CA R YOPE YLLIA CEA . 
TURBINOLIAL.E. 
THE KNOTTED WEDG E-COE AL. 
SphenotrocJius Wrigh tii. 
Plate X. Fig. 3. 
Sjiecifio Character. Corallum pedicellate, with swelling nodes; ribs 
papilliferous on the body, and crossed with zig-zag folds on the pedicel. 
Sphenotrochus Wrightii. Gosse, Nat. Hist. Review^, vi. 161 ; pi. xvii. 
figs. 1 — 1. 
GENERAL DESCRIPTION. 
Corallum. Simple, straight (or else with the base considerably curved 
laterally), compressed above (the axes of the disk being 60 ; 42 in general ; 
in one example, however, 60 : 50), but rounded in the lower two-thirds, 
pedicellate ; the body and the pedicel varying exceedingly in their rela- 
tive proportions, the former being to the latter as 1 : 5 in one example ; 
in another, as 1 : 1; in another, as 1 : 1‘2, — no tw'o of tho four specimens 
in my possession being alike in this respect. The pedicel is surrounded 
hy four to six constrictions, vai’ying greatly in their relative distance : 
these separate nodes are moi'e or less swollen, of which one, a little above 
the base, is usually more vcntricose than the rest; the pedicel generally 
enlarges upwards, but its distinction from tho body is marked by an 
abrupt shoulder. 
Rihs. About as wide as the intoi’spaces, di.stinctly traceable only as far 
down as the termination of the body ; their course is irregularly angular ; 
the primaries and secondaries terminate at the shoulder in 
prominent knobs. On the pedicel only the six lU'imaries are 
distinguishable, and these are then crossed by numerous 
strongly indented zig-zag folds, of which the higher angle 
is on the rib, tho lower in the inter.spacc. All the ribs of 
the body-region are’studded with irregularly projecting points 
or papillary eminences. 
Ba.’^e. A small but distinct circular cavity, into which tho 
extremities of the six primary ribs project. 
Calice. Considerably arched, the short axis being much 
(magnified), the higher; rather deep. 
Plates. Tw’enty-four, in three cycles; the lateral primaries 
and secondaries more developed than (he terminal ones ; moderately close- 
sot, irregularly bent in their planes, thick exteriorly, suddenly diminishing 
