66 
OSCULIl'ORID^. 
D. 3386. Twelve specimens of the irregular variety. Maastrichter Kalk. 
Maastricht. Van Breda Coll. 
D. 3387. Twenty specimens of the irregular variety. Maastrichter Kalk. 
Maastricht. Van Breda Coll. 
D. 3516. A fragment of the irregular variety (on slide). Maastrichter Kalk. 
Maastricht. Van Breda Coll. 
D. 3605. One irregular zoarium (on slide). Maastrichter Kalk. Maastricht. 
Van Breda Coll. 
D. 3761. A specimen of the t}'pical variety (on slide). Maastrichter Kalk. 
Maastricht. Gamble Coll. 
D. 5140. Sixteen specimens of the irregular variety. Maastrichter Kalk. 
Maastricht. Van Breda Coll. 
D. 6419. A specimen labelled Idmonea disticha, Goldf. ? Maastrichter Kalk. 
Maastricht. Busk Coll. Presented by Miss Busk. 
UNREPRESENTED SPECIES. 
1. dentata (von Hagenow), 1851. Name only. 
Syn. Truncatula dentata, von Hagenow, 1851. Bry. maastr. Kr. p. 25. 
Distrib. — Cretaceous : Sweden. 
2. gracilis (von Hagenow), 1851. Name only. 
Syn. Truncatula gracilis, von Hagenow, 1851. Bry. maastr. Kr. p. 25. 
Distrib. — Senonian — Campanian : Eiigen. 
3. houzeaui, Pergens, 1894. 
Syn. Osculipora houzeaui, Pergens, 1894. Xouv. Bry. Cret. Limb. : Bull. Soc. 
beige Geol. vol. vii., Mem. p. 174, pi. x. fig. 3 
{non 4 as misprinted). 
Char. — A very irregular zoarium, 2-6 mm. wide ; erect or adnate. The apertures 
are in alternate or siibalternate groups, which vary greatly in size and shape, 
and have from two to five rows in each. 
Distrib.— -Senonian — Maastrichtian : Fauquemont, near Maastricht. 
Apr. — It differs from the other Maastrichtian species by the great irregularity of 
the zoarium and fasciculi. 
4. poly stoma (von Hagenow), 1851. Name only. 
Syn. Truncatula poly stoma, von Hagenow, 1851. Bry. maastr. Kr. p. 25. 
Distrib. — Senonian — Campanian : Eiigen. 
6. royana, d’Orbigny, 1850. 
Syn. Osculipora royana, d’Orbigny, 1850. Prod. Pal. ii. p. 268. 
,, ,, d’Orbigny, 1853. Bry. Cret. p. 679, pi. 800 5is, figs. 1-4. 
,, ,, Pergens, 1890. Eev. p. 377. 
Char. — Zoarium retiform, horizontal ; branches dichotomous and anastomosing, 
and keeping in the same plane. Branches nearly round ; obverse face has very 
