Xll 
SYNOPSIS OF GENERA. 
parent tube turns upwards and ceases growth, and the young cells continue 
the growth of the colony. Tubes without pores, and commonly without 
diaphragms; sometimes with radiating lamellae. 
Examples: Aulopora Schoharie, pi. ii, figs. 1-6. 
Aulopora tubula, pi. ii, figs. 7, 8. 
Vermipora, Hall (Twenty-sixth Ann. Rept. N. Y. State Mus. Nat. Hist., p. 
109. 1874. [Type, Yermipora serpuloides, Hall.] 
Corallum ramose, consisting of continuous serpula-like cell tubes, without 
intercellular tissue, arising from the center of the branch, and increasing by 
lateral gemmation. No transverse diaphragms or mural pores have been 
observed in the typical species of the genus. 
Example : Vermipora serpuloides , pi. ii, figs. 24-31. 
Striatopora, Hall (Pal. N. Y., vol. ii, p. 156. 1852). 
[Type, Striatopora flexuosa, Hall.] 
Corallum ramose, composed of thick walled tubes arising from the center of 
the branch, turning outwards to the surface and opening in an expanded aper¬ 
ture. The interior of the tubes is marked by strong longitudinal strige or 
ridges, and numerous mural pores connecting the cells; diaphragms often 
present. 
This genus is closely related to Cladopoka, from which it is distinguished 
principally by the greater development of the longitudinal strise within the 
cell tubes, and more frequent mural pores. 
Example: Striatopora Issa, pi. iii, figs. 14, 15. 
Michelinia, DeKoninck (Desc. An. Foss. Carb. Belg., p. 29. 1842). 
[Type, Manon favosum, Goldfuss.] 
Compound hemispherical corals, composed of elongate conical tubes, which 
are usually in contact for their entire length, and connected by mural pores. 
Tubes strongly striated longitudinally, and, in the larger species, intersected by 
numerous coarsely vesiculose diaphragms. 
The Lower Helderberg form, referred to this genus, is not a characteristic 
species, on account of the absence of diaphragms and the few short campanulate 
cell tubes composing the corallum. 
Example: Michelinia lenticularis, pi. iii, figs. 1, 2, 3, 5. 
