4 
sf 
184 Fossil Corals of the family Cyathophyllide. 
the sides, and occasionally dissepiments may be distinguished between 
the separated parts, when not apparent between the several lamella 
themselves. 
Genus 3. Ampniexus, Sowerby... Stems subcylindrical,  un- 
even. Corallum within transversely septate, septa very broad 
and nearly straight, extending quite to the sides; cells many 
rayed 
The species of Amplexus ‘are aint tinh by their uneven cylin- 
drical forms, having the internal septa extending quite across the whole 
interior. They are thus closely related to the Calophylla, and it may 
be a question whether the two genera should not be united in one, unless 
it is thought best to pursue the system, apparently impracticable, of 
forming separate groups of the cylindrical, columnar, and massive 
species of the genus Cyathophyllum. 
The name Cyathophora has been applied by Michelin to fossil co- 
rals near the above, but massive in structure, and the rays obsolescent. 
They are often prismatic, like the Favosites, though larger. They may 
be viewed as massive species either of Amplexus or Calophyllum. 
Sowerby, Mineral Conchology, i, 165, pl. 72. Phillips, Paleozove 
Fossils, p. 7, pl. 3, fig. 8. Michelin, Icon. Zoophyt., 104, pl. 26, fig. 
1. Michelin’s genus is thus characterized by him: Fixum, glome- 
rato-globosum vel ramosum, tubulosum ; superficie cellis immersis ; 
cellis sparsis, per diaphragmata transversa divisis, distinctis, obsoleté 
pi se lamellis subnullis. ‘The species referred to the genus is from 
e Ooli 
Genus 4, Caninta, Michelin. Quite simple or aggregato-gem- 
mate. Corallum within transversely septate ; cells concave; one 
or more rays of the star on one side obsolete, and the transverse 
septa beneath this part having a funnel-shaped depression ; gene- 
ral texture like that of the Calophylla. 
This genus, instituted by Michelin, includes a few species of Cya- 
thophylla with a depression on one side of the star, and some appear- 
ance like asiphuncle. The depression is apparent in all the transverse 
septa below. Koninck doubts the grounds on which the genus is 
founded ; but Michelin states that he has observed the characteristic 
in a large number of specimens. Good drawings of it are given in his 
Iconographie Zoophytologique, pl. 16. This peculiarity has not been 
observed in any massive species, 
Genus 5. Acervutaria, Schweigger.. Ramose or aggregate. 
Corallum imperfectly transverse septate, or not at all so; cells 
acervately proliferous. 
