128) W.D. Lang—Cretaceous Polyzoa of the Family Idmoniide. 
Filisparsa simplex, von Reuss, 1874, Bry. ob. Plan. : 
Paleontogr., vol. xx, pt. 2, pl. xxv, fig. 1. 
b. Apertures one to two ina series; zoarium cylindrical; zocecia im- |. 
mersed, or boundaries shown, or slightly emergent ; apertures of 
the same series distant half a diameter of an aperture. 
Idmonea Muelleri, Beissel, 1865, Bry. Aach. kr.: Nat. 
Verh. Holl. Maat. Wet., ser. 11, vol. xxii, p. 77, 
pl. ix, figs. 105-106. 
Filisparsa Muelleri, Beissel, 1865: op. cit., pl. x, 
figs. 129-131. 
B. Zoccia alternately two and three in a lateral series; zoarium flat on | 
T. Muelleri. 
reverse side, triangular in section ; zocecia immersed, with boundaries 
shown ; zocecia of same series distant two to three diameters of an 
aperture, those of different series four to five diameters of an aperture. 
Idmonea decurrens, Pocta, 1892, Mech. korye. Hory.: 
Ceska. Ak. Fr. Jos. Praze, sect. 2, pl. ii, figs. 3-6. 
C. Zocecia three to four in a lateral series. 
1. Zoarium clavate; zocecia immersed; zocecia of same series distant — 
' TL. decurrens. 
to two diameters, and those of different series four to five diameters 
of aperture. 
Clavitubigera depressa, d’Orbigny, 1853: Bry. Orét., 
pl. 747, figs. 1-5. 
2. Zoarium compressed in a plane at right angles to that of the ca 
T. sub- 
gracilis. 
and reverse faces; zocecia immersed, but their boundaries are well 
marked ; zocecia of the same series distant one to one and a half 
times, those of different series three to four times, the diameter of an 
aperture. 
Tervia Gamblei, Gregory, 1899: B.M. Cat. Cret. Bry., 
vol. i, pl. ix, fig. 9. 
3. Zoarium cylindrical or flattened in a plane parallel to that of the obverse 
T. Gamblei. 
the reverse face ; zoarium cylindrical, but reverse face is flat; 
zocecia immersed, with boundaries very slightly shown ; zocecia of 
the same series distant one-half, those of different series three to 
four times, the diameter of an aperture. 
Tervia gibbera, Gregory, 1899: B.M. Cat. Cret. Bry., 
vol. i, p. 174, fig. 12. 
b. Zoarium without ‘dorsal processes.’ 
a. Distance between the different series of apertures one and a half 
to two and a half times the diameter of an aperture; zoarium 
flattened in a plane parallel to obverse and reverse faces ; reverse 
face flat or slightly concave; zocecia immersed, but boundaries 
may be prominent. Apertures of same series distant one-quarter 
to one diameter of an aperture. 
Idmonea dorsata, von Hagenow, 1851: Bry. Maastr. kr., |. ' 
pl. ui, fig. 10. 
Idmonea dorsata, WV Orbigny, 1853: Bry. Crét., pl. 748, 
figs. 16-19. 
Idmonea dorsata,' Pergens, 1890: Revision, pl. xii, fig. 5. 
B. Distance between the different series of apertures three diameters 
of an aperture. 
1. Distance between apertures of the same series one and a half to 
two diameters of an aperture; zoarium flattened in a plane 
parallel to that of the obverse and reverse faces; zocecia 
immersed, boundaries not shown or hardly shown. 
Idmonea dorsata, var. Faxeensis, Pergens & Meunier, 1887, 
Bry. gar. Faxe: Ann. Soc. Roy. Malac. Belge, | 
vol. xxi, pl. xi, fig. 1. 
2. Distance between apertures of the same series one-half the 
diameter of an aperture ; zoarium cylindrical, zocecia immersed. 
Retepora disticha, pars, Goldtuss, 1827: Petref. Germ., 
vol. i, pl. ix, figs. ldg, h. 
1 Most of the characters of I. dorsata are not shown on Pergens’ figure. There are 
remains of what might have been ‘ dorsal processes.’ 
T. gibbera. 
and reverse faces. 
a. Zoarium with ‘dorsal processes’ without apertures projecting from 
T. dorsata. 
