194 
RETECAVA. 
D. 1321. Four branches (on slide). Maastrichter Kreide. Falkenberg. 
Vine Coll. 
D. 3357. A fragment of a zoarium showing obverse side (on slide). Maastrichter 
Kreide. Maastricht. Van Breda Coll. 
D. 3366. A branched fragment of a zoarium (on slide). Maastrichter Kreide. 
Maastricht. Van Breda Coll. 
3). 3033. A zoarium (iu tube). Maastrichter Kreide. Maastricht. Van Bitnla 
Coll. 
B. 3518. Four zoaria (in tube). Maastrichter Kreide. Maastricht. Van Breda 
Coll. 
B. 3234. A thick base of a zoarium (on slide). ISraastrichter Kreide. 
Maastricht. Van Breda Coll. 
B. 7058. A longitudinal section cut from one of the specimens D. 3518. 
Maastrichter Kreide. Maastricht. Van Breda Coll. 
B. 3229, B. 3230. A zoarium and three fragments. Maastrichter Kreide. 
Maastricht. Van Breda Coll. 
B. 3237. A zoarium with a broad base. Maastrichter Kreide. Maastricht. 
Van Breda Coll. 
B. 6424. Twelve fragments (on slide). ^Maastrichter Kreide. Maastricht. 
Busk Coll. 
4. Retecava lichenoides (Gohlfuss), 1827. 
^Synonymy. 
lietepora Uchenoidcs, Goldfuss, 1827. Petref. Germ. vol. i. p. 29, pi. ix. fig. 13. 
,, ,, Morren, 1829. Cor. foss. Belg. : Ann. Acc. Groning. 
1828, p. 36. 
,, ,, Milne Edwards, 1836. In Lamarck, Hist. nat. Anim. 
sans Vert., 2nd ed., vol. ii. p. 283. 
lleteporldea ,, d’Orbigny, 1849. Gen. nouv. Bry. : Bev. Mag. Zool. 
ser. 2, vol. i. p. 500. 
Idmonea ,, von Hagenow, 1851. Bry. Maastr. Kr. p. 28, pi. ii. fig. 6. 
,, ,, Kade, 1852. Los. Verst. Schanzenb. p. 31. 
,, ,, Winkler, 1864. Mus. Teyl. : Cat. Pal. livr. ii. p. 212. 
non ,, ,, Schreiber, 1884. Beitr. mittelolig. Gruns. Madgeb. p. 9, 
pi. ii. fig. 11. 
Crisina ,, d’Orbigny, 1854. Bry. Cret. p. 913. 
,, ,, Ubaghs, 1888. Compt. Bend. Exc. : Bull. Soc. beige 
Geol. vol. i,, Mem. p. 233. 
,, ,, Hamm, 1881. Bry. mastr. Ob.- Sen. p. 31. 
Crisidmonea ,, Marsson, 1887. Bry. Biig. : Pal. Abb. vol. iv. p. 30. 
Codophyma gramclatiim, von Hagenow, 1851. Bry. Maastr. Kr. p. 106, pi. ii. 
fi^:. 17. 
Diagnosis. 
Zoarium rising from a discoid base ; the branches gi'ovr as 
a reticular flabelliform expansion. The branches are laterally 
compressed, and eonsist of a thin or subtriangular lamina 
