Geology and Natural History. 69 
polyps are somewhat decomposed, and some of the specimens are 
in some places lacerated. They all are, however, sufficiently per- 
on which this genus is based, is P. guadrangularis, of which a 
long and interesting description from Prof. Forbes is gi 
Johnston’s British Zodphytes (vol. i, pp. 164-166). In that spe- 
cies, however, the axis is “acutely quadrangular,” and the polyps 
are arranged in three longitudinal series, corresponding to three 
of the “angles of the stem.” eee 
In the specimen presented by Dr. Blake, the style of axis Is 
round and the polyps are arranged in two longitudinal unilateral 
Series, which conform to the convexity of the external fleshy coy- 
ermg. With these differences, I think I am justified in placing it 
in a new sub-genus, for which I propose the name of Verridlia, in 
ss of Prof. Verrill of Yale College. 
enu RI uvier. - 
P olypidom linear-elongate, round, oval or ovate in cross-section. 
xis round, slender, bony; polyps arranged in two unilateral 
longitudinal series, 
Verrillia Blakei Stearns, n. s. 
toward the tip, as well as decreasing in the opposite direction to 
where the polypiferous rows terminate or become obsolete. From 
axis, and the surface quite smooth ; said portion, as well as the 
base, is round (in cross section); the basal part is from one-ninth 
to one-eleventh of the entire length, and about one inch in diam- 
eter, with the surface longitudinally wrinkled or contracted, pre- 
Senting a ridged or fibrous appearance. 
_ Style or axis long, slender, white, hard, bony, somewhat pol- 
ished, about three-sixteenths of an inch in diameter in the thickest 
ee tapering gradually toward the tip, and attenuated, with sur- 
face somewhat roughened toward the basal extremity. Inclosed 
in the polyp-mass or polypidom, the axis is central from the base 
to where the polyp-rows begin, when it soon becomes marginal or 
lateral, forming a prominent rounded ee (free from polyps) on 
one side of the polypiterous portion of t whole. 
