LOPHOLEPIS. 
51 
Diagnosis. 
Apertures grouped into somewhat elliptical series, which are 
irregularlj' scattered throughout the zoarium. The groups of 
apertures include up to about fifty apertures in a group. 
Disteibution. 
Senonian — Maastrichtian ; Maastricht. 
D. 6345. A zoarium of var. irregularis (on slide). Maastriehter Kalk. 
St. Pierre ; Maastricht. Busk Coll. Presented hy Miss Busk, 
1899. 
2. Lopholepis alternans, von Hagenow, 1851. 
Synonymy. 
Lopholepis alternans, von Hagenow, 1851. Bry. maastr. Kr. p. 39, pi. hi. 
figs, \ld-f. 
,, ,, d’Orbigny, 1853. Bry. Cret. p. 687. 
,, ,, pars, Hamm, 1881. Bry. mastr. Oh. -Sen. i.,Cycl. p. 33. 
Theonia ,, Ubaghs, 1879. Descr. Geol. Pal. Limb. p. 222. 
Diagnosis. 
Groups of apertures in an irregular, alternate series. The 
groups of apertures are united at their inner ends to form 
a continuous series along the middle of the zoarium. 
Distribution. 
Senonian — Maastriehter Kalk : Maastricht, Geulheim, ? Bemelen, Petit- 
Lanaye. 
Affinities. 
This species may be only a varietj^ of Lopholepis radians^ Hag., 
formed by the growing together of the zooecial bundles. Hamm 
keeps it distinct from Z. radians, and places Z. irregularis as a 
synonym, whereas it appears to me that Z. irregularis more nearly 
resembles Z. radians than Z. alternans. Von Hagenow apparently 
originally regarded the three species as one, they having all been 
numbered fig. 1 1 on his plate. 
LIST OF SPECIMENS. 
D. 6343. Three broken zoaria (on shde). Maastriehter Kalk. Geulheim. 
Busk Coll. Presented by Miss Busk, 1899. 
1 D. 6346. A broken specimen, which may be one side of a specimen of this 
species ; the other specimen on the same slide is a large compound 
Actinopora diadema. The slide is labelled by Busk Lopholepis 
radians. Maastriehter Kalk. Bemelen. Busk Coll. Presented 
by Miss Busk, 1899. Vide antea, p. 20. 
