, d’Orbigny (1851). 
Iclmonea, pars, d’Orbigny (1853), Pergens (1890), etc. 
Clavituhigera, pars, d’Orbigny (1853). 
Filisparsa, pars, Marssou (1887). 
Reptotubigei'a, pars, Bucuille (1890). 
Diagnosis. 
Cr (since with an open tufted zoaiium. 
Zooecia occuning in alternate rtansverse senes with a median, 
unpaii'ed seiies scattered along the middle line of the branches. 
Type Species.^ 
Tervia solida, Jullien, 1882. Drag. Trav., Biy. : Bull. Soc. zool. 
France, vol. xii. 1882, p. 501, pi. xvii. figs. 72, 73. Recent: 
Bay of Biscay. 
Affinities. 
This subgenus was founded as a genus by AC. Jullien ^ on some 
recent species. The palaeontological history of the vaiiation is in 
favour of its subgeneric value. The oldest species of the subgenus 
is the T subgracilis (Orb.). 
^ Jullien described four species, of which T. solida appears to be the most 
suitable type. 
2 Jullien. Dragages du “ Travailleur, ” Bryozoaires : Bull. Soc. zool. France, 
vol. vii. 1882, p. 600. 
