140 J. E. DurrpEN—Jamaican Aetiniaria : 
Four to six very distinct, sucker-like verrucee are developed in each row, and 
a few smaller examples may be continued below; the larger are capable of attach- 
ing pieces of fine gravel, fragments of shells, etc., to the column. The rows of 
verrucee correspond with only certain of the mesenterial divisions as seen exter- 
nally, and sometimes a single apical verruca may alternate with the principal rows. 
A circle of prominent, rounded acrorhagi occurs at the apex of the column; 
these are double in number the rows of verruce, and alternate with the outermost 
row of tentacles. Sometimes a smaller acrorhagus alternates with the larger. A 
shallow fossa intervenes between the cycle of acrorhagi and the commencement of 
the tentacular region. 
The peripheral tentacles are numerous, slightly entacmzeous, shortly conical, 
and overhanging, the oral face being longer than the external. The number 
varies; the normal arrangement appears to be 6, 6, 12, 24, 48, &c.; one specimen 
bore 19, instead of 15, enclosed within the radii from two tentacles of the first 
cycle; the tentacles of many small polyps were counted in which the normal 96 
were present, while in one specimen the irregular number 106 occured (Pl. x., fig. 1). 
In the majority of polyps, the tentacles bear several transverse, opaque 
thickenings, most strongly developed along the oro-lateral area of the tentacles, 
where a distinct bilobation is often observable (PI. x., fig. 2). Six or seven pairs of 
tubercles, arranged pinnately, may be present on the larger tentacles, diminish- 
ing a little in prominence both proximally and distally. The tentacles are smooth 
for some little distance from their origin, and remain so throughout their outer 
concave aspect. 
Many polyps were procured wholly destitute of the thickenings, the tentacles 
being quite smooth, differently coloured, and presenting an entirely distinct 
appearance from the usual form. At first I had no hesitation in regarding these 
as a second species; but an acquaintance with scores of specimens, all living 
within the same area, revealed every stage in the presence or absence of the 
tubercles, some examples having only odd tentacles smooth, while others have 
only a few tuberculated. 
The disc is very large, thin-walled, and, periphally, is thrown into 8-12 folds, 
and may overhang the column to a great extent; its middle region is flat, or may 
be slightly convex. The surface of the disc is characterized by the presence of 
small, wart-like projections, varying in size and arranged mostly radially; they 
correspond with the first and second cycles of tentacles, and sometimes with the 
lower orders. In large specimens, the tubercules may extend in great numbers 
over nearly the whole of the disc, even as far as the peristome, and vary consider- 
ably in number, size, and distance apart in each row. Before the peristome 
is reached they become more elosely and irregularly arranged, and seem to 
correspond with all the mesenterial spaces (PI. x., fig. 1). 
