HEMICELLAKIA. 
369 
the generic name to the royana group of species. ^ Reteporidea'' 
royana has an infundihulifonn reticular zoarium, with the 
apertures in transverse altemate rows, and with the walls pitted 
by maculae. The other species included by d’Orbigny in the genus, 
according to his later use of the name, have similar zooecial 
characters, hut the zoarium is not reticular. This character is 
therefore not generic ; and the species of Laterocava in other 
respects agree with those of Hemicellaria and with those placed 
by d’Oibigny in 1854 in Reteporidea. 
Hemicellaria royana (d’Orbigny), 1850. 
Syxoxtmt. 
lieteporidea royana, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 937- 
,, ,, d’Orbigny, 1851. Bry. Cret. pi. 608, figs. 1-5. 
,, ,, d’Orbigny, 1853-4. Ibid. p. 937, pi. 772, fig. 17. 
Hormra ,, Pergens, 1890. Bevision, p. 354. 
lUteporldea dactyhis, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 264. 
,, ,, d’Orbigny, 1851. Biy. Cret. pi. 607, figs. 13-16. 
non Filled vea ,, d’Orbigny, 1853. Ihul. pi. 773, figs. 8-11. 
,, ,, pars, Pergens, 1890. Bevision, p. 351. 
Diagnosis. 
Zoarium reticular and infundibuliform. Branches cylindrical. 
Apertures in alternate rows of three or four ; the rows often 
overlap. 
Peristomes well raised. 
Dimensions. 
Zoarium : width of funnel 
height of funnel 
diameter of stem 
height of stem 
Apertiues : diameter 
B.M., 60,560. 
20 mm. 
3-5 „ 
•08 ,, 
D.ISTPtIBETION. 
Senonian — Maastrichtian : Boyan, Charente-Inferieure, in Craie a Budistes ; 
Meudon. 
60,560. A well-preserved specimen. Senonian : Craie a Budistes. Boyan. 
Presented by Hon. B. Marsham, 1878. 
