25 
Section B . — PERFORATA. 
Family— FA VOSITIBjE. 
Ohs. — Only two genera of Pavositidae have come under my notice — 
Trachypora, Edwards & Haimc, and Michelinia, Ee Koninck. The former 
is hy far the richest numerically, although one species of each is only known, 
hut the latter is very rare. 
The described species of Trachypora arc Devonian, hut Prof. II. A. 
XicholsoiT has suggested that hy the union of other hardly-separal)lc genera 
“ the genus will ultimately he shown to range from the Upper Silurian to the 
Carhoniferous.” Michelinia occurs both in the Devonian and Carboniferous. 
Genus — TP^ACHYPORA, Edivards and Uaime, 1851. 
Trachypora, Edw. & II., Arcliiv. Mus. Hist. Nat. Paris, 1851, V, p. 305. 
„ Nicholson, Tab. Corals Pal. Period, 1879, p. 102. 
Gen. Char. — Corallum dendroid, of complex cylindrical stems, attached 
hasally to foreign bodies, and composed of conical corallites which diverge 
with an increasing curvature from an imaginary axial line to open on all 
parts of the free surfaces. Corallites essentially polygonal, in close contact, 
their proper walls usually not obliterated, and in no case separated hy the in- 
tervention of a true coenenchyma. Interior of the tubes contracted hy the 
deposition of numerous concentric layers of selerenchyma, which increase in 
amount as the surface is approached. Calices superficially vridely distant 
from one another, arranged in irregular longitudinal rows, the interspaces 
between them, formed hy their enormously-thickened lips, being ornamented 
with grooves or ridges. Septa represented hy radiately-placed spines or 
tubercles, or obsolete. Tahulas few, remote, complete. Mural pores 
generally well marked, hut few and irregular {Nicholson). 
Ohs . — Without entering into the relations of Trachypora to Bendro- 
pora, Michelin, and Bhahdopora, Ed. & II., which have been so ably 
handled hy Prof. Nicholson, it affords me much pleasure to introduce a form 
from the Ujiper Marine Series, which appears to he a species of the first-named 
genus, in some of its characters bridging over the interval between it and 
Tab. Corals Pal. Period, 1879, lOtJ. 
