336 J. E. DurrpeEn—Jamaican Actiniaria: Part I.—Zoanthee. 
non-pedunculate, practically of the same diameter throughout, but often with 
slightly expanded portions at the base. In extension the margin of the column 
is crenate, the elevations alternating with the outer row of tentacles; on partial 
retraction, the capitular fossa is well seen. Both inner and outer capitula bear 
fine ridges and grooves. In complete retraction, numerous minute capitular 
striz can be seen only on the outer capitulum. Tentacles about 60, arranged 
in two cycles; one specimen had 32 in each row. Disc not much depressed, 
walls thin; the mesenterial lines can be seen through them ; mouth slit-like, the 
cesophageal groove not distinguishable ; cesophageal walls thin, showing the mesen- 
terial lines; in some examples, the wall is thrown into ridges and furrows. 
Ccenenchyme little developed, appears only as a flattened expansion from one 
side of a polyp and connected with one or more other polyps near; in other 
cases, the connecting strand becomes constricted and stolon-like. Isolated 
polyps devoid of any ccenenchyme are met with, even when closely associated. 
The polyps and ccenenchyme adhere firmly to the rocks or stones. New 
individuals arise by budding from the slightly expanded base of other polyps, 
and afterwards become more separated, the connecting tissue getting thinner and 
thinner until the polyps may become entirely isolated. 
Colowr..—Column in its lower part, especially when embedded in foreign 
matter, sand-coloured, becoming a dark blue or slate colour above. The 
margin has irregularly disposed, silvery white, triangular, narrow, radiating 
patches, often incomplete and variable in length; the toothed elevations are 
nearly opaque white. These white markings, which appear constant for the 
species, are best seen on partial contraction, at which time the inner capitulum 
appears as a distinct whitish, toothed, circular annulus. Colours of the tentacles 
and disc are variable. In a colony from Lime Cay both were a bright orange 
brown, and the peristome a bright green; in another large colony from Maiden 
Cay the tentacles were green on their inner aspect and dark brown on the 
outer, the disc a dark brown with bright green peristome ; specimens at 
Rackum Cay showed a bright blue disc with green lips, and the tentacles a 
bright green. 
Dimensions.—The height differs considerably, dependent upon the position 
of the polyps in a colony; it may vary from 2:7 cm. to 0-4 cm.; the 
diameter is about 0°6 em., and is generally constant throughout the column, 
and independent of the length. The measurements are taken from specimens 
preserved in formalin, with but little contraction. 
Locality Jamaica: Found in considerable abundance, growing on stones 
and coral rock, in shallow water, around the various Cays outside Kingston 
Harbour. The polyps are often partially embedded in sand and shore débris. 
Range.—St. Thomas, Guadaloupe (Lesueur; Duchassaing and Michelotti). 
