ATAGMA. 
401 
3. micropora, von Hagenow, 1851. 
Syx. Cavaria micropora ^ von Hagenow, 1851. Bry. Maastr. Kr, p. 54, pi, vi. 
fig. 3. 
,, ,, Kade, 1852. Los. Yerst. Schanzenb. p. 32. 
,, ,, d’Orbigny, 1854. Bry. Cret. p. 798. 
,, ,, Hamm, 1881. Bry. mastr. Ob. -Sen. p. 25. 
Char. — Zoarium of tliick, cylindrical stems, with apertures well spaced. Tbe 
intertabular chambers are low, tbe tabulae being crowded. 
Distrib. — Senonian — Maastiicbtian : Maastricht. 
Aff. — D’Orbigny suggests that this Bryozoan is only a worn form of that which 
von Hagenow described as C. pustulosa (for which see p. 137). 
ATAGMA, Lonsdale, 1850. 
[Dixon, Geol. Suss. p. 311.] 
Synonyms. 
Ceriopora, pars, Michelin, 1843. 
Reptomulticlausa, d’Orbigny, 1853. 
Ditaxia, pars, Pergens, 1890. 
Diagnosis. 
Petaloporidae with dendroid zoarium formed of an axial bundle 
covered with several lamellae. 
Apertures distributed irregularly ; either over the whole surface, 
in transverse groups separated by bands without apertures, or 
in loose groups. 
Maculae variable in development; ranging from single circular 
series to broad bands. 
Type Species. 
Atagma lonsdalei, n.sp. Syn. Atagma papularia^ Lonsdale, non 
(Mich.). Chalk : Sussex. 
Affinities. 
This genus is a Petaloporid with an Inversarian habit of growth. 
It differs from the French species which Lonsdale assigned to it, 
as that has dactylethrae and hollow soHd stems. 
1. Atagma lonsdalei, nov. 
Synonymy. 
Atagma papularia [non Mich.), Lonsdale, 1850. Dixon, Geol. Suss. p. 311,, 
pi. xviii. B, fig. 6. 
DD 
