130 W.D. Lang—Cretaceous Polyzoa of the Family Idmoniide. 
a. Apertures of different series distant 3-6 diameters of aperture 24 
8. Apertures of different series distant 13-8 diameters of aperture 25 
Y. Apertures 6-16 in a series. 
a. Series of apertures distant 3-4 diameters of aperture ... Bea 248) 
b. Series of apertures distant 2-3 diameters of aperture. 
1. Apertures of the same series distant 3-2 diameters of noatioes Del 
2. Apertures of the same series distant 4 aa 1 diameter of Cae 28 
2. Reverse face flat or concave, apertures 3-8 in a series Bs 5 oe 
B. Zoarium flattened in a plane parallel ‘to the obverse and reverse faces. 
I. Reverse face flat: or cpvine series of apertures close together, yen 
5-6 in a series aa 808 
II. Reverse face concave, series of ‘apertures far apart, ‘apertures 3-5 in aseries 31 
C. Zoarium clavate. 
I. Reverse face convex, apertures 8-7 inaseries ... 5012 g3 soe OL) 
II. Reverse face concave, apertures 6 in a series a3 Sa AS ea we 08 
1. RLUIPA Anse d’Orbigny, 1851: Bry. Crét., pl. 610, 
figs. 7-11... R. clathrata. 
‘2. Ps ae ie Gabb & Horn, 1860, New Amer. Foss. : 
Journ. Acad. Nat. Sci. Phil., ser. 1, vol. iv, pl. lxix, 
figs. 30-32 ae R. sagena. 
Idmonea dichotoma, Gabb & Horn, 1862, Mon. Foss. 
Poly. N. Amer.: Journ. Acad. Nat. Sci. Phil. , Ser. II, 
vol. v, pl. xxi, fig. 64... ate ... RR. dichotoma. 
3. Retecava areolata, Masson, 1887, Bry. Riig. : eebale bh, 
vol. iv, pl. iii, fig. tee ... LR. aveolata. 
4. Idmonea lineata, von Tea 1851: Bry. Maastr. kr., 
jo, TH, fe, NB son or bs ... Lt. pseudodisticha. 
5. Ldmonea gibboe, ‘von Hagenow, 1851: loc. cit., pl. ii, 
fev ae ee bef ee .. LR. gibbosa. 
6. Crisina unipora, d'Orbigny, 1851: loc. cit., pl. 618, 
figs. 1-5 oda abe ... C. unipora. 
 Crisina elegans, @’ Orbieny, ‘1851: loc. Cite, es 613, 
figs. 6-10.. a 
Tdmonea francor umn, Pergens, 1890: Revision, pl. xii fig. ie < 
Retepora gracilis, von Hagenow, 1846: in Geinitz, 
Grundr. Verst., pl. xxiiid, fig. 4 Ne dob 3D 
Crisina unipora, Gregory, 1899 : Brit. Mus. Cat. Cret. 
Bry., vol. i, pl. vili, figs. 5 and 6 ; ae “0 
Idmonea unipora, Beissel, 1865, Bry. Aach. kr.: Nat. 
Neat Holl. Maatsch. Wet., ser. 11, vol. xxii, pl. Vill, 
8. 97-99 8 R. cretacea. 
ile ree isina Abbotti, Gabb & Horn, 1862, "Foss. Poly. N. 
Amer.: Journ. Acad. Nat. Sci. Phil., ser. 11, vol. v, 
Oo, soni, ee, CH eos : Bel ... LR, Abbotti. 
Idmonea pseudodisticha, Marsson, 1887 : ‘loc. cit., pl. il, ! 
. 8b f 
8. Retepora cancellata, Goldfuss, 1829: Petref. Germ. vol. j i, 
pl. xxxvi, fig. 17 ; R. cancellata. 
Retepora cancellata, yon Hagenow, 1846: in ‘Geinitz, 
Grundr. Verst., pl. xxi, fig. 2 oat ae 3 
Idmonea cancellata, von Hagenow, 1851: "Bry. Maastr. 
kr., pl. u, fig. 7. Pes am by 
Tdmonea cancellata, @ Orbigny, 1853: loc. cit., pl. 748, 
figs. 20-23 ae i 
9. Retepora gracilis, von Hagenow, 1846: in Geinitz, ‘Grundr. 
Verst., pl. xxiii d, fig. 4 C. wnipora. 
10. Crisina subgr adata, spOniety. 1851: loc. cit., pl. 612, 
figs. 6-10. 2 ao .. R. subgradata. 
Tdmonea pseudodisticha, Marsson, 1887: ‘loc. cit., pl. ui, i 
fig. 8a a6 500 
Idmonea laticosta, Marsson, 1887 : Toc. cit., pl. ii, fig. 11 R&R. pseudodisticha. 
