i 
My 
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~ numerous vertical la- 
Paleozoic Corals and Foraminifera. . 127 
q giving avery irregularly angulose section to the stem ; surface 
smooth; internal structure as given in the generic character. 
Rare in the carboniferous limestone of Derbyshire. 
(Col. University of Cambridge.) 
Heterophyllia ornata (M‘Coy). 
Sp. Char. Stems subcylindrical, long, flexuous, averaging 1 line 
in diameter, with about sixteen narrow, subequal, longitudinal 
ridges sharply defined, and separated by flat spaces rather 
wider than the ridges they separate, the ridges are set with 
small round tubercles more than their own diameter apart ; 
surface very minutely granulose: internal structure as in 
generic character ; horizontal section, lamelle about fourteen 
at the margin. , 
Rather rare in the carboniferous limestone of Derbyshire. 
(Col. University of Cambridge.) 
Siphonodendron (M‘Cov), n. g. 
Gen. Char. Corallum of variously aggregated, branching, cylindri- 
cal or elongate-conic stems; young branches produced by lateral 
buds ; outer wall thin, 
lined by two or three 
rows of small vesicular 
plates forming a narrow 
outer vesicular area in 
both sections ; terminal 
cups deep, lined by 
melle, alternately larger 
and smaller, and having 
in the bottom a small, 
prominent, tubular axis: 
vertical section shows a 
small, central, persist- Recent Lithodendron. Siphonodendron. 
ent, siphon-like tube @ Mode of growth «a. Mode’ of growth 
or axis, which pierces “is vertical sec- jee vertical sec- 
through a series of long, 5, Horizontal section. 
conical or dome-shaped 
transverse diaphragms occupying the greater part of the 
width of the tube, the convexity upward, forming in this sec- 
tion lines diverging downwards and outwards from the axis, 
till they reach the narrow external cellulose layer on each 
side: horizontal section shows the small tube-like axis, sur- 
rounded usually by a few thin concentric lines which are the 
edges of the conoidal diaphragms cut through by the section ; 
