no 
DESMEPORIDiE. 
DESMEPORA, Lonsdale, 1850. 
[In Dixon, Geol. Sussex, p. 281.] 
Synonymy. 
Desmeopora,^ Lonsdale, 18o0 ; pars, Ulrich, 1900. 
Yon Eeuss, 1872; Marsson, 1877; pars, Bucaille, 1890; TIennig, 1894. 
Idmonea, pars, Romer, 1840 ; Mantell, 1844. 
Retepora, pars, von Hagenow, 1846. 
Osculipora, pars, d’Orbigny, 1850. 
Tr^mcatula, pars, di'Ovhipiy, 1854; Winkler, 1864. 
Semicytis, pars, Marsson, 1887. 
Diagnosis. 
Desmeporidae in which the zoarium grows as tufts of dichoto- 
mizing branches, which consist of a central core of zooecia, 
surrounded by a cancellate layer. Alternate bundles of zooecia 
rise from the central core, and their apertures open in groups 
at the margin of the obverse face ; they are separated by wide 
areas, covered by cancelli. 
Type Species. 
Idmonea semicylindrica, Romer, 1840 : Verst, nordd. Kr. p. 20, 
pi. V. fig. 21. Senonian : Germany. 
Affinities. 
This genus differs from the Osculiporidae by the possession of 
the external cancellate zone. The form of the zoarium resembles 
Somoeosolen among the Osculiporidae, but Desmepora is widely 
separated from that genus, as its structure is cancellate. 
1. Desmepora semicylindrica (Romer), 1840. 
Synonymy. 
Idmonea semicylindrica, Romer, 1840. Verst, nordd. Kr. p. 20, pi. v. fig. 21. 
Retepora ,, von Hagenow, 1846. In Geinitz, Grundr. Verst, vol. ii. 
p. 591. • 
Desmeopora ,, Lonsdale, 1850. In Dixon, Geol. Sussex, p. 281, 
pi. xviiiA, figs. 6-6(?. ' 
non Desmepora ,, von Reuss, 1872-3. Bry. unt. Quad. : Palaeontogr. 
vol. XX. pt. i. p. 123, pi. XXX. figs. 6-8. 
,, ,, Marsson, 1887. Bry. Riig. : Pal. Abh. vol. iv. p. 37, 
pi. iii. fig. 11. 
^ As von Reuss and Marsson have pointed out, the name comes from SeVuTj, 
a ‘ bundle,’ not from deo-juSs, a ‘ bond ’ or ‘ fetters ’ ; so that Desmepora is the 
correct form. 
