366 
HORXERA. 
‘ subsidiary cells ’ (Xebcnzellen) ; bis figures ’ show the presence 
of maculse. 
Phormonotos was founded by ^larsson on d’Orbigny’s Filisparsa 
-crassa. He included in the genus a second species, P. gracilis, 
which may be based on thin distal ends of branches of H. langethali, 
while Filisparsa pulchella, Mars., may represent a still younger 
stage. 
Hornera langethali (von Hagenow), 1839. 
Stnoi^ymy. 
Eetepora langethali, von Ilageuow, 1839. Mon. Riig. : X. Jahrb. 1839, p. 281. 
,, ,, von Hagenow, 1846. In Geinitz, Grundr. Verst, p. 590. 
Hornera ,, Eomer, 1840. Verst, nordd. Kr. p. 20. 
,, ,, A’on Hagenow, 1850. In Geinitz, Quadersandst. p. 238. 
,, ,, Kade, 1852. Los. Verst. Schanzeub. p. 30. 
,, ,, Marsson, 1887. Bry. Riig. : Pal. Abb. vol. ir. p. 32, 
pi. iii. bg. 2. 
? Fhormonotos gracilis, Maisson, 1887. Ibid, p. 34, pi. iii. fig. 6. 
? Filisparsa 2 nilchella , Marsson, 1887. Ibid. p. 35, pi. iii. fig. 7. 
Diagnosis. 
Zoarium of cylindrical branches, which are laterally serrate, 
owing to the projection of the lateral peristomes. The 
obverse face is smooth and maculoe seldom open on the surface. 
Apertures large. They occur in an irregular median scries, 
and the lateral apertures occur in somewhat irregular, 
alternate rows. 
The axial group of zooecia is equal in diameter to half that of 
the branch. 
Eeverse face longitudinally furrowed, and bearing tubuli. 
Histeibutiox. 
Senouian — Campanian : Riigen. 
Affinities. 
This species is included in Hornera by Eomer and Marsson, 
and it appears to agree in all essential characters with the 
Cainozoic species of that genus. 
1 Marsson. Bry. Riig. : Pal. Abb. vol. iv. pt. 1, pi. iii. figs. Zc, d. 
