EETECAVA. 
197 
5. Retecava carinata (Eomer), 1840. 
Stxoxt^. 
Idmonea carinata , Romer, 1840. Verst, nordd. Kr. p. 21, pi. v. fig. 20. 
non,, „ .?:\Ianzoiii, 1878. Brioz. Mioc. Austr. : Deuk. Akad. 'Wiss. 
Wien. vol. xxxviii. pt. 2, p. 5. 
non,, ,, ,5?Segueuza, 1880. Fomiaz. Terz. Reggio : Atti Acc. Line, 
ser. 3, Mem. vol. vi. p. 132. 
,, ,, pars, Pergens, 1890. Revision, p. 348. 
,, ,, Pergens, 1893. Bry. St. Pat. : Bull. Soc. beige Geol. 
vol. vi. p. 204. 
,, ,, Pergens, 1895. Bry. Arcbe de Leves : Bull. Soc. beige Geol. 
vol. viii. p. 134. 
,, sulcata, von HagenoAv, 1851. Bry. Maastr. Kr. p. 32, pi. ii. 
fig. 12. 
,, ,, Kade, 1852. Los. Verst. Sclianzeub. p. 31. 
,, cytherea, d’Orbigny, 1853. Bry. Cret. p. 746, pi. 750, figs. 11-15. 
,, ,, Staring, 1860. Bod. Nederl. vol. ii. p. 400. 
,, ,, Hamm, 1881. Bry. mastr. Ob. -Sen. p. 31. 
,, striolata, Marsson, 1887. Brv. Riig. : Pal. Abb. vol. iv. p. 28, pi. ii. 
fig. 9. 
Diagnosis. 
Zoarium of free dichotomous branches, Tvhich remain in approxi- 
mately one plane. The branches consist of a large cydindiical 
reverse axis, longitudinally striated, and a triangular aperture 
hearing ridges on the obverse face. The proximal portions 
of the zooecia fonning the axis are very long and numerous. 
.Vpcrturcs in regularly alternate, crowded, vertical or oblique 
roAvs of from three to seven. 
The series are very crowded, forming the obverse keel. 
Distribution. 
British : 
Upper Chalk: Magee Island, Xortli Ireland. 
Foreign : 
Senouian — Maastrichtian : Maastricht ; Fauqiiemont ; Falkenberg ; 
Bemelen. 
Campanian : Riigen. 
Santonian: L’ Arche de Leves, near Chartres, Indre-et- 
Loire. 
Coniacian : Les Roches, Loir-et-Cher ; Ste. Paterne. 
