•206 
KETECAVA. 
Aff. — This differs from R. clathrata by its straight, lateral seiics 
of apertures. 
3. carantina (d’Orbigny), 1853. 
Syn. Idmonea carantina^ d’Orbigny, 1853. Bry. Cret. p. 734, pi. 748, figs. 1-5. 
,, ,, Pergens, 1890. Revision, p. 346. 
■Char. — Apparently allied to R. subyradata, but with narrower median groove. 
Distrib. — Turonian : Angoulcme. 
4. cypris (d’Orbigny), 1853. 
8yn. Idmonea cypris, d’Orbiguy, 1853. Bry. Cret. p. 741, pi. 749, figs. 7-10. 
,, ,, Ilamm, 1881. Bry. mastr. Ob. -Sen. p. 31. 
,, ,, Pergens, 1890. Revision, p. 349. 
4/Har. — B ranches cylindrical. Apertures in curved rows of from four to five, 
crowded. Reverse face convex. 
Distrib. — Senonian — Maastrichtian : ^Nleudon ; Ciply. 
Coniaciau : Yendome. 
6. dichotoma (Gabb & Horn), 1862. 
Syn. Idmonea dichotoma, Gabb k Horn, 1862. Mon. loss. Polyz. X. Amer. : 
Journ. Acad. Xat. Sci. Phil. ser. 2, vol. v. p. 173, 
pi. xxi. fig. 64. 
.'Char. — Allied to R. clathrata by its prominent median lamina, it differs by 
hartng more crowded median apertures, and in the lateral series being less 
regular. 
Distrib. — Turonian : Timber Creek, Xew Jersey, U.S.A. 
6. gibbosa (von Hagenow), 1851. 
Syn. Idmonea gibbosa, Hagenow, 1851. Bry. Maa.str. Kr. p. 33, pi. ii. 
fig. 14. 
,, ,, Staring, 1860. Bod. Xederl. vol. ii. p. 400. 
,, ,, Hamm, 1881. Bry. mastr. Ob. -Sen. p. 32. 
iCHAR. — Allied to Retecava ramosa (Orb.), but with a series of blunt, broad 
projections on the reverse side of the zoarium. 
Distrib. — Senonian : Maastricht. 
7. grandis (d’Orbigny), 1853. 
Syn. Idmonea grandis, d’Orbigny, 1853. Bry. Cret. p. 743, pi. 749, figs. 16-19. 
,, ,, Pergens, 1890. Revision, p. 346. 
Char. — Branches elliptical in section. Apertures in rows of about six. The 
opposite series are separated by a wide median groove. 
Distrib. — Senonian — Santonian: Saintes and Pons, Charente-Inferieui’e. 
