HOEXEUA. 
367 
The apertures are somewhat Tcrvian in their arrangement. 
There is a median irregular series with two lateral series ; in 
the latter the apertures tend to occur in transverse series, forming 
•alternate serrations on the branches. This arrangement is, how- 
•ever, far less constant than is the case in Idmonids. 
D. 6279. Two branches with prominent lateral serrations. Senonian: 
Mucronatenkreide. Riigen. Laur Coll. 
DOUBTFUL AXD UXREPBESEXTED SPECIES. 
1. COmpressa, von Hagenow, 1851. (Xame only.) 
Syx. Hornera comprcssa, von Hagenow, 1851. Bry. Maastr. Kr. p. 25. 
Histrib. — Senonian: Sweden. 
2 concatenata, von Keuss, 1869. 
Syx. Hornera concatenata, \on Keuss, I860. Bry. Crosara: Dank. Ak. tViss. 
Wien. vol. xxiv. p. 283, pi. xxxv. figs. 5, 6. 
,, ,, Pergens & Meunier, 1887. Bry. gar. Faxe : Ann. 
Soc. mal. Belg, vol. xxi., Mem. p. 217. 
•Ch.’^.h. — O f thin branches, with the apertures in transverse lateral interlocking 
series of from two to four. Obverse strongly ribbed longitudinally. 
Histrib. — Danian : Faxoe. 
Oligocene : Crosara. 
3. ? gracilis, von Hagenow, 1850. (Xame only.) 
Byx. Hornera gracili'i [non Phil.), von Hagenow, 1850. In Geinitz, 
Quadersandst. p. 238. 
Histrib. — Senonian: Kiigen. 
4. ? OCUlata, von Hagenow, 1850. (Xame only.) 
"Syn. Hornera ocnlata, von Hagenow, 1850. In Geinitz, Quadersandst. p. 238. 
,, ,, von Hageno.w, 1851. Bry. Maastr. Kr. p. 25. 
,, ,, Kade, 1852. Los. Verst. Schanzenb. p. 31. 
Histrib. — Senonian : Kiigen. 
6. trigonopora, von Hagenow, 1851. (Xame only.) 
Syn. Hornera trigonopora, von Hagenow, 1851. Bry. Maastr. Kr. p. 25. 
Histrib. — Senonian : Sweden. 
